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Glossary Terms
 
Argon Gas
An odorless, colorless, tasteless, non-toxic gas which is six times more dense than air. It is used to replace air between the glass panes to reduce temperature transfer between the outside and inside pane of glass.
Beveled Exterior
An angled extension from the frame that adds an aesthetically-pleasing dimension to the exterior of the window.
Coved Exterior
An arced extension from the frame that adds an aesthetically-pleasing dimension to the exterior of the window.
Double-Strength Glass
Glass with a thickness of approximately 1/8". Stronger glass helps against stress fractures.
Egress
A place or means of going out.
Fenestration
Any opening in a building's envelope including windows, doors, and skylights.
Fusion Welded
The process of joining materials by melting them together with extreme heat (over 500°F), resulting in the materials uniting into a one-piece unit.
Glazing Bead
A strip of vinyl which surrounds the edge of the glass holding it in place in the sash.
Jamb
Vertical sections of the main frame.
Lift Rail
A continuous handhold along the sash for raising and lowering the sash.
Pull Rail
A continuous handhold along the sash for sliding the sash back and forth.
Solar Heat Gain Coefficient (SHGC)
SHGC measures how well a product blocks heat caused by sunlight. The lower the window's solar heat gain coefficient, the less solar heat it transmits.
Tape Glazing
Two-sided tape used to secure and seal the glass to the sash.
U-Factor
U-factor measures how well a product prevents heat from escaping. The lower the U-value, the slower the rate of heat flow and the better the insulating quality.
Visible Transmittance (VT)
VT measures how much light comes through a product. The higher the VT, the more light is transmitted.