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Williams Brothers FR 820 Series Drywall Fire Rated Access Door
This Fire Rated Access Door can be used in drywall wherever it is necessary to provide service access to shafts and any other location which must have a fire rating. Approved for wall and ceiling use. This door has a tape in flange that allows for a trimless appearance to eleminate visual distraction. Recessed trim is 2½" deep. Pivot Rod Hinge allows door opening of 140º. Has 16 ga. frame and can be used for walls and ceilings (ceilings up to 24" x 36").  These doors come ready to paint with a grey baked enamel primer coating.  Automatic self latching slam catch and masonary anchor straps come standard on all Fire-Rated Doors. The optional Hot Smoke Seal™ fire rated gasketing improves fire retardant efficiency. 

Submittal Sheet  Certificates of Approval  WB Catalog 

Cross Reference Chart 

Options and Accessories  Warranty 


  • Door: 18 ga. steel.
  • Frame: 16 ga., 1" wide perforated flange of 24 ga. galvanized material for mounting purposes, 2½" deep.
  • Insulation: 2" thick mineral wool (THERMAFIBER®), in between two pieces of 22 ga. steel.  
  • Hinges: Fully-concealed pivot rod type hinge allows opening up to 140º
  • Latches: Self-latching direct action latch, accepts both key and knurled knob.
  • Automatic Panel Closer: Furnished on all doors, vertical position only. Ceiling position requires self-assisted closing.
  • Inside Panel Release: Furnished on all doors
  • Finish: Grey baked enamel primer coat
  • Ceiling Installation: To comply with current fire regulations, largest size acceptable is 24" x 36"

Thermafiber® Industrial Felt insulation for optimal fire protection (rated noncombustible by NFPA Standard 220 when tested in accordance with ASTM E136 and withstands ASTEM E119) and superior sound control USG tested per ASTM C165:8 per STC 15-2" thickness.


  • Stainless Steel Finish Type 304 No. 4 Satin Finish Brushed
  • Stainless Steel Finish Type 316 No. 4 Satin Finish Brushed
  • Mortise Best Lock
  • Hot Smoke Seal™ all 4 sides* (priced above)
  • Special sizes available

* Hot Smoke Seal™ fire tested: Listed to meet the requirements of standards UL10B, UBC 7-2, Part 1 and BS476: 1987 for application to fire rated door assemblies.


  • Acudor Products Inc - N/A
  • Babcock-Davis - B-IW
  • Cendrex Inc. - PFI GYP 
  • ELMDOR Manufacturing Company - FRC-GB
  • Karp Associates, Inc. - KRP-350FR
  • J.L. Industries - FDWB
  • Larsen's Manufacturing - N/A
  • MIFAB Manufacturing, Inc. - MPFR-DW
  • Milcor - N/A
  • Nystrom Building Products - IW
  • Williams Brothers - FR-DW-820

     Call for custom sizes, price and availability.
    W x H Wall Opening Slam Catch   W x H Wall Opening Slam Catch
    12 x 12 12¼ x 12¼ 1   18 x 18 18¼ x 18¼ 1
    14 x 14 14¼ x 14¼ 1   24 x 24 24¼ x 24¼ 1
    16 x 16 16¼ x 16¼ 1        

    *** Doors size 16" x 16" and larger, extra spring supplied with door must be attached from back of door pan to framing or floor above in such a manner to insure the door is self closing

    (Free Shipping at 45+ doors)

    Call for custom sizes or quantity pricing.