The type B designation is assigned to gas venting systems that meet the safety requirements of Underwriters Laboratories, Inc. The AmeriVent all-metal, double-wall gas vent is listed as type B by UL and is approved for residential and commercial applications such as Category 1 water heaters, boilers, furnaces, space heaters, or wall heaters. UL-approved type B gas vent products form a continuous passageway from an approved gas appliance to the termination of the vent above the roof of the structure.

AmeriVent® Fire Stop Spacer, 0FS Model, 4 in Size, 0.018 in Galvanized Steel, 1-1/2 in L x 7-1/4 in W x 2 in H

• AmeriVent pipe are lightweight and rugged feature, made of corrosion-resistant galvanized steel and aluminum
• Ends have a snap-lock coupling
• 1 in minimum clearance to combustibles
• To disengage the locking tab - align the seams and pull apart
• Locking tab - to ensure a secure fit, push in the locking tab to lock the pipes together
• Engagement - snap-lock joints overlap - to calculate height deduct 1 in for each joint
• This centers the vent in 16 in OC stud space and serves as a firestop at the ceiling level
• A required component for type B 2 x 4 and multi-story type BW installations
• 2 x 4 in wall size

• Catalog https://assets.unilogcorp.com/267/ITEM/DOC/AmeriVent_40PS_Catalog.pdf
• Full Engineering Drawing https://assets.unilogcorp.com/267/ITEM/DOC/AmeriVent_40FS_Full_Engineering_Drawing.pdf
• Instruction/Installation Manual https://assets.unilogcorp.com/267/ITEM/DOC/AmeriVent_40FS_Instruction_Installation_Manual.pdf