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DuraBreeze Duct Defender 4. The powers of carbon and fine-mesh netting combine in the 8-inch DuraBreezeÃÂ® Duct Defender to create a strong defense for duct systems against pesky bugs and mold, mildew and unpleasant odors. Use the simple Velcro tabs to attach it to the fan intake system to prevent pests from getting in, or affix it to the fan exhaust system to keep unpleasant odors from getting out. Replacement carbon filter inserts are available separately. DuraBreeze Duct Defender 4