Your small, hometown-attitude company Keith Specialty Store 6791 Rt 119 Hwy N, Marion Center, PA 15759 US callers: 800-705-8838 FAX: 724-397-2228 Outside the US: 724-397-8838 8:00am-6:00pm M-F, 8:00am-3:00pm Sat. (ET)
Double-wall stainless steel with insulation is rated triple wall
Metal-Fab vent pipe is double-walled with insulation in between, high temperature rated at 2100°F for all fuels. Both the inner and outer walls are stainless steel. The flashings and storm collars are aluminum.