Used to pass horizontally through a combustible wall, this wall pass-thru is adjustable for different wall thicknesses varying between 4" and 9". Galvalume steel outer cover plate is included. •Strong and durable venting thanks to its outer wall in galvalume steel and its inner wall in stainless steel •Revolutionary gasket system that prevents leaks and does not require the use of silicone •Smooth-weld technology for virtually invisible seams • Precision formed ends for a better finish •Complies with NFPA 211, CSA B365, UL 641, CAN/ULC S609 and ULC/ORD C441 standards **Dimensions** AØ : 5.75" BØ : 3.9" C : 9" D : 10.5" YY : 4"-9"