A
• AAMA (American Architectural Manufacturers Association) -
a window industry organization that establishes voluntary
standards and installation guidelines. www.aamanet.org
• Air Infiltration - The amount of air that
passes between a window frame and sash. A measure of the
rate of air-leakage around a window or door in the presence
of a specific pressure difference. It is expressed in units
of cubic feet per minute per square foot of frame area (cfm/sq
ft). Formerly expressed as cubic feet per minute per foot
of window perimeter length (cfm/ft) but not now in use. The
lower a window's air-leakage rating, the better its air tightness.
• Alliance to Save
Energy- The Alliance to Save Energy is a coalition
of prominent business, government, environmental and consumer
leaders who promote the efficient and clean use of energy
worldwide to benefit consumers, the environment, economy
and national security. www.ase.org
• Architectural Shapes - Specially shaped
windows such as rectangles, triangles, trapezoid, octagons,
pentagons, half-rounds, half rounds with extended legs, quarter-rounds,
quarter rounds with extended legs, circles, ovals, ellipses,
eyebrows, etc.
• Argon
Gas - A nontoxic, non-reactive, clear, and odorless
gas which is denser than air. In a sealed glass insulating
unit, air currents between the two panes of glazing carry
heat to the top of the unit and settle into cold pools at
the bottom. Filling the space with a less conductive, more
viscous, or slow-moving gas minimizes the convection currents
within the space, conduction through the gas is reduced,
and the overall transfer of heat between the inside and outside
is reduced.
Awning Window - The sash is hinged at the
top and opens outward for ventilation. The awning hinges
are concealed and give a smooth looking unit and provide
improved tamper resistance. The hinge is designed so the
sash drops down as it opens. The bottom edge of the sash
remains in approximately the same plane as the window sill.
Awning Operators detach from the sash so the sash can be
opened a full 90 degrees to both conform to egress codes
and allow washing from inside.
B
• Balance Covers - Covers the balance cavity
on the vertical heights above the bottom sash. This cavity holds
the coil-spring balance system inside the jamb.
• Balance Shoe - nylon hardware in hung window
jamb that connects the balance with the sash. The balance shoe
locks in place when the sash is tilted inward for cleaning
.•
Bay Window – A three window unit that projects out
from the wall of the home. The windows are commonly projected
at 30- or 45-degree angles.
• Beveled Exterior Frame - An angled exterior
frame that adds beauty and definition to the exterior of the window.
• Bow Window - A 3, 4, 5 or 6-lite configuration
where the windows are mulled at a 9 degree angle to create a projection
of a circular or arced appearance. Our custom bow shop can design
a bow window to special angles such as 10, 12, or 15 degree and
can alter the standard dimensions to meet the needs of your particular
home.
• Brick Mold - A type of external casing which
frames windows and doors. Exterior casing around window to cover
jambs and provide means for nailing during installation.
• BTU - British Thermal Unit -- a basic measurement
of heat. One BTU equals the amount of heat needed to raise one
pound of water 1 degree Fahrenheit. (0.454 kg) of water 1°F(0.56°C),
(1 Btu = 1,055 J).
• Building Envelope - All components of a building
that enclose conditioned space. Building envelope components separate
conditioned spaces from unconditioned spaces or from outside air
. For example, walls and doors between an unheated garage and a
living area are part of the building envelope; walls separating
an unheated garage from the outside are not.
• Butyl - A rubber material that seals the glass
to the spacer, creating an airtight and water-tight IG unit. Butyl
has very low permeability to air, gases and moisture and low glass
transition temperature. Butyl also offers resistance to aging and
to weathering from atmospheric exposure.
C
• Casement Window - A window with hinged on the right or left
side and opens outward for ventilation. Our casement window is designed so the
sash moves in from the hinge side allowing you to access and clean the exterior
glass from the inside of your home.
• Center of Glass (COG) -
U- and R-values measured at the center of the glass. COG’s should only be used
to compare the effect of different glazing types, not to compare total window
performance. Frame types can drastically affect overall window performance.
• Coil Balance – A constant force device for holding vertically
sliding sash in a double hung window in any position. The coil balance counterbalances
the weight of the sash..
