B Label Fire Door

1 12 hour rating for a 2 hour wall. Frames used in masonry walls may be used with a maximum 3 hour fire door while frames used in drywall walls are in tended to be used with a maximum 1 12 hour fire door. Elmdor Non Insulated Fire Rated Wall Access Door Fr 8 X 8 If a frame bears a recognized label qualifying it as a fire door frame it may sup port a 3 hour a 1 12 hour a 34