DuraVent FasNSeal W2 5" 29-4C Stainless Steel Adjustable Double Wall Vent Length h37.875 How do I know whether

How do I know whether I need ember protection or thermal protection

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or coastal style

Stock Code 18261 Size 48

Framing Width 45-7/8" Framing Height 41-1/4" Framing Depth 18-1/2" BTU 35

DuraVent FasNSeal W2 5" 29-4C Stainless Steel Adjustable Double Wall Vent Length h37.875 How do I know whetherFasNSeal W2 (double 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