• COMcheck -
DOE's Building Energy Codes Program is an information resource on national model
energy codes. They work with other government agencies, state and local jurisdictions,
national code organizations, and industry to promote stronger building energy
codes and help states adopt, implement, and enforce those codes. The Program
recognizes that energy codes maximize energy efficiency only when they are fully
embraced by users and supported through education, implementation, and enforcement.
Supports the ASHRAE/IES Standard 90.1-2001, 90.1-1999 and 90.1-1989, the 1998,
2000, 2001 and 2003 IECC, and many state-developed energy codes.
• Condensation Resistance Factor - A measure of the effectiveness
of a window or glazing system to reduce the potential for condensation. The higher
the condensation resistance factor, the more efficient the window and glazing
system.
• Conduction – The transfer of energy from one material to another
by direct contact.
• Heat Conduction - When there exists a temperature gradient
within a body, heat energy will flow from the region of high temperature to the
region of low temperature. This phenomenon is known as conduction heat transfer,
• Thermal Conduction -The heat which is exchanged
between objects at different temperatures can pass from the one to the other
by simple contact of material.
• Convection - Heat energy transfers between a solid and a fluid
when there is a temperature difference between the fluid and the solid. This
is known as "convection heat transfer".
• Cooling Degree Days - A unit, based on temperature difference
and time, used in estimating cooling energy consumption and specifying nominal
cooling load of a building in summer. For any one day, when the mean temperature
is more than 65°F (18°C), there are as many degree days as there are degrees
Fahrenheit (Celsius) difference in temperature between the mean temperature for
the day and 65°F (18°C). Annual cooling degree days (CDD) are the sum of the
degree days over a calendar year.
• CRF. Condensation Resistance Factor. An indication
of a window's ability to resist condensation. The higher the CRF,
the less likely condensation is to occur. Based on AAMA standard.
D
• Dead-air space - The space between the panes
of glass of an I.G. unit.
• Deadlite – A stationary non-operating window
or door.
• Desiccant - A material used to remove water
vapor from an insulating glass unit.
• Desiccated Topcoat –desiccant concentrated
in the top layer of Dura Seal™ provides rapid dew point suppression.
• Dew Point - The temperature at which water
vapor will condense on a substance. Temperature and relative
humidity will determine exact dew point.
• Double-Hung Window – Surber’s double-hung
window has two operable sashes which move vertically in the frame.
The two sashes are attached to balance shoes and are counter
balanced with a balance system and tilt inward for safe, easy
cleaning.
• Double-strength Glass - Glass with a thickness
of approximately 1/8".
• Dual-Durometer – A co-extruded material with
degrees of hardness. In a glazing bead, sash profile or stationary
frame, there is a softer flap that seals against the glass.
• DuraSeal™ -
DuraSeal’s patent pending design incorporates unique materials
and a breakthrough in continuous composite manufacturing processes.
This advanced technology offers a higher performance spacer system
at a competitive price. DuraSeal takes optimum advantage of laminates
and adhesives to reduce thermal conductivity while improving
surface and corner appearance over other warm edge spacers.
E
• Efficient
Window Collaborative - EWC provides
unbiased information on the benefits of energy-efficient windows,
descriptions of how they work, and recommendations for their
selection and use.
.
• Egress -BOCA 1996
o 1010.4 Emergency escape and rescue: Every sleeping room below the fourth story
in occupancies in Use Groups R and I- I shall have at least one operable window
or exterior door approved for emergency escape or rescue. Each emergency escape
and rescue window shall have a minimum net clear opening of 5.7 square feet (0.53
m'). The net clear opening shall be at least 24 inches (6 10 mm) in height and
at least 20 inches (508 mm) in width. The net clear opening dimensions shall
be obtained by the normal operation of the window from the inside. Where windows
are provided for emergency escape and rescue, the windows shall have the bottom
of the clear opening not more than 44 inches (1118 mm) above the floor. Bars,
grilles or screens placed over emergency escape windows shall be releasable or
removable from the inside without the use of a key, tool or force greater than
that which is required for normal operation of the window.
o Exceptions
o 1. The minimum net clear opening for grade floor windows shall be 5 square
feet (0.47 m2).
o 2. An outside window or an exterior door for emergency escape is not required
in buildings where the sleeping room is provided with a door to a corridor having
access to two remote exits in opposite directions.
o 3. An outside window or an exterior door for emergency escape is not required
in buildings equipped throughout with an automatic sprinkler system in accordance
with Section 906.2.1 or 906.2.2.
