I am looking at installing a propane Water Heater. It will live in a crawlspace about 5 feet high. It is a 40 Gal, 36K BTU unit that is NOT direct vent. I will be right next to an outside wall with no windows or doors on that side of the house.
This is a small basement type area where the water pump, furnace and Water Heater live. I have recently replaced the fuel oil furnace with a propane direct vent and am now replacing the electric heater that replaced the fuel oil water heater this spring. I can't access the chimney because of new ducting.
I am wondering if I can use the 3" vent pipe and go through the rim joist and install a cap on the out side. this would include the elbow coming off the heater a straight run of pipe (pitched upward) through the joist, and elbow outside then a cap.
I wonder if the heat would be too much for the rim joist it goes through or the floor and floor joist it will be next to (3") from floor.
BTW we have no local codes except for the national codes and no permit necessary. Sorry for being wordy just want to explain the situation clearly.