Spraying 2.6 lbs density urethane foam around a high temperature vent over a furnace prior to installation of Andek Firegard Andek Firegard may be applied by brush in difficult to reach spacesUrethane foam over large ducts may be protected by Andek Firegard even in hot, humid spaces Andek Firegard provides an impact resistant coating over all types of insulation and enhances its performance while providing fire resistance.