Metal-Fab 4MOFS - Type-B Gas Vent Oval Firestop Spacer - 4"

Metal-Fab is the only B-Vent manufacturer with UL approval to connect the male end into the female end of all competitive UL listed B-Vent brands, increasing product versatility. Did you know that by simply connecting using three (3) quarter inch sheet metal screws to secure creates a UL listed connection?

Metal-Fab 4MOFS - Type B Gas Vent Oval Firestop Spacer - 4"

The Metal-Fab 4MOFS is a 4-inch oval firestop spacer designed for use with Type B gas vent systems. It provides the required firestop and clearance to combustibles when the vent passes through a wall, floor, or ceiling. Built to fit standard 2x4 stud walls, this spacer centers and secures the oval vent pipe while maintaining proper clearances. It’s constructed from durable galvanized steel and aluminum materials, ensuring long-lasting performance and compliance with UL 441 standards for gas venting systems.

Features

• Manufacturer: Metal-Fab
• Part Number: 4MOFS
• Type: Type B Gas Vent Oval Firestop Spacer
• Material: Galvanized steel outer wall, aluminum inner wall
• Vent Size: 4 inch (oval)
• Application: Provides firestop and clearance through walls, floors, or ceilings
• Design: Fits standard 2x4 stud wall framing (16" on center)
• Clearance to Combustibles: 1 inch minimum
• Listing: UL 441 certified for Type B gas vent systems
• Additional Features: Centers oval vent and maintains system integrity for safe venting

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