Upgrade your microwave ventilation systems effortlessly with this 4 inch galvanized steel duct change set , featuring a secure rectangular to round design, included gloves, and adhesive tape for leak installation. Crafted from strong galvanized stainless steel, this compact 3 1/4"x10" to 4" circular duct adapter ensures rust resistant , space efficiency, and seamless compatibility with exhaust fans or dryer vent covers. Ideal for homeowners, enthusiasts, and contractors seeking to optimize airflows in kitchens, laundry rooms, or spaces requiring stable ventilation systems upgrades. Perfect for retrofitting existing ducts in residential or commercial settings, this change set maintains air circulation integrity while resisting weather exposure in outdoor or high humidity environments. Engineered with accuracy folded edges and reinforced seams, this ventilation essential secure long term durability, minimizing maintenance needs even under continuous sun or rain exposure.