Selkirk 4" Diameter Adjustable Wall Thimble, Aluminum Type B Gas Vent, 187704

Upgrade your venting system with the reliable performance and safety of Selkirk’s double-wall gas vent wall thimble, designed to deliver exceptional durability and efficiency for residential, industrial, and light commercial applications. The type B gas vent wall thimble serves as a firestop as well, for added versatility. It's engineered with an inner aluminum liner and a galvanized steel exterior that provides superior protection against harsh outdoor elements, which extends the life of your venting solution. Installation is made simple. The wall thimble adjusts from 4 - 1/8" to 7" to fit the thickness of your wall and provides the required 1-inch air space to combustibles when installed according to manufacturer specifications. With a 1-inch clearance to combustibles, this vent system offers both safety and performance, ensuring peace of mind for every installation. For nearly a century, Selkirk has been a leader in HVAC innovation, offering products that meet and exceed rigorous UL safety standards. Every vent is engineered to deliver long-lasting reliability, efficient performance, and unmatched durability. Built for professionals and homeowners alike, Selkirk gas venting solutions combine advanced engineering with simple installation, making them the trusted choice for those who refuse to compromise on safety or quality.