Lincoln MKVIII efan is 18" I believe and pulls nearly 4000-5000cfm. That would be a good replacement setup.
New HD Chevy trucks I think have (2) 16" or 18" efans pulling 4-5,000cfm each.
New HD Chevy trucks I think have (2) 16" or 18" efans pulling 4-5,000cfm each.