DuraVent FasNSeal 3" 29-4C Stainless Steel Wall Thimble Sleeve Extension sqft1808 Made of high-toughness MDF board

Made of high-toughness MDF board which is not easy to deform

Mantel Base

Acts as a weather and pest barrier

5" (B) x 8

DuraVent FasNSeal 3" 29-4C Stainless Steel Wall Thimble Sleeve Extension sqft1808 Made of high-toughness MDF boardAll FasNSeal (single wall) vent lengths and components feature patented built in mechanical locking band and triple lipped directional gaskets. All pipes and components are engineered with smooth clean welds located 90 from mechanical locking bands. This construction feature allows for ease of installation. The air space between the inner and outer wall on FasNSeal W2 helps to reduce the clearance to combustibles in addition to creating a heat shield