Generalbox mullion admin / April 21, 2013 The built-up mullion of a cased frame of a double-hung window; has hollow jambs containing the counterweights.
Picboxing admin / April 21, 2013 1. A box-like enclosure or recess at the side of a window frame that receives a boxing shutter when the shutter is
Generalbox frame admin / April 21, 2013 1. A structural frame composed of cells which are side by side and/or in vertical tiers; the cross-walls act as