Ductwork is measured in linear feet of each size but the unit in the database is pounds. How can we convert?
Reference number R15810-050 Ductwork gives a very quick but crude table for estimating pounds of duct for aluminum, copper and steel. However, if you wish to be much more accurate for steel fabricated duct Table R15810-100 Sheet Metal Calculator (Weight in lb./ft. of Length) is the table to use. This table is predicated on the old SMACNA semi-perimeter method of fabricating dust. This method is no longer used for fabricating, however, it still seems to be the preferred method of estimating and the resulting accuracy is within acceptable limits.
