GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Sizing HRV Ductwork

Jim Baerg | Posted in Mechanicals on

I’ve designed and installed a few HRVs but have always done it by the seat of my pants using rules of thumb and good practices.  I’ve read a lot but have never found an easy way to size ducts and fittings.  The one time we had a system tested by a certified tester, we found low flow in the Master Bathroom.
I understand that Manual D would be one approach to doing that sizing, but it seems like it has a steep learning curve.  Can you point me to any literature, software or websites that might help?
thanks,  Jim

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

  1. GBA Editor
    Kiley Jacques | | #1

    If you are able and willing to pay a consultant, Allison Bailes of Energy Vanguard is the go-to guy. At the very least, he could point you in the direction of software/resources.

  2. Kyle R | | #2

    I would checkout the chart at this Energy Vanguard link. https://www.energyvanguard.com/blog/best-velocity-moving-air-through-ducts/

    Keep the velocity below 400 ft/min. Try to limit the amount of elbows and look up the equivalent length of any other fitting you plan to use to make sure it’s not too ugly.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |