​
Features
  • 1/4 aluminum tread plate
  • Aluminum hold open device with red vinyl grip
  • 316 stainless steel gas springs
  • 316 stainless steel hardware
Options
  • ​Odortight
  • Gastight
  • Watertight for a 4-10 inch head
  • Mebac slip resistant coating
  • Locking devices​

Downloads

WT Series Specs (pdf)
File Size: 74 kb
File Type: pdf
Download File
  • TH Series WT
  • THG Series WT
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Standard Sizes

Model
Width
Length
Weight
TH-1A
​2'-0"
​2'-0"
60
TH-2A
​2'-6"
​2'-6"
81
TH-3A
3'-0"
​2'-6"
88
TH-4A
3'-0"
​3'-0"
100
Type "WT" access hatches are only available in standard single leaf access door sizes.
*Length measured on hinge-side

Drawing

Downloads

TH-WT Single Leaf Drawing (dwg)
File Size: 154 kb
File Type: dwg
Download File

Standard Sizes

Model
Width
Length
Weight
TH-1DA
4'-0"
4'-0"
154
TH-2DA
4'-0"
6'-0"
208
TH-3DA
4'-0"
5'-0"
173
TH-4DA
5'-0"
5'-0"
215
Type "WT" access hatches are only available in standard single leaf access door sizes.
*Length measured on hinge-side

Drawing

Downloads

THG-WT Single Leaf Drawing (dwg)
File Size: 146 kb
File Type: dwg
Download File

Specifications

Floor access doors shall be type "TH-WT" (gutterless) or "THG-WT" (gutter type) (WATERTIGHT, ODORTIGHT and GASTIGHT) as manufactured by Thompson Fabricating, LLC (Birmingham, AL). Door leaf shall be 1/4" aluminum checkered plate reinforced with structural aluminum channels and shall be capable of withstanding a 4'- 10" head with minimal deflection. (Calculations will be provided to the engineer upon request.) The following items shall be type 316 stainless steel: slam locks, brackets, hinges and hardware. The door shall have a 316 stainless steel gas spring with integral hold open device which will assist in opening the door and shall lock automatically in the open position. The door shall open a minimum of 90 degrees. The aluminum extruded frame shall have a thickness not less than 1/4" and shall incorporate a neoprene gasket that will reduce air leakage to less than 1 CFM per lineal foot of frame when the interior of the hatch is subjected to a 2 inch water column vacuum. For type "THG" doors the gutter frames shall be provided with a 1 1/2" threaded drain coupling. All fasteners which penetrate into the "Dry" area of the hatch shall be sealed with "O" Ring Seals to prevent incidental water and gas leakage. The portion of the frame which is in contact with the concrete shall receive a protective bituminous coating.

OPTIONS: Locking Devices
​Slip Resistant Coating

NOTES: Independent Lab Test Reports are available upon request.
All double leaf access doors shall have two interconnected slam locks which latch at both ends of the plate and can be un-latched from a single point.

SIZES: Type "WT" access hatches are only available in standard single leaf access door sizes.