36 x 36 Flush Fire-Rated Aluminum Diamond Plate Floor Hatch – WB FD 8500 Series


This rugged, flush fire-rated floor access door designed for new or existing openings in interior utility and general purpose applications. In subways, skyscrapers and everything in between, the WB FD incorporates the latest fire-resistant technology to protect floors above from fire below. Featuring a heavy-duty, 1/4″ reinforced aluminum cover and an aluminum/stainless steel thermal-break frame both with a mill finish, hatch is Warnock-Hersey tested for a 2 hour fire rating. In addition, it is reinforced for pedestrian traffic and can safely handle 150 pounds per square foot (psf) loading. MADE IN USA.

Note: A drawing of your exact floor hatch will be supplied upon order for approval.

Model #

WB FD 8500 36X36


WB FD 8500

Door Size (WxH)

36" x 36"

Rough Opening (WxH)

Contact Factory

Shipping Weight

86 lbs.


1/4" Reinforced Aluminum Diamond Plate with Thermal-rated composite Fire Panel


Thermal-break Frame with Aluminum Upper Frame and Stainless Steel Lower Frame


Mill Finish


Cast Aluminum Flush Lifting Handle

Lift Assistance

Stainless Steel Compression Springs Contained Within the Door Assembly

Automatic Hold-open Arm

316 Stainless Steel Hold-open Arm with Vinyl Grip That Automatically Keeps the Cover in its Open/Upright Position at 90°

Automatic Closing Mechanism

Mechanism to Automatically Close and Latch the Cover When Heat Breaks a 165° F Fusible Link


316 Stainless Steel Nuts and Bolts


150 psf (732 kg/m2) Live Load


Warnock-Hersey Tested for a 2 Hour Fire Rating, Tested to NFPA 288 (ASTM E119)


Door is designed for Dry, Interior Locations Only

Custom Sizes

Available on Request