cased frame

General

box mullion

The built-up mullion of a cased frame of a double-hung window; has hollow jambs containing the counterweights.

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boxing

1. A box-like enclosure or recess at the side of a window frame that receives a boxing shutter when the shutter is

General

box frame

1. A structural frame composed of cells which are side by side and/or in vertical tiers; the cross-walls act as

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