
Features Size: 4" x 12" Type "B" gas vent OD = ID + 1/2" Max installed length 10-1/2", min. 3-1/2" Aluminum inner wall, galvanized outer wall For gravity draft venting of LP or natural gas appliances 100 million BTU/hr. max. , 500 degree max. Not for wall furnaces Specifications Dimension: 5" H x 9.7" W x 12.5" L Weight: 3 lbs
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