Flex Duct Support Inspection Gallery Internachiв Flex duct support: flex duct support. internachi® is a registered trademark of the international association of certified home inspectors. First time seeing this, 1 1 2 inch metal strap supporting flex duct. always have just seen the nylon strap before. irc refers to manufacturer’s specs but i am having a little trouble finding something. while i look further, i thought i could get a quick answer here. sorry for not havong a pic, but i have a new vista computer and have yet to figure out how to crop and resize. thanks in advance.
Proper Flex Duct Installation Inspection Gallery Internachiв Hvac > heating inspection gallery internachi®. internachi inspection image gallery. hvac. heating. The official recommendation from the adc is that flex ducts should sag no more than 1 2 inch per foot of length between supports. the supports need to be at the manufacturer’s recommended spacing, but no longer than 4 feet. the straps that hold up the flex duct need to be no less than 1.5 inch wide. The supports need to be at the manufacturer’s recommended spacing, but no longer than 4′ maximum. the straps that hold up the flex duct need to be no less than 1.5″ wide. the adc standards give a lot of other details about installation, including one of the most important aspects, the connections. The adc standards (5th edition, section 4.6) make the following requirements regarding support of flexible duct. the ducting should be supported at the manufacturer’s recommended intervals, but the supports should be no greater than 4 feet apart and there should be no more than ½ inch sag per foot between the supports.
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