As a way to do a takeoff, you will have to have the option to be familiar with what rectangular duct and fittings appear like And the way They're represented on the drawings. Jul nine, 2017 #23 I have not observed plaster laid right on to block do the job, https://roundconduit02233.onzeblog.com/36738615/an-unbiased-view-of-oval-conduit