I'm finishing up a 30x42 garage/shop and am considering using one or two ventless, wall mounted natural gas heaters. Anybody got experience with these? Is it dangerous to mount these in an area where flammables are present? There is no pilot - they ignite with a piezo? button--like a gas grill.
Also, I'm trying to decide how to finish the 12' ceiling. 1/4"OSB? Drywall? or?