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Airtight venting products allow for cleaner, stronger and more efficient venting systems. The patented Fusion Seam provides 5x better air flow than standard venting products and lasts longer than other thin, snap lock pipes. The 4 in. Galvanized Steel Vent Hood and Pipe is suitable for venting a dryer or bathroom. This fire resistant ventilation accessory is made from galvanized steel and features a positive-action damper that promotes optimum efficiency and keeps cold air and rain from entering the home. This product uses the proprietary Airtight technology to prevent air leakage and improve the efficiency of your appliances.