Oversized Fire-Rated Aluminum Floor Hatches Now Offer Sizes Up to 80″ x 80″

While Most Manufacturers Stop at 48×48, We Offer Fire-Rated Floor Hatches Up to 80×80!

Williams Brothers - WB FD 8500-XL Series Oversized Flush Fire-Rated Aluminum Diamond Plate Floor Hatches

We’re proud to announce that our popular WB FD 8500 floor hatch is now available in a range of larger sizes. The new oversized doors feature openings from 48″ x 60″ all the way up to 80″ x 80″ — far surpassing the industry standard. While most manufacturers max out at 48″ x 48″ for fire-rated floor hatches, our FD 8500-XL Series goes further, delivering unmatched size, strength, and fire protection. Engineered for environments where fire safety is non-negotiable, this flush access door redefines what’s possible in floor installations — proudly made in the USA.

Certified 2-Hour Fire Rating for Floor Applications

This access door delivers proven performance — lab-tested and approved for fire resistance in floors up to 80″ x 80″, making it the largest fire-rated option on the market.

Reinforced for Pedestrian Traffic

Featuring a heavy-duty, 1/4″ reinforced aluminum cover and an aluminum/stainless steel frame hatch can safely handle 300 pounds per square foot (psf) loading.

Advantages

  • Oversized Models – Industry leading door for applications up to 80″ x 80″
  • Heavy-Duty Build – Reinforced aluminum cover with stainless steel frame
  • 2 Hour Fire Rated – Warnock-Hersey tested to NFPA 288 (ASTM E119)
  • Automatic Closing Mechanism – With UL-listed 165° F fusible link
  • Made in the USA – Precision-built in the United States

» VIEW WB FD 8500-XL SERIES OVERSIZED FLUSH FIRE-RATED ALUMINUM DIAMOND PLATE FLOOR HATCHES

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