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I replaced my old thermostat with a Nest E thermostat for my Big Maxx 50,000 btu. I am using four wires...R,W,G,and C. Nest says this is correct but the thermostat won’t power on. I checked the connections at and inside the the heater. They all seem correct. I tried searching the forums with no...

So with how my garage is laid out I really only have one option for heater placement, in a corner above a walk thru door. Can I horizontal vent about 4' above the door? I didn't see anything in my directions about venting above a door. The door is only used to access a kennel for my work K9...