Moving from exhaust-only to an HRV – outside venting question
Hi all, appreciate any help you can give.
I live in Minnesota (6B on the climate map) and I have a 3 year old house with bath fan exhaust only. There are 3 bath fans on the second floor that run constantly. House is about 3800 sqft now and will be almost 5000 sqft when basement is finished.
I’m thinking about switching to a HRV while the basement drywall is still open and shutting down the bath fans. In mechanical room HVAC is high efficiency so plumbed intake and exhaust. There is a 6 inch flex fresh air in the mechanical room seemingly just for the water heater.
Can I grab the 6 inch fresh air for the intake to an HRV and then just run another exhaust? Or could I tee the fresh air to the HRV and leave part open to the mechanical room? Or will I need to run a separate intake and exhaust for the HRV and leave the open intake as-is?
Mechanical room is about 150 sqft and will be drywalled and have a door once basement is finished.