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What types of material, other than drywall, are acceptable by Ohio HVAC Code for the ceiling of a small furnace room which will:

  1. Have return air ducts (only) passing through it to attic space.
  2. Butt up against a brick chimney on one edge (B-Vent installed in the flue)
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What materials are you considering? Fiber drop ceiling? Brick? Concrete? Wood paneling? –  wallyk Aug 21 '13 at 17:00
    
No idea about your local code, but cement-board (tile backer - 3x5x1/2" sheets) is a pretty decent material. Then again, two layers of 5/8 type X drywall with the joints in both layers mudded is a standard fire-rated covering... –  Ecnerwal Nov 20 '13 at 4:21
    
This probably depends in part on the furnace. My high-efficiency condensing furnace (installed a few years ago) is certified to be installed right against flammables (or have flammables installed right against it). ... If you need state codes, I'd suggest asking your town's inspector rather than a global website. –  keshlam Jul 18 at 1:48
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1 Answer 1

Paint it black, use left over wood flooring, plywood is fine too.

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