• ENERGY STAR® - ENERGY STAR® was introduced by the US Environmental
Protection Agency in 1992 as a voluntary labeling program designed to identify
and promote energy-efficient products, in order to reduce carbon dioxide emissions.
EPA partnered with the US Department of Energy in 1996 to promote the ENERGY
STAR® label, with each agency taking responsibility for particular product categories.
ENERGY STAR® has expanded to cover new homes, most of the buildings sector, residential
heating and cooling equipment, major appliances, office equipment, lighting,
consumer electronics, windows and doors. For more information visit ENERGY STAR®
website at www.energystar.gov .
There are four regions on the ENERGY STAR® map and each region has specific energy
performance requirements. Different glazing may be required to meet your specific
region criteria.
• EPDM Seals - Ethylene Propylene Diene Monomer - a weather
resistant synthetic rubber used to make flexible seals for windows and doors.
• Extension Jambs – 4 9/16" or 6 9/16" wood extension
jambs factory applied to a window. B.F. Rich Availability; Pre-primed paintable,
Stainable, Flex-type. Custom Extension Jamb depths are also available with some
restrictions.
• Extruded screen frame – A screen frame is processed through
a form or die.
• Extrusion - A window or door profile produced by forcing material
through a die.
F
• Fenestration - An architectural term referring
a product that fills an opening in the envelope of a building.
i.e. windows, doors and skylights
• Fin-Seal – A weather-stripping used to form
a weather-resistant seal around operable sash.
• Fixed Unit - A stationary window or door that
does not operate or open.
• Foam-Filling – Polyurethane foam filled frames
can improve overall window thermal performance and enhance condensation
resistance.
• Flankers - Are the windows that are at the
opposite ends of a mulled unit. In a five lite bow, the first
and fifth windows are called the flankers. In a bay window the
windows on each end are called flankers. In a picture window
combo unit, the windows on each side of the picture window are
called the flankers.
• Float glass - Glass formed by a process of
floating the material on a bed of molten metal. It produces a
high-optical-quality glass with parallel surfaces, without polishing
and grinding.
• Full Screen - A screen that covers the entire
area of a window that has the possibility of opening. Some models
come standard with full screens and some come standard with half
screens.
• Fusion-welded – A state-of-the-art welding
process that uses extreme heat and joins vinyl window materials
together by fusion. The result is the materials being joined
together as a one-piece unit. Fusion-welded windows provide great
protection against water and air infiltration and give great
strength to the unit assuring long term square-ness resulting
in a high performing product.
G
• Garden Window – A window with two trapezoid
operation vents and a slanted roof line with a fixed window as
a roof. B.F. Rich custom sizes these windows and it is constructed
with a 5/4" wood buck frame. Tempered glass shelves are
available as well as vinyl coated wire shelving.
• Gas
Fill – Filling the air space in insulating glass
with a less conductive, more viscous, or slow-moving gas minimizes
the convection currents within the space, conduction through
the gas is reduced, and the overall transfer of heat between
the inside and outside is reduced.
• Glass - transparent solid substance: a hard,
usually transparent substance is used for making such objects
as windows, bottles, and lenses. It is made by melting sand in
combination with other oxides such as lime or soda without crystallizing
them.
• Glazing, (X-Y) – An automated state-of-the-art
process of applying a bed of sealant to the window sash sealing
the sash to the glass.
• Glazing Bead - A bead of vinyl which snaps into
the frame or sash surrounding the edge of the glass and securing
it in place in conjunction with a bed sealant. This system allows
for easy glass replacement in the field which means in the event
of a broken window glass you do not have to replace the entire
window sash and/or frame.
