SMath Forum SMath Studio Samples Rectangular Duct Size Finding From Equivalent Diameter 1 Pages (1 items) Rectangular Duct Size Finding From Equivalent Diameter - A tool for table search and selection - Messages Go to last post #1 Posted: 5 years ago overlord 558 likes in 1,335 posts. Group: Moderator Simple tool for fan duct size calculation.fan_equivalent.sm (32 KiB) downloaded 138 time(s). 1 users liked this postfrapuano 5 years ago 1 Pages (1 items) New Posts No New Posts