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Designed for use with gas burning Category 1 appliances. Install with minimum 1" clearance to combustible material. Double wall construction with aluminum alloy inner flue and outer casing of galvanized steel or galvalume steel. Outside diameter is 1/4" greater for 3" thru 6" vent sizes and 1/2" greater on 7" thru 10" vent sizes. User friendly Surelock® Locking System on 3" thru 6" vent sizes pro- vides a secure lock with just a push of the tab, and can be easily disassembled by pulling the tab back out. Positive twist locking system on larger vent sizes for easy assembly and disassembly. Metal-Fab, type "B", "BigVent" is available from 14" thru 30" dia. (even sizes only), on special order. "BigVent" special orders are normally available to ship in 2 to 3 days from the factory.
Designed for use with gas burning Category 1 appliances. Install with minimum 1" clearance to combustible material. Double wall construction with aluminum alloy inner flue and outer casing of galvanized steel or galvalume steel. 4" oval fits 2" x 4" or 2" x 6" stud walls. 6" oval fits 2" x 6" stud wall.