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Thanks, that was my interpretation of the manual.[:-thumbu]

It is a power Vented unit.

I'm installing a Sterling 75,000btu unit heater in my shop, what are CSA B149.1 requirements for clearances to windows. My vent will be approximately 12" away from the window going thru the wall than ending past the soffits. [:-hspin] Sterling says you can terminate 12" away for inputs exceeding 50,000btu's. My soffit is 16" wide plus 5" for eaves trough = 21" plus say 6" for distance past for good clearance than the end cap. Anyone see any issues with this., Thanks.