Glossary

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B

Balance
A mechanical device (normally spring-loaded) used in single- and double-hung windows as a means of counterbalancing the weight of the sash during opening and closing.
Bay window
An arrangement of three or more individual window units, attached so as to project from the building at various angles. In a three-unit bay, the center section is normally fixed, with the end panels operable as single-hung or casement windows.
Bead
A wood strip against which a swinging sash closes, as in a casement window. Also, a finishing trim at the sides and top of the frame to hold the sash, as in a fixed sash or a double-hung window. Also referred to as bead stop.
Blackbody
The ideal, perfect emitter and absorber of thermal radiation. It emits radiant energy at each wavelength at the maximum rate possible as a consequence of its temperature, and absorbs all incident radiance.
BOCA
Building Officials and Code Administrators.
Bottom rail
The bottom horizontal member of a window sash.
Bow window
A rounded bay window that projects from the wall in an arc shape, commonly consisting of five sashes.
Brick molding
A standard milled wood trim piece that covers the gap between the window frame and masonry.
Btu (B.T.U.)
An abbreviation for British Thermal Unit, the heat required to increase the temperature of one pound of water one degree Fahrenheit.