Corr/Guard™ is a corrosion-resistant venting system for use as a condensing appliance vent. The vent is designed to resist the highly corrosive condensate that forms in the vents of high-efficiency appliances. It is manufactured using AL29-4C® superferritic stainless steel produced by Allegheny Ludlum. The vent may be installed with low clearances to combustibles. It is offered in both single- and double-wall models with a selection of pipe lengths and fittings. Metal-Fab, Inc., P.O. Box 1138, Wichita, KS 67201; 316-943-2351; 316-943-2717 (fax);