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| Best Seller  | Master Flow 10 in. x 4 in. to 6 in. 90-Degree Register Box The Master Flow 10 in. x 4 in. x 6 in. 90°Register Box creates a right-angle transition from round pipe or insulated flexible duct to an air register. This box is made of galvanized steel. It can be installed with sheet metal screws. It is suitable... more | go to store |
 | Master Flow 4 in. H X 16 in. W X 16 in. L Galvanized Mill Aluminum Undereave Vent Master Flow offers a full line of easy-to-install options for providing critical intake ventilation at the soffit or undereave portion of the roof. more | $29.11 $26.01 FREE shipping go to store |
| Best Seller  | Master Flow 26FY7X7X4 7 in. x 7 in. x 4 in. 26 Gauge Flue Wye Used to vent two appliances together where codes allow. Heavy duty construction meets most building codes for single wall use. Crimped branch pipe in the direction of airflow.26-Gauge steel construction Y branch allows air to flow easilyCrimped in the... more | go to store |
 | Master Flow 4 in. H X 18 in. W X 18.5 in. L Black Resin Roof Vent Master Flow resin square-top utility vent is designed for attic ventilation. The fully enclosed hood deters rodent and insect infiltration and leaf and pine needle clogging. more | $41.99 $38.54 FREE shipping go to store |
 | Master Flow 3-1/4 in. x 10 in. Rectangular Appliance Wall Vent The Master Flow 3-1/4 in. x 10 in. Rectangular Appliance Wall Vent is designed to fit most range hoods that will be vented outside through a wall. This heavy-duty wall vent is made of zinc-coated galvanized steel. This wall vent features a spring... more | FREE shipping go to store |
 | Master Flow 12 in. x 2-1/4 in. to 6 in. Universal Register Box This Master Flow 12 in. W x 2-1/4 in. L x 6 in. Dia Universal Register Box is ideal for creating a straight in-line transition from a round pipe to an air register. Insulate ductwork for system efficiency and comfort. Galvanized steel construction... more | FREE shipping go to store |
 | Master Flow NU26CP4X24-5PK 4 in. x 24 in. 26-Gauge Round Duct Pipe Heavy Gauge 4 in. Pipe is used to vent boilers furnaces and hot water heaters. Available in a variety of common lengths diameters and gauges to help make your next HVAC project a success. A simple snap lock design and sturdy galvanized steel... more | go to store |
 | Master Flow NU28CP4X24 4 in. x 24 in. 28-Gauge Round Duct Pipe Heavy Gauge 4 in. Pipe is used to vent boilers furnaces and hot water heaters. Available in a variety of common lengths diameters and gauges to help make your next HVAC project a success. A simple snap lock design and sturdy galvanized steel... more | go to store |
 | Master Flow 4 in. Fresh Air Vent FAV4 - New Master Flow Fresh Air Vents come with a built-in screen to prevent bird entry. They can be used to vent a combustion system or anywhere fresh air intake is needed. Constructed of galvanized steel. Built-in bird screen Sturdy galvanized steel... more | go to store |
 | Master Flow 4 in. Starting Collar Take Off The Master Flow 4 in. Starting Collar is suitable for most HVAC applications. It provides a transition from a flat surface like a plenum (made from metal ductboard or insulated) to round pipe or insulated flexible duct. It can be used with ductboard an... more | FREE shipping go to store |
 | Master Flow 4 in. Storm Collar This Master Flow 4 in. Storm Collar is made of galvanized steel and installs on a variety of roof pitches with sheet-metal screws. It helps protect against rain snow and debris. Adjustable for various roof pitches. Sturdy galvanized steel construction... more | FREE shipping go to store |
 | Master Flow 4 in. Round Duct Cap The Master Flow 4 in. Round Duct Cap also called a tee-cap or clean-out plug is constructed of galvanized steel for durability. The duct cap is used to terminate or block off a rectangular duct run in HVAC systems. It can be installed with sheet metal... more | FREE shipping go to store |
 | Master Flow WVA4BL Round Wall Vent 4 Black Each Highlights: Color : Black Diameter: 4 inch Material: galvanized steel. Type: Round Usage: For Outside Sidewall Termination of Kitchen Bath Fans Range Hoods Microwave Venting or Dryer Exhausts more | $50.10 $40.75 go to store |
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