DuraVent FasNSeal W2 7" 30 Degree 316L Stainless Steel Double Wall Elbow w13.4 you can achieve an R-Value

you can achieve an R-Value of up to R=10

Brand American Gas Lamp Works Model Cavalier Model Number 1400H Product Type Lamp Lamp Type Residential Fuel Type Natural Gas Width 13

clean louver design

Note: It is recommended to place the two sides at an angle among 35 to 45 degrees for better propping support

Size G H Kenwood B 9-3/4" 5"

DuraVent FasNSeal W2 7" 30 Degree 316L Stainless Steel Double Wall Elbow w13.4 you can achieve an R-ValueFasNSeal 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