• Grids, Grilles, Grilles Between the Glass (GBG’s)
- Decorative grids installed between the glass or applied on the
glass surface (SDL & STDL) creating the appearance of the glass
being divided. Available B.F. Rich grids; Standard 5/8" x
3/16", Optional: 3/8" x 3/8", 3/4" contour,
wood grain, v-groove cut glass, cathedral round top v-groove cut
glass, SDL (Simulated Divided Lite) and STDL (Simulated True Divided
Lite).
H
• Half Screen - A screen that covers the area
of a window with one sash open. Some models come standard with
half screens and some come standard with full screens. NOTE:
Screens are not made to prevent children from opening screens
and are not intended to be a retaining devise.
• Head - The horizontal top member of the main
frame. This is where the window information sticker would be
located.
• Headboard – A 5/4" birch or oak finished
wood, cut to fit the contour of a Bow, Bay or Garden window.
• Head Expander - A U-shaped extrusion supplied
at the width of the window and placed on the head. The head expander
is used to expand the height of the unit and fill the gap in
the opening between the window and the opening. The head expander
can also be very helpful if the opening has settled and is out
of level. The head expander is not a required accessory and in
many situations it does not need to be used.
• Heating
Degree Days - A unit, based upon temperature difference
and time, used in estimating fuel consumption and specifying nominal
heating load of a building in winter. For any one day, when the
mean temperature is less than 65°F (18°C), there exists as many
degree days as there are Fahrenheit degrees difference in temperature
between the mean temperature for the day and 65°F (18°C).
• Hopper Window - A single sash window that hinges
from the bottom of the sash and opens inward for ventilation. Typically
this window is used for basement window applications.
I-J
• I.G. Unit (Insulating Glass Unit) - A combination
of two or more panes of glass with sealed air space(s) between
panes – Double panes and triple panes. Also referred to as thermo
panes or sealed units
• Interior Wood Grain – An overlay applied to
the inside of a vinyl window to give an authentic maintenance free
pre-finished look of wood to your window.
• Interlocking Meeting Rail - A positive interlock
at the meeting rail which interlocks both sash for maximum air
infiltration protection.
• J-channel - Integral extension on the outside
of a new construction window that provide for the installation
of siding.
• Jamb - Vertical member of the main frame.
• Jamb Adjuster – An adjuster that is located
in the middle of a double hung window jamb height and is used to
adjust the tolerance of the window height jamb to the sash.
K-L
• Keeper Rail - The lower horizontal member
of the top sash of a double hung sash or the vertical member
of the out side sash of a slider where the lock-keeper is mounted.
• Kick-Lock -
A secondary locking and vent device used on patio doors.
• Knee Braces - Used to help support the weight
of a bay, bow or garden window. Garden windows over 80 united
inches automatically come with support knee braces. Knee braces
are required on bows and bays with on overhang of 8" or
more from the last supporting sill edge.
• Knock Down (K-D) – A window or door shipped
as a package to be assembled in the field.
• Krypton Gas -
An inert, colorless gas used instead of air in sealed spaces
between panes of glass in insulating glass units to increase
insulation. Krypton provides greater insulation properties than
Argon gas.
• Labeled - Windows, doors or materials to which
have been affixed a label, seal, symbol, or other identifying mark
of a nationally recognized testing laboratory, inspection agency,
or other organization concerned with product evaluation that maintains
periodic inspection of the production of the above-labeled items
and by whose label the manufacturer attests to compliance with
applicable nationally recognized standards.
• Laminated Glass - Laminated glass is considered a safety
glass and is made of two or more pieces of glass bonded together over a plastic
inter layer. If broken, glass fragments adhere to the plastic inter layer rather
than falling free and potentially causing injury.
• Lift Rail – An integral rail on the operating sash used
for opening and closing the sash. B.F. Rich windows have continuous lift rail
across the sash.
• Lite - A separately framed piece of glass in a window or
door. It is a term also used to describe grids within a sash for example; a
traditional double-hung window often has several lights divided by grids in
each sash. Such windows are described as six-over-six, eight-over-one, twelve-over-twelve,
etc., to indicate the number of lites in each sash.
• Lock Rail - The upper horizontal member of the bottom sash
of a double hung sash or the vertical member of the inside sash of a slider
where the cam-lock is mounted.
