DuraVent FasNSeal W2 4" 88 Degree 316L Stainless Steel Double Wall Elbow d75 Brand DuraVent Series FasNSeal Flex h39.875 1400R - RM2 - NG - TMI - G9T - F11 - TI 25 Installation Type Post Maximum BTU:290000 BTU/hr
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DuraVent FasNSeal W2 4" 88 Degree 316L Stainless Steel Double Wall Elbow d75 Brand DuraVent Series FasNSeal Flex h39.875 1400R RM2 NG TMI G9T F11 TI 25 Installation Type Post Maximum BTU:290000 BTU hr Brand DuraVent Series FasNSeal Flex Model 9FSFLEX 110 Product Type Flex Length (Custom) it depends on the models being compared