Tuesday, 19 July 2022

Quick Question: ERV with 6" OA and EA ducts but RA and SA are only 5" - is that ok?

Hello,

Sorry to bug but I basically discovered today that the ducts the ERV installer is installing are different sizes - 6" for outside air and exhaust air, and 5" for return air and supply air.

This seems really odd to me since the system should to be balanced, no?

I included a photo below. It's a Panasonic Intellibalance 100 Cold Climate (FV-10VEC2).

I tried calling the manufacturer (Panasonic) and the rep said he'd never heard of it being done and wasn't sure if it was an issue or not so I thought I'd ask some more experts :).

I also found out that the installer didn't bring a manometer - so I built a DIY one myself to try to quickly test things - which you can see in the photo too. The installer also seems to have thrown out the plug covers the first day they were here (this is now day 2) and they didn't fully insulate the outside and exhaust air pipes and said that the system didn't need to be balanced and so didn't installer dampers on the RA and SA... so... I guess I really don't trust the work they did and would love your opinion.

Name: 20220719_105035.jpg Views: 1 Size: 409.6 KB

Thanks so much,
Peter
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source https://hvac-talk.com/vbb/threads/2240907-Quick-Question-ERV-with-6-quot-OA-and-EA-ducts-but-RA-and-SA-are-only-5-quot-is-that-ok?goto=newpost

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