Compound 2 to 1 pass and extended doors consist of a lower panel that is half the height of the upper panel, and an offset upper panel, making room for the door panel above to slide in front of “or pass” the offset panel. In this situation, the lower panel will be constructed with a wider trucking sill. This is called an extended sill. This extended sill will need to be included on all doors in the same line.
Compound Pass doors also require a Fire Lintel that closes the gap between the upper panel and the wall. Fire Lintels are designed to pivot down when they come in contact with the panel above.
These are used at the lowest landing when there is minimal pit depth.
MIN. FLOOR TO FLOOR: 1.17 x OPENING HT + 406 mm [16 in]
MIN. PIT: 0.33 x OPENING HT + 102 mm [4 in]
RETURN SPACE: 330 mm [13 in] BOTH SIDES
CAR CLEARANCE: 170 mm [6 3/4 in]
MAX CAR LAP: 50 mm [2 in], BEFORE NOTCHING PLATFORM