No. You should have outside combustion air coming into the room (assuming that it's not a very large room - don't make me look up the formula, I'm sure it isn't that big a room). 10 sq in high & 10 sq in low openings for outside air per 100K BTU. That air should not come from a garage (where cars are parked), outside is best.

You run the risk of making carbon monoxide.