Testing Duct Insulation Ensures Indoor Air Quality
Fiber glass duct board and duct liner are tested for maximum design air velocities in accordance with UL 181 and ASTM C 1071 standards, respectively. The tests are designed to ensure that the maximum-rated airflow will not dislodge glass fibers into the airstream.
To meet the UL 181 Class 1 standard for duct board, manufacturers are required (on a continual basis) to test the product at 2.5 times the rated air velocity without showing any evidence of fiber erosion after initial blowdown.