Energy and heat recovery ventilators supply fresh, filtered outdoor air while simultaneously exhausting stale, moist air from spaces. They exchange heat between incoming and outgoing airflows through simple heat exchanger technology without mixing the air to help maintain the indoor temperature, minimize heating or cooling energy, and improve air quality.

Best practice for air quality would use a central heat recovery ventilator (HRV) or energy recovery ventilator (ERV) with ducts to supply air to living areas and bedrooms and exhaust air from bathrooms, laundry rooms or other spaces. However, ductless point source ERVs can be used in individual rooms and may be a good solution for studio units or small apartments, or any space in a home that can't be served by ducts.

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Comments (8)

In the past we have used TWIN FRESH RA1-50-2, Lunos (I cant find the spec. Fantech, and Panasonic Whisper comfort. The twin fresh had an ugly cord (plugs into an outlet.) the Lunos...Ill have to ask JOhn what his complaints were. WE used this bath fan - LUNOS RA-15-60 because we needed one that goes through the wall and john found it very frustrating and said it did not meet code. (again, I'll ask him) The Panasonic - so far so good except the wall had to be furred out...creates a bump in the wall...and it takes up a lot of space. It is not obvious from the sell sheet or a quick read of the manual. We installed a Fantech ERV on one project with supplies and returns in different rooms. It was installed by an HVAC contractor who had to be talked out of using the heating ducts & registers. I believe it works fine. I will check in with the owner and see what they have to say about all of them.

Its nice that one unit can cycle through intake and exhaust. Here are photos of the Panasonic whisper comfort installed. I'm sure with a thorough read of the installation guide we would have known how much space it requires and the wall furring needed, but there wasn't time/ budget for that on this project, and it is not obvious) so it came as a surprise and the furring is not architecturally great.

I assume there was no appropriate dropped ceiling in which to place the fan (in order to have more depth and avoid the furring req'd for the wall install)? Also, would it be possible to install near the end of a partition wall to keep ducts out of the exterior insulated wall, then just have the low end of duct penetrate the insulated wall? Can't tell from the pic if the lower joint is perfectly round to allow you to rotate the elbow 90º.

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