I have researched this to death, and feel I am just paranoid. I have been dragging my feet on making purchases for my basement induction electric setup. Ventilation is my biggest concern as I don't want to pull fumes from other basement gas appliances. The kettle and vent location will be approximately 11 feet from my furnace and 13 feet from the water heater (both gas). My first questions is what cfm fan is really necessary just to remove the steam/evaporation/moisture of 1 to 1.5 gallons an hour? Seems If I can get the hood closer to the kettle it will reduce the need for more cfm. Additionally, is there any good documentation on air systems/backdrafting. I would be fine with cutting an intake air hole, or even an intake air with an inline ductblower (same cfm) to go over the kettle. I have a CO detector. Any thoughts are appreciated - I don't have a window in the room. There is a door about 10 feet away from the gas appliances (22+feet form the brewspaces I could open to let some air through.