Q. Last year we installed an air exchanger, and ever since we smell bacon in the basement when cooking breakfast. The basement door is not near the kitchen and we don’t know why this happens. L.M. A. Sounds like the installer was not familiar with the minimum distance required between the exhaust and intake vents on the outside of the house. The vents should be at least 1,800 mm apart to prevent re-entry of exhausted air. Check the location of …