Duct sizing for ERV
We are about to install a Broan 180 AI ERV in our home. I have spent a lot of time researching and thinking about how to go about this. This is my most recent duct layout and I was hoping to run it past people who know more than I do. My main questions-
1. Is an 8″ trunk line for supply and return a good choice?
2. I am planning on reducing the blue supply line down to 7″ and then 6″ for the branches with 6″ flex pipe to the registers. The return line (red) is 8″ trunk and 6″ branches, mostly flex pipe.
3. Do I have to make the outside supply and return 8″ instead of 6″ if the main trunk is 8″?
4. Anything look drastically wrong or could be improved?
I have attached my layout for reference. The ERV is located in the laundry room and will be ducted up to attic. The ducts will be rigid ducting wrapped with insulation and under blown in. Zone 6. Thanks!
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