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Thread: bath fan duct

  1. #1

    Default bath fan duct

    There are 3 types of metal sheets (that you roll into duct) available at Home Depot

    1) very thin aluminum
    2) galvanized
    3) thicker galvanized

    I chose #2. But then the Home Depot guy said I should have chosen #1. He said aluminum does not rust, galvanized duct will RUST...

    Is that true ???

  2. #2
    DIY scratch-pad engineer leejosepho's Avatar
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    Default

    Yes, steel can eventually rust when the galvanized treatment on its surface is somehow compromised. Hence, and especially in a damp application, the aluminum duct will outlast the galvanized-steel duct. Steel is better in a high-temperature application such as the venting for a gas furnace or water heater, but aluminum is preferable for damp applications such as dryer and bathroom vents.

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