Trough Frame Heavy Duty Loading Single Door

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Trough Frame Heavy Duty Loading Single Door

The heavy-duty (channel frame) type floor access door with a drainable frame is designed for interior and exterior applications to reduce the amount of water, dirt and debris entering the area below. It is designed for off-street locations that may occasionally receive ASASHTO H-20 wheel loads.


These doors should not be considered watertight.

See watertight/flood resistant doors

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Material: Aluminum, steel or stainless steel available
Frame: 1/4”material; extruded (aluminum only) or fabricated trough section with integral anchoring system and 1-1/2” threaded drain coupling. All parts of the frame coming in contact with concrete shall be coated with bituminous paint
Covers: 1/4” diamond plate reinforced for AASHTO H-20 wheel load
Gasket: EPDM Odor Reduction Gasket
Hardware: All 316 SS nuts, bolts and washers
Hold-Open Device: 316 SS Hold-open arm with secondary latch mechanism
Lock device: 316 SS slamlock with threaded plug, removable outside key and fixed inside handle
Lift Assist: Springs or gas shocks
Lift Handle: Recessed lift handle lays flush with top of cover
Warranty: Ten (10) years on aluminum, five (5) years on steel and stainless steel

Optional Features

  • Stainless steel vertical springs or gas shocks for easy opening, (also with removable bolt-on spring housings)
  • Recessed staple and other locking devices
  • Bituminous coating on frame surface in contact with concrete
  • Frame skirts for easy casting into a concrete top sla
  • Debris gasket
  • Fiberglass insulation with metal liner
  • Custom lettering
  • Nut rails with stainless steel sliding nuts for attaching cable holders, brackets & other hardware
  • Anodized finish
  • Stainless steel safety chains
  • Fall Through Protection Systems
  • Slip resistant surface bonded to cover plate
  • Side drain coupling (instead of standard bottom drain)
  • Hinge covers on same long side (springs would be horizontal)


The floor access door shall be Model THS as manufactured by USF Fabrication, Inc. with the size being specified on the plans. Door leaf shall be 1/4-inch thick aluminum diamond plate reinforced for an AASHTO H20 wheel load. Upon request, manufacturer shall provide structural calculations showing that the door design meets the loading requirements of AASHTO H20. (The access door is designed for off-street locations that may occasionally receive AASHTO H20 wheel loads.) The frame shall be extruded aluminum trough section with an integral anchor flange on all four sides. The frame shall include an EPDM odor reduction gasket that reduces the amount of odor that escapes from below the door and a 1-1/2 inch threaded drain coupling. The floor access door shall be equipped with a flush lifting handle that does not protrude above the cover, and a 316 stainless steel hold open arm with secondary latch mechanism that automatically keeps the cover in its upright, open position. The door shall have 316 stainless steel hinges and 316 stainless steel tamper resistant bolts/locknuts. The door shall be equipped with a watertight 316 stainless steel slamlock with threaded plug, removable outside key, and fixed inside handle. The slamlock latches onto a 316 stainless steel striker plate that is bolted to the frame. Installation shall be in accordance with the manufacturer’s attached instructions. The entire frame including the seat on which the reinforcing rests shall be supported by concrete or other material designed to support the specified load. The door shall be manufactured and assembled in the United States.

Light Vehicular / Occasional Truck Traffic

ASTM C1802-20 Load Level 3 & 4