bath fan duct

Discussion in 'Shower & Bathtub Forum & Blog' started by mf915, Mar 3, 2007.

  1. mf915

    mf915 New Member

    Nov 3, 2006
    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. leejosepho

    leejosepho DIY scratch-pad engineer

    Nov 23, 2006
    disabled-retired industrial fabricator
    200 miles south of Little Rock
    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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