Selkirk 6 in. D Galvanized Steel Wall Thimble

The insulated wall thimble installs quickly and eliminates the need for using individual fire stops. Interior plate has black matte finish. The round shielding acts as a radiation shield and provides the required 2 inch airspace clearance to combustibles. The two sections telescope to accommodate 6 inch to 11 inch wall thickness. Assembled with the positive joint coupler, the safest and most secure locking system in the industry, ultra-temp and galva-temp chimney sections twist together with a 1/8 turn Engineered for safety, Selkirk, also known as metalbest or metalbestos, chimneys are packed with one inch of premium fiber insulation, ensuring a 100 percent fill