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Replacement window glossary letter "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.
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