Exhaust Pipe Thimble Heavy Duty Custom NFPA

CONTACT FOR CUSTOM QUOTE! WE CAN BUILD TO YOUR SPECIFICATIONS
This thimble is 4" inner Pipe, 13" Outer Pipe, for penetrating 9" concrete wall. Overall length 27", Carbon Steel.
Perfect for routing exhaust through walls and ceilings. Available in 2"-10". Let us know which size you need for quote. Exhaust pipe thimbles are used where engine exhaust pipes penetrate through walls or roofs. The thimble provides an air gap between the hot exhaust pipe and the building structure. When exhaust pipes penetrate through combustible walls or roofs, thimbles are required by NFPA 37. Thimbles can be furnished with thermal insulation, designed to accommodate roof pitch, and may be constructed in various grades of steel or stainless steel.