Metal-Fab Type B-Vent 4" x 4" x 4" Swivel Tee d21 With this app

With this app

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these doors require the separate purchase of the appropriately sized Monessen cabinet door frame

Metal-Fab Type B-Vent 4" x 4" x 4" Swivel Tee d21 With this appType B Gas Vent products are tested and listed to UL 441 for approved gas appliances and feature our innovative twist lock connection and locking tab, eliminating the need for sheet metal screws. Metal Fab Type B Gas Vent combines hemmed flues and casings that maximize product durability and reliability and minimize installation time. Designed for versatility, Metal Fab Type B Gas Vent products 3" 6" adapt to major competing brands and when installed