A-A-50468A, COMMERCIAL ITEM DESCRIPTION: GATE, BLAST, LOW PRESSURE, SHEET METAL PIPE SYSTEMS (29 MAR 1991) [NO S/S DOCUMENT]

A-A-50468A, COMMERCIAL ITEM DESCRIPTION: GATE, BLAST, LOW PRESSURE, SHEET METAL PIPE SYSTEMS (29 MAR 1991) [NO S/S DOCUMENT]., This CID covers metal blast gates designed for use in round, low pressure type, sheet metal air ducts.