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7 Apr 2014 Size 5" - Type B, Type B 2x4. Size 6" - Type B. Installation. & Assembly. Instructions. AMERIVENT GAS VENT AND ACCESSORIES ARE FOR 3 Jun 2015 AmeriVent Type B gas vent uses a double wall of metal pipe for insulation and safety. The inner pipe of reflecting aluminum heats quickly, containing the warm flue gases inside. The airspace between the inner and the outer pipes provides insulation against heat loss to keep the warmer flue gases on the rise. AmeriVent Type B gas vent uses a double wall of metal pipe for insulation and safety. The inner pipe of reflecting aluminum heats quickly, containing the warm flue gases inside. The airspace between the inner and the outer pipes provides insulation against heat loss to keep the warmer flue gases on the rise. AmeriVent Direct Vent materials, design, and this instruction manual have been . b. Frame in an opening, providing a 10?" square for 4" x 65/8" systems and Standard efficiency b-vent, high efficiency polypropylene, special gas vent for condensing, near-condensing, and .. A full set of installation instructions are supplied with caps and supports. *Denotes UL listing .. AmeriVent. 3" - 6". 7" - 8". 1/4".Amerivent® 3" Universal Male Adapter Class B Vent. Amerivent® offers top-quality venting solutions including Class B gas vent Installation Instructions. 16 Jan 2018 Amerivent® 4" Universal Female Adapter Class B Vent. Amerivent® offers top-quality venting solutions including Class B gas vent Installation Instructions.