ok i know that the HRV is to exchange the heat from the warm stale air of bathrooms, kitchen and laundry with fresh cold intake air from outside of the house. But I'm not sure how the stale air from bathrooms, kitchen and laundry is exhausted through the HRV that is located in the basement, aren't kitchen exhaust hook fan and bathroom ceiling fans all duct directly to the outside of the house either through the vent on roof or the walls?