A lot of folks use a piece of copper tubing with one end positioned near the front of the propane heater and the other end of the tubing located outside to draw air directly from outside for the heater. Thus not burning up so much oxygen in the room.
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This is an interesting idea. So why does the oxygen enter the room, as opposed to being drawn out of the room? The warmth?
The flame consuming the oxygen draws more of it in is my understanding of it.
That makes sense. So positioning the opening of the copper tube to the flame of the heater will draw in and eat up the oxygen, and then I don't have to crack my door. This is a good idea. I might do this.
Yeah all the ones that I have seen come in from below the heater which probably ensures good airflow.