I'm considering purchasing a Peninsula direct vent gas fireplace to install in my new home. Planning on venting it horizontally through the back of the house but it would be close to both a window and sliding door. Any idea what the code is for direct vent clearance to a window or door. The specific until I'm looking at is 39,000 BTU and would be installed in Ontario.

Thanks for any help, let me know if I've missed any other details.