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PoorUB Building is constructed very well - 2 inches of core-bond with bat insulation on top. inside 2x6 walls and 2x10 truss top chord. I appreciate your input on BTU sizing. thanks!

Thanks for the replies very much appreciated -- typo on BTUs :) should've been a 4 ....40ish per foot. Bldg is only 32x40 with 20 ft lid and 3 bay doors - I'll be working with epoxies and laquers which require consistent heat so I'm overestimating on BTUs. Making more sense now -- as you can...

Need some help trying to figure out a shop unit heater - separated combustion. My sq footage and ceiling height calcs BTUs at 60ish per foot. I'm in Montana and with 3 bay doors I lean on the higher side although shop is well insulated. The issue I'm having is with rise. The rise on popular...