Air exchanger prior to air sealing
I live in a late 80’s home that was at ACH 3.12 when we bought it two years ago. We already did some additional air sealing when changing our rear windows. I just realized our current air exchanger is rather useless as it’s one big flex duct going to the attic and pulling stale air from the hallway with no ducting to provide fresh air.
I am looking at doing a clean install of an ERV with its own ducting system before we do any further air sealing. I live in climate zone 6. Our house is approximately 2800 sqf on two floors without basement and we are 3 in the house.
As to the questions:
1) Should the ERV be ducted with rigid ducts? Or is there a more appropriate ducting system for ERVs?
Also, we have a bathroom renovation – secondary bathroom – and need to install an exhaust fan. I was thinking of having it connected to the air exchanger, but our contractor suggested against it. He seemed to genuinely believe it was an inferior solution. Do you suggest I have the bathroom fitted with an exhaust fan or to connect it with the air exchanger?
Lastly, I also need to replace our bathroom fan in main bathroom, do you think it best to replace it with an exhaust fan or to connect it to the air exchanger as well?
I’ve met 5 and none recommended what is promoted here: a balanced system with its own set of ducts, which makes me hesitant to trust what they tell me. There aren’t many companies left to meet which leads me to believe I’ll need to know everything there is to make things are done well…
Thank you for your help and insights!
GBA Detail Library
A collection of one thousand construction details organized by climate and house part