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| Tools & Home Improvement > Building Supplies > Heating & Cooling > Heaters & Accessories |
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| Product Description Squirrel-cage style Duct BoosterÆ installs in ducts 5in. in diameter or more and in rectangular ducts at least 3 1/4in.Increases heated or cooled air flow to problem rooms up to 50%! Tjernlund Duct Booster Increases Heating and Cooling Power - 275 CFM: Amazon.com: Industrial & Scientific Shipping Weight: 8 pounds | ||||||||
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