![]() Most support manufacturers have more than one size, and you can choose based upon your duct weight and the allowable PSI. You should know the allowable PSI for mechanical equipment based upon roof construction. Size can matter, because those feet turn “pounds into PSI”. Non-penetrating rooftop support systems use plastic or rubber feet to distribute duct weight. We see more ducts being put on single-ply flat roofs, and in those cases you want to minimize roof surface penetrations. You will still need to determine height and any hardware to restrain the duct. If you use curbs or equipment rails, these guidelines give you quantities and widths. Now that you know where you need to put your duct supports and how many you need, you can start figuring out the parts and pieces you need to make the supports. Remember, the real reason behind these span recommendations is to have no more than two transverse duct connections between a pair of supports, and that is unlikely to be the case there. If you are supporting 5’-0” lengths of rectangular duct and you have a span that is 10’-6”, you really don’t need to use two supports.
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