ERV installed

Our HVAC contractor was busy at the site two weeks ago. He completed the install of the ERV unit in the basement. I hope he enjoyed the challenge. It was a tight space, but in the end everything fit fine.

The only casualty is our pantry area. We lost another few square feet to ducts. This is because we originally planned to run the exterior vents through the rim joist area, but later decided to move them up 4 feet from ground level to avoid snow accumulation issues in the winter. Moving them up higher meant penetrating the first floor space above the unit in the basement.

The unit is hung from the floor trusses above and flexible ducts connect the unit to the metal ducts in order to dampen the vibration from the unit. The unit itself is very quite, but we’re not moving to the country to listen to a ventilator.

The ducts to the exterior are insulated to R8. The pre-heat unit is installed close to the unit on the intake side. It is only used when the intake air is below 10 degrees F. It warms the incoming air just enough to prevent rotary lockout on the unit.

Click on the ventilation category on the right to learn more about how we chose this unit and why we’re using an ERV in the first place.

6 Responses to “ERV installed”

  1. 1 Gretchen 28-June-2011 at 8:37 am

    Is that interior dry wall?

    • 2 Larry 28-June-2011 at 9:32 am

      Good eye! But don’t get too excited yet. We had to put the sheetrock up before it was installed or we wouldn’t be able to reach behind afterwards. We’re still a ways from putting up more sheetrock.

  2. 3 Mary 28-June-2011 at 12:19 pm

    Hi, been following your blog – very educational. And congrats on all you’ve done! We’re breaking ground in 2 wks and planning an ERV. If you have a chance, I have some Q.

    Why is the ERV suspended instead of just sitting on the slab a few feet below?

    Have you tried it yet – I know the units are fairly quiet but I’m wondering if you hear a lot of noise in the ducts or at vents. Since it is on all the time that would bug me. But I know we’lll need to get one.

    Where do you ‘dump’ the fresh air (what room and where in the room).

    Thanks for much for your time.

    • 4 Larry 28-June-2011 at 1:37 pm

      Hi Mary. Thanks and congratulations on your impending ground breaking.

      Our specific unit needs to be accessible on 3 sides (top, front and bottom). So due to our orientation of the unit, it could be hung on the ceiling trusses or the wall. I thought it would be supported better from the ceiling than the wall.

      As for the noise, we’ve only tried it on boost mode, the loudest. You could hear it running, but we don’t have any sheetrock installed yet. So we won’t really know until we’re a little further along in the process.

      Fresh air is distributed to the living, dining, study and bedrooms, and exhausted from the kitchen, pantry and bathroom. In general you want to exhaust from the more humid rooms.

      Hope that answers your questions. Good luck with your house.

  3. 5 Robin 1-July-2011 at 8:46 am


    I have an ERV that I suspended from the joists and found it shook the house, Adding a spring suspension (4 springs from the hardware store, one on each of the 4 attachments) moderated it considerably. I can still hear it on boost mode…


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