Yes. Per the UL181 test standard, the flex duct must be inoculated with mold mycelia & spores and inhibit the inoculated area to grow over a period of 60 days. This test is done in a closed vessel without light and the vessel atmosphere is saturated with water vapor.
Does Flexible Duct inhibit mold growth?
April 1, 2013
Yes. Per the UL181 test standard, the flex duct must be inoculated with mold mycelia & spores and inhibit the inoculated area to grow over a period of 60 days.