Calculate the duct size from the offset .I will calculate the channel length of the spiral duct and round duct .45 degrees from 45 degrees , 90 degrees from 45 degrees , I will calculate the size at 90 degrees from 90 degrees .Not only horizontal swing , you also calculated up and down swing .In addition to duct also , it might be used in the piping .If there is a demand and improvements it is accepted by review.The free version displays ads.No ad paid versionhttps://play.google.com/store/apps/d
etails?id=com.dfc.charge
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