Moisture repellent air duct products

摘要

Water resistant fibrous air duct insulation products and methods for making such products. The products may include a duct board or a duct tube including a plurality of layers of resin-bonded fibrous mat. The duct board or tube is preferably rendered water-repellent at the air stream surface by incorporating a hydrophobic agent into the resin of at least one of the layers adjacent the air stream surface.