That is a good question about the drywall ? I have a installer doing the work and I ran the bracket idea by him . It would be real easy to pull the top board and slip two sheets of drywall back there.The OSB board is practical but probably even more so if you put a fire retardant paint on it, near the furnace I would add a layer of drywall, city fire codes probably required that an 18 inches of clearance. Shop looks good
I was wanting the unit up off the floor and needed two sides or one side and the bottom opened for air. Duct work will be done first of the week so I will find out then.
All else fails read the instructios. It reads Do not install on combustible materials other than wood flooring. I texted my installer and he said he would use gas soaked rags ? Guess the novice questions are getting to him ?
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