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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
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1 Answer

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

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