I am currently resarching on a project trying to find out what is the
single most used size of sidewall register and floor diffuser installed
1. Homes more than 30 years old
2. Homes less than 30 years old
4. any regional differences? (ex: East Coast vs the Mid-West)
Thanks for answering.
While I doubt you won't get anywhere on these questions, you could always
try contacting a major grill manufacture and ask what are there most popular
sizes. Try Ameriflow for starters.
Then try several associations within the HVAC trades (Google search). I
doubt there will be any real answers (the grill manufactures won't want this
info to fall into the hands of their competitors and the contractors
probably don't keep detailed records.
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