These are excellent quality back draft dampers. They are made from heavy-gauge galvanized steel with heavy duty springs. They use both an embossed bead & rubber gasket to help keep ducting securely in place. They prevent back draft air when your fans are off.
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Why? Everyone claims they have the lowest prices, best selection and are the most knowledgeable. But we guarantee it! We founded this company with over 28 years of hydroponic and indoor gardening experience. We opened up our hydroponic farm in 1996...