For dust collection and exhaust transmission where airborne pollutants, fumes and odors are a major problem. Burst 3:1 Temperature range : 15 to 150°F Construction : Cover : White high density Pliovic® compound. Tube : White high density Pliovic® compound. Reinforcement : Rigid high density Pliovic® compound helix. The working pressure and vacuum ratings are based on ambient temperature of 70°F and will vary inversely with temperature changes.