Cat “A” or “B”

Pertains to positive pressure fire doors.

Category “A”: A fire door that does not require the addition of other edge seal components to comply with positive pressure. i.e., built into the door – all intumescence and/or gasketing is furnished.

Category “B”: A fire door that requires the addition of and edge seal to comply with positive pressure requirements. The edge seals are typically added to the frame or field applied to the door, i.e. all intumescence and/or gasketing is furnished by others.

In all cases, installation instructions are required.

Full liability for category “A” and limited for category “B”.