MF8TGS18

TempGuard Max is the only all-fuel chimney that is UL Listed for 1-1/2 inch clearance to combustibles on 6 inch-8 inch diameters. 6 inch diameters tested by Underwriters Laboratories to UL Standard 103 HT 2100deg. (1700deg intermittant; 1000 degree continuous). OD is 3 inch larger the ID. For gas vents in the house or in a chase.