DuraVent DuraFlex 3" Stainless Steel Tee With Cap shelf They are normally needed unless

They are normally needed unless the appliance is already inserted into an enclosure (for instance

Model FAW55IPXNAT Cabinet and Front Panels Color Beige BTU Input 55

Model 6SWI8

it is a design element

Use with Square Horizontal Cap only

DuraVent DuraFlex 3" Stainless Steel Tee With Cap shelf They are normally needed unlessDuraFlex Pro DuraFlex Pro is the ultimate in flexible steel liners for strength and flexibility. It features 20% more stainless steel per foot compared to other liners on the market. Its extreme flexibility facilitates problem free installations where multiple offsets are needed. DuraFlex Pro is available in 3 through 12 diameters in lengths, kits and custom lengths. DuraFlex Pro is manufactured utilizing highly corrosion resistant 316 Stainless