I wish the instructions went step by step. I had to guess at some of it. The heater seems well-constructed and it works fine.
Very nice little direct vent heater for our "she shed." It heats the space well. We hooked up to a larger LP tank which is nice. It sticks away from the wall on the inside a bit more than expected (does not lie flush), but other than that, it's a tremendous little heater.