Babcock-Davis BU-Series: B-UW fire-rated, uninsulated access doors provide access through openings in fire rated vertical surfaces and have a minimal sight line for a concealed appearance. UL Listed "B" label for 1-1/2 hours in vertical surfaces (maximum temperature rise to 250F in 30 minutes). B-UW fire rated access doors are manufactured with a tape in bead flange for a concealed appearance in vertical drywall surfaces, leaving only the door exposed.