This command lets you get the answers very close to what you would normally read off a common duct sizer.
This duct sizer is simple, easy to eval the flow CFM and calculate width or heigth ducts, and the checking of existing duct systems. Ducts can be sized using different methods: equal friction, constant velocity and static regain.
This function will allow you to create professional HVAC CAD drawings.
Duct Trazar Interface