• Locking Screen – A half screen that covers the area of a
window with one sash open and has slide bolt type locks to keep the screen
in that correct position. NOTE: Locking screens are not made to prevent children
from opening screens and are not intended to be a retaining devise.
• Low "E" (Emissivity)
Glass - a transparent coating applied to a glass surface to separate
long wave (heat) energy and short wave (light) energy. The long wave is reflected
back to the heat source. The short wave is allowed to pass through the coating.
A special type of glass having a transparent material fused into its surface
which acts as a thermal mirror. When Low "E" glass is used in conjunction
with argon or krypton gas filling there is a synergistic effect that offers
a very efficient glazing.
M-N
• Maintenance –
What to look for and when on a window or door installation.
• Manufactured Size (MFS) – The exact manufactured
size of a window or door.
• Master Frame - The head, sill and jambs members
of a window.
• Measuring
Instructions - How to measure for standard replacement
window.
• Mechanically Fastened - Refers to the frame
and/or sashes which are fastened together with screws.
• Meeting Rails - The horizontal members of
a double hung or the vertical members of a slider sash that meet
when the sash are closed, thus meeting rails.
• Mesh - Fiberglass or aluminum fabric used
in screens.
• Mullion (U or H) – An extruded accessory used
for connecting multi-units together. The vertical or horizontal
divisions or joints between individual windows in a multiple
window unit.
• Multi-Chamber - Chambered spaces within the
sash and frame of the window which help to insulate and strengthen
the window.
• Multifamily - A multifamily building is a residential
building three stories or less in height that contains three or
more attached dwelling units. Multifamily buildings include apartments,
condominiums, townhouses, and row houses. Hotels and motels are
considered commercial rather than residential buildings.
• NFRC National Fenestration Rating Council – www.nfrc.org
•NASEO - National Association
of State Energy Officials
Issues of concern to NASEO include electric and gas utility, transportation,
buildings, research, economic development, environmental, energy efficiency,
renewable energy and other energy-related matters. www.naseo.org
• Night-Latch – Mounted on the interior surface of the out side
sash the mechanism stops the window in a partially open position for ventilation.
O-R
• Obscure Glass - mainly used for decoration,
diffusion, or privacy. The pattern is rolled into the hot glass
during glass manufacturing.
• Oriel – Also referred to as a Cottage Window.
A window with the meeting rail located off center of the frame.
Most oriels have a 2/5-3/5 or a 3/5-2/5 configuration. B.F. Rich
has the ability to custom locate an oriel meeting rail to align
with a current location. Some restrictions apply.
• Overall Projection - The greatest distance
from the inside edge of a bow, bay or garden window to the outer
most edge.
• Sill-Pan – A fabricated sill pan extrusion
which is fastened under new window or door to provide a water
tight installation.
• Patio door - A sliding glass door with safety
tempered glass which slides to open and close on adjustable tandem
rollers. Surber’s patio doors are available in 5’, 6’, 8’, 9’
and 12’ in 2 or 3 panel configurations.
• Picture Window – A stationary window. Picture
windows can be made as a direct-set or as a sash-in-frame design
• Projection – The distance a bow, bay or garden
window will project on the outside. Wall thickness is not included
in projection. Projection plus wall thickness equal Overall Projection.
• PVC - Poly Vinyl Chloride – Window and door
profiles in rigid frame and sash members.
• R-Value - Resistance a material has to heat
flow. The higher the R-value, the greater the resistance to heat
flow. R-Value can also be determined by using the number 1 divided
by the windows U-Value.
• Radiation - Wave energy transmitted directly
from one object to another through the atmosphere or through
transparent or translucent materials. The energy radiated is
transmitted, absorbed, reflected or a combination of all three.
Radiation heat transfer is concerned with the exchange of thermal
radiation energy between two or more bodies.
• REScheck -
DOE's Building Energy Codes Program is an information resource
on national model energy codes. They work with other government
agencies, state and local jurisdictions, national code organizations,
and industry to promote stronger building energy codes and help
states adopt, implement, and enforce those codes. The Program
recognizes that energy codes maximize energy efficiency only
when they are fully embraced by users and supported through education,
implementation, and enforcement. Supports the 1992, 1993, and
1995 MEC; the 1998, 2000 and 2003 IECC; and various state and
county energy codes.
