HeatFab announces a new single- and double-wall special gas vent system. SGV/DGV is a safe and reliable venting solution for category I, II, III, and IV gas appliances. This UL 1738/ULC S-636 listed special gas vent features a unique stainless-steel alloy featuring exceptional corrosion resistance and an easy-to-install connection system. Get HeatFab quality in an economical design. Contact: www.selkirkcorp.com.