DuraVent FasNSeal 3" x 4" 29-4C Stainless Steel Tapered Increaser btu17100 Rear Width 22"

Rear Width 22"

Secondary Air System: Creates a second combustion zone to enhance fuel efficiency and cleaner burning

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These Mirro-Flame End Panels work specifically for 46" Napoleon Ascent Linear fireplaces

DuraVent FasNSeal 3" x 4" 29-4C Stainless Steel Tapered Increaser btu17100 Rear Width 22"All 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