• RECA - The Responsible Energy Codes Alliance
is a consortium of energy efficiency professionals, product and
equipment manufacturers, and trade associations. RECA works to
improve the energy efficiency of homes through greater use of
energy efficient practices and building products. www.reca-codes.org
• Rough Opening - The framed opening in a wall
into which a window or door unit is to be installed. A rough opening
is generally _" greater in width and height than the window
or door unit.
S
• Sash – The operating section of a double hung,
horizontal slider, casement, awning or hopper window.
• Sash Lock and Keeper - The mechanisms which
lock the window in the closed position and pull the sash together
for maximum seal.
• Sash Rail - The horizontal sections of the sash.
• Sash Stop – A snap in stop the jamb track that
limits the sash travel.
• Seat Board – A 5/4" birch, maple or oak
finished wood, cut to fit the contour of a Bow, Bay or Garden window.
• Self-Cleaning Glass - SunClean™ self-cleaning
glass is a coated glass product with photocatalytic and hydrophilic
properties that combine to result in windows that are easier to
clean. The durable, transparent coating on SunClean
self-cleaning glass is applied to hot glass during the formation
process making it an integral part of the outer glass surface.
• Shading Coefficient - The amount of solar energy
or heat that is transmitted through a particular glazing system.
It compares the effectiveness of specific glazing options to a
single pane of 1/8" double strength clear glass in its ability
to reduce solar heat gain. The shading coefficient of clear double
strength glass is 1.0. A standard insulated glass unit has a SC
value of about .87. The lower the shading coefficient, the lower
the solar heat gain
• Side Lites - Fixed units on either or both sides
of a door to light an entry way or vestibule. Units can be mulled
or joined to door units to give a more open appearance.
• Sill - The horizontal, bottom section of the
main frame.
• Sill Extension – A fixed or floating extrusion
that is attached or inserted to the bottom of the window to cover
the gap between the replacement window and the existing sloped
sill. The Sill extension is not a required accessory and is not
used in some applications. The use of sill extensions with horizontal
sliders requires wood blocking to support the weight of the sliding
sashes.
• Single Hung - A hung window in which the bottom
sash slides vertically and the top sash is stationary.
• Single-Strength Glass - Glass with a thickness
of approximately 3/32".
• Slider Window - Available in 2 lite or 3 lite
configurations. A slider window has sash that open and close horizontally.
There are lift-out sash which require the sash to be lifted out
to clean.
• Sloped Sill - This sill type allows for natural
water run-off to the exterior from the window sill.
• Solar Heat Gain Coefficient (SHGC) - SHGC
is the glazing's effectiveness in rejecting solar heat gain.
SHGC is part of a system for rating window performance used by
the National Fenestration Rating Council (NFRC). SHGC is gradually
replacing the older index, Shading Coefficient (SC), in product
literature and design standards. If you are using glass whose
performance is listed in terms of SC, you may convert to SHGC
by multiplying the SC value by 0.87.
• Sound Transmission - Sound Transmission loss is determined in a laboratory
using ASTM E90 as the method. The numerical derivative STC (Sound Transmission
Class) is calculated according to ASTM E 413. STC results are valid for indoor
applications only and bear little relationship to the tested samples effectiveness
in preventing exterior noise. OITC (Outdoor-Indoor Transmission Class) is a more
recent attempt to measure realistically sound transmission loss for exterior
applications. The testing is done according to ASTM E1425 and the numerical derivative
OITC is calculated to ASTM E 1332. The number for both classes is expressed in
decibels (dB). Differences in STC vs. OITC range from 2dB for monolithic glass
to 10 dB for an insulating glass unit 2 _" thick. OITC numbers are always
lower for glass or glazing applications, due to high transmission of certain
critical frequencies, such as bus or truck rumble.
