Metal-Fab - MTF4M6AF - 4" B-Vent Female Adapter

Metal-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° Rotation Of Small Diameter Fittings Using Swivel Tees, Wyes, and Elbows.
• Space Savings Inside Standard Stud Walls Using Oval Pipe.

UL Listed To Mate with Other Specifically Identified and Listed Round Gas Vent, 3"-6" Diameters, Allowing You To Add A New Run Of Metal-Fab B-Vent To An Existing Run Of Common Vent. Metal-Fab 3"-6" Diameter B-Vent Pipe Is Now Standard with Our New Surelock B-Vent Locking System . The Patented Locking System Provides A Secure Lock with Just The Push Of A Tab, and Can Be Easily Disassembled By Pulling The Tab Back Out. Commercial Vent or "Big Vent" Is Available In Round Sizes Of 14" - 30". Big Vent Sections (In 16" - 30" Diameters) Are Joined Together Using Metal-Fab's Quick Connect Locking System.