Schaefer has a full line of accessories as tough as the Americ VAF Series ventilators.Premium Ducting Extremely rugged and durable flame resistant ducting for demanding conditions and long life. Single ply PVC vinyl coated polyester fabric with 10 gage spring steel wire helix and external PVC wearstrip. UL 94V-O flame retardant (self-extinguishing); meets NFPA 701 standards.Standard Ducting Lower cost industry standard quality ducting for everyday use. Single ply PVC vinyl coated polyester fabric with 15-gage spring steel wire helix and external PVC wearstrip. PVC coated polyester fastening cuffs at both ends with industry standard spring buckle cinches. Flame resistant. Available in 8" (15' 25') 12" (15' 25') and 20" (25') sizes. Integrated carrying bags available with 8"x 25' 12"x 25' and 20"x 25' ducts.