Product HighlightsMetal-Fab's round and oval Type-B vent is listed by Underwriters Laboratories for use with approved category 1 gas furnaces, heaters, and boilers. A category 1 appliance operates with a non-positive vent static pressure. The double wall design of B-vent enables the product to be used in homes and commercial buildings at close clearance to combustible. Metal-Fab's B-vent design incorporates features that make installation quick, easy, and safe. Some of those features are:
- Elimination of sharp edges by hemming the flue and casing.
- Assembly & disassembly, without tools, using positive twist lock.
- 360 degree rotation of small diameter fittings using swivel tees, wyes, and elbows.
- Space savings inside standard stud walls using oval pipe.
California residents: see Proposition 65 Warning
Weight 0.30 Pounds Length 10.50 Inches Width 10.50 Inches Height 5.00 Inches Country of Origin USA Brand Metal-Fab Diameter 3" - 4" Composition Outer wall is constructed of galvanized steel .018" thinck G90 Steel for sizes 3" to 14" diameter and .024" think G90 for sizes 16" to 30" diameter. The inner wall is constructed of aluminum alloy .012" think for sizes 3" to 8" diameter and .018" thick f Connection Size 3" to 4" Gauge Outer Wall - 26ga, Inner Wall - 30ga Inside Diameter 3" UL Listed Yes
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