National Stock Number: 4520-01-221-7150
Federal Supply Class: 4520
National Item Identification Number: 012217150
Description: DAMPER,FLUE
Detail: A CAST IRON OR SHEET METAL PLATE DESIGNED TO BE INSTALLED IN A BOILER, HEATER, STOVE, OR FURNACE FLUE PIPE TO CONTROL THE DRAFT, AND/OR IN AN AIR DUCT TO CONTROL THE PASSAGE OF AIR. EXCLUDES VALVE, BUTTERFLY.
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