Power vent heats still draw air from the interior. Think of the vent as an exhaust. Newer power vents use 2" PVC for venting and are quite easy to install in most cases. There is no discernible odor from the vent. I vent my furnace and water heater within 2 feet of each other, and I have never had any odor. I use the GE/Rheem heater, and have had very good luck with it. The Bradford-White is another very good brand.