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Is flex duct more likely to harbor mold and allergens? How long does flex-duct last? Is sheet metal worth the extra cost? |
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Resources -
Frequently Asked Questions
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 There really aren't any mold or allergy concerns with flex duct over sheet metal as a material for duct work. However, if you are putting flex duct in an attic or a crawl space, consider what happens when animals try to nest in these areas. Flex duct has a 12-15 year life expectancy. You can expect sheet metal to last the life of the building. Flex duct should not be used in commercial or institutional buildings.
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