How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
Can the flexible ducts under a mobile home be on the ground?
Saturday, November 21, 2020
No, ducts should not be on the ground. The HUD installation requirements [24CFR-3285.606(e)] for manufactured/mobile homes states that the ducts must be installed to manufacturer’s instructions and “ducts must be suspended or supported above the ground by straps or other means that are spaced at a maximum distance not to exceed 4′-0″ or as otherwise permitted by the installation instructions. When straps are used to support a flexible type duct, the straps must be at least 1/2″ wider than the spacing of the metal spirals encasing the duct. The ducts must be installed such that the straps cannot slip between any two spirals and arranged under the floor to prevent compression or kinking in any location."
Also, here’s several other recommendations from the State of Florida’s installation course for manufactured home installers:
- Ducts may be supported by straps or pads.
- Use long bends to avoid kinks that restrict air flow.
- Limit length of duct to avoid BTU loss.
- All ductwork connections, including duct collars, must be sealed to prevent air leakage.
- If metal straps are used, they must be secured with galvanized sheet metal screws.
The photo above shows an example of how not to do it.
Also, see our blog posts Is it safe to go under a mobile home? and What size air conditioner is right for my mobile home?
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