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® Increaser, EIX Model, 4 in Size, 0.012 in Aluminum Alloy Inner and 0.018 in Galvanized Steel Outer, 6 in H x 5 in OD

• Used to increase the vent size
• A maximum of 4 steps of increase

• Catalog https://assets.unilogcorp.com/267/ITEM/DOC/AmeriVent_7VPH_Catalog.pdf
• Full Engineering Drawing https://assets.unilogcorp.com/267/ITEM/DOC/AmeriVent_3EIX6_Full_Engineering_Drawing.pdf
• Instruction/Installation Manual https://assets.unilogcorp.com/267/ITEM/DOC/AmeriVent_8RAL_Manual.pdf