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- 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.
- 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.
- 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.
- 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.