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branch duct

An air duct which branches from a main duct; at this point the main duct is reduced in cross-sectional area.

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brad

1. A small finishing nail, usually of the same thickness throughout, with a head that is almost flush with the sides or

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brace

1. A metal or wood member which is used to stiffen or support a structure; a strut which supports or fixes another

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box sill

A type of sill, 1 used in frame construction; a header joist, nailed to the ends of the floor joists, rests on

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