• Spacer Subassembly –unique multi-component spacer which is
bendable yet incompressible and stable
• Spacer - Material used between two or more pieces of glass
to create an insulated glass unit. Surber’s uses "Warm Edge" spacer
system. For more information visit: www.truseal.com
• Swiggle® Seal - The original, all-in-one, flexible insulating
glass spacer technology. Introduced to the marketplace in 1979, Swiggle Seal
offered the industry a dramatic alternative to the conventional aluminum spacer
system. By containing its own spacer, sealant and desiccant, Swiggle allowed
the manufacturer to use one product to perform the job of several conventional
I.G. components. The first flexible I.G. spacer to be marketed as Warm Edge,
Swiggle Seal has been in use longer than any other Warm Edge spacer system. Swiggle
Seal reduces conductivity of the spacer by 75% compared to aluminum spacer bar,
offering superior thermal performance and durability qualities.
T
•Tape Glazing - Two-sided tape used to secure
and seal the glass to the sash.
• Tempered Glass - Glass that is strengthened
through the process of heating and then cooling the surfaces
rapidly. This process produces glass four times more impact resistant
than non tempered glass. When tempered glass breaks, it shatters
into small pieces to reduce hazard.
• Thermo Panes - A combination of two or more
panes of glass with sealed air space(s) between panes – Double
panes and triple panes. Also referred to as I.G.U. (Insulating
Glass Unit) or sealed units.
• Thermal Conductance - Time rate of heat flow
through a body (frequently per unit area) from one of its bounding
surfaces to the other for a unit temperature difference between
the two surfaces, under steady conditions (Btu/h × ft²× °F) [W/(m²
× K)].
• Thermal Resistance - Materials which have a
high thermal conductivity have, by definition, a low thermal resistance
- they are poor heat insulators. Conversely, materials with a low
thermal conductivity have a high thermal resistance - they are
good heat insulators. Good insulating materials have a high thermal
resistance. In fact, the ``R'' value quoted for insulation is the
thermal resistance (in British units).
• Thermal Transmittance (U) - The coefficient
of heat transmission (air to air). It is the time rate of heat
flow per unit area and unit temperature difference between the
warm-side and cold-side air films (Btu/h × ft² × °F) [W/(m² × K)].
The U-factor applies to combinations of different
materials used in series along the heat flowpath, single materials
that comprise a building section, cavity airspaces and surface
air films on both sides of a building element.
• Tilt Latch – A mechanism that when depressed,
allows the sash it to tilt-in from the main frame for ease of cleaning.
• Tilt-In-Sash - A sash that can tilt-in to the
interior for cleaning.
• Tip-to-Tip - The actual measurement of the window.
• Transom - A small window that fits over the top of a door or window,
primarily for additional light, added ventilation or aesthetic value.
U - Z
• United Inches - The sum total of one window
width and one window height expressed in inches.
• U-Value - Amount of heat transferred through a material. The lower
the U-value, the slower the rate of heat flow and the better the insulating quality.
U-Value can also be determined by using the number 1 divided by the windows R-Value.
• UV % Transmission - The percent of ultraviolet rays transmitted
through the glass area of a window or door. Single clear glass offers a UV Transmission
of 73%. Low E glasses and tinted glasses can provide protection as low as 15%.
(Calculations using LBL Window 4.1)
• Visible Light Transmittance - The percentage of visible light
that is transmitted through glazing. (380 to 760 nanometers) The higher the number
the more light that is transmitted through the glazing.
• Wall Thickness – Also referred to as jamb depth; The distance from
the inner most edge of a bow, bay or garden window to the point where the window
projection begins..
• Warm Edge Spacer - Insulating spacers used to seal panes of
glass in the manufacture of insulated glass units -- edge conductivity is lessened
for improved window energy performance and reduces glass condensation.
• Warranty Surber’s Lifetime
Non-Prorated Warranty.
• Weep-Hole Covers - A cover that shields a weep hole with a
flap or dome while allowing water to drainage providing protection against back
drafts of air and keeping insects out.
• Weep-Holes – Internal drainage systems designed to allow for
water drainage to the exterior of the window so the windows chambers do not hold
the water.
• Wet Glazing - A silicone-based substance used to secure and
seal the glass to the sash.
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