Precision Vent Quality Seal

AL 29-4C, Special Gas Vent


  • Tested and listed to UL1738 ‘Standard for Venting Systems for Gas-Burning Appliances, Categories II, III, and IV’.
  • AL29-4C can be used with Category I, II, III, and IV appliances only.
  • Sizing, system routing, system fittings, and required inner thickness must conform to appliance manufacturers guidelines. Detailed calculations and system assembly drawings must be submitted for approval.
  • AL29-4C inner liner, ½” or 1” air space, and 430 stainless steel outer jacket.

Diameters from 3″ through 36″ are available. We carry boot tees, adjustable pipe lengths, drains, drain tubing, sealant, and optional 0.025″ wall thickness (required for some larger BTU appliances). PV provides detailed sizing and system assembly drawings conforming to ANSI Z223.1, National Fuel Gas Code (NFPA 54), and appliance manufacturers’ requirements.

Most products are in stock for same day shipment when you order by 2:00pm EST!