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Fire-Rated Pass-Through Chambers

  • Fire-rated access panels carry the UL 10B label for 90-minute fire exposure (suitable for 2-hour wall rating)
  • 304 electropolished finish is ISO 5 – 8 compatible
  • Heavy-duty, double-wall insulated door construction prevents chamber misalignment and door damage when operators apply excessive force to an interlocked door
  • Fire-rated 10” x 10” (254 x 254mm) viewing windows allow convenient monitoring of pass-through contents
  • Rugged mechanical interlock prevents cross-contamination by allowing only one door at a time to open
  • Recessed pull-to-open latch withstands up to 50 lbs. of force without damaging the catch, interlock, or door frame
  • Spring-action, self-closing doors simplify operation, minimize the chance of contamination

These pass-through chambers are designed for installation in a fire-rated cleanroom or laboratory wall. They allow transfer of materials into and out of the controlled environment, and their rugged interlock mechanism offers high reliability with no maintenance. The electropolished all-304 stainless steel construction and continuous-seam welds ensure a clean environment compatible with cleanroom standards.

Architects & Builders: Click resource icons
SPEC logo BIM logo
Fire-Rated Pass-Through
insulated door
Electropolished 304 stainless steel access
doors feature 2.5" of insulation (No. 2641-12 shown).
Testing Standards:
Ul logo

Fire-Rated Access Doors

Each chamber features dual 2.5" (64 mm)-thick, insulated electropolished 304 stainless steel access panels (doors), each with a recessed pull latch. Insulation is SuperWool® Plus fire-resistant calcium-magnesium-silicate (CMS) fibers. Fire-rated viewing windows afford easy viewing of pass-through chamber contents. Adjustable spring hinges provide self-closure of both doors. These modules
bear a UL- listed “10B” label for 1.5 hours in walls (maximum temperature rise
to 450°F [232°C] in 30 minutes).
Chambers Tailored to Your Requirements
Modifications are no problem, as long as you keep these points in mind to retain the UL-B fire-rating:
  • Door thickness cannot be modified
  • Window dimensions cannot be modified
  • Pass-through chamber width and height dimensions other than what is shown in the ordering chart are possible, but are restricted to the outside dimensional (OD) range between 24" W x 18" H and 36" W x 48"H

  • Discuss your specific needs with a Terra Product Specialist.

  FEATURES & BENEFITS | Fire-Rated Pass-through

Self-Closing Doors
Spring-loaded hinges ensure that the door stays completely shut

Fire-Rated Glass
Clear, wireless glass uses fire-rated and impact safety-rated glazing
Heavy Duty Latch
Recessed pull-latch capable of withstanding 50 lbs. of force

Insulated Fire-Rated Door
2" thick insulated door meets UL 10B fire requirements for 90-minute fire exposure.

Mechanical Interlock
Rated for a million operations, this durable interlock minimizes the change of cleanroom contamination.

Fire-Rated Pass-Throughs*
Overall Nominal Dimensions
W” x D” x H” (mm)
Dimensions incl. hardware
W” x D” x H” (mm)
Inside Clearance Dimensions
W” x D” x H” (mm)
Electropolished 304 Stainless Steel
Cat. # Price
24 x 18 x 18
(610 x 457 x 457)
24.13 x 25 x 18.75
(613 x 635 x 476)
21.5 x 17.88 x 15.38
(546 x 454 x 391)
2641-11A Price
24 x 24 x 24
(610 x 610 x 610)
24.75 x 31 x 24.13
(628 x 787 x 612)
21.38 x 23.88 x 21.5
(543 x 606 x 546)
2641-12 Price
24 x 24 x 48
(610 x 610 x 1219)
24.75 x 31 x 48.13
(628 x 787 x 1222)
21.38 x 23.88 x 45.5
(543 x 606 x 1155)
2641-13 Price
36 x 36 x 36
(914 x 914 x 914)
36.75 x 43 x 36.13
(933 x 1092 x 917)
33.38 x 35.88 x 33.5
(848 x 911 x 851)
2641-14 Price
36 x 36 x 48
(914 x 914 x 1219)
36.75 x 43 x 48.13
(933 x 1092 x 1222)
33.38 x 35.88 x 45.5
(848 x 911 x 1155)
2641-15 Price
* Add 0.5" (13mm) to the outside hardware W x H dimensions for installation cut-out. All models include 10” x 10” (254 x 254mm) dual-side viewing windows. All chambers feature continuous-seam welds to prevent particle influx and simplify cleaning.

SuperWool® is a registered trademark of Morgan Thermal Ceramics

Access Clearances


Access Clearances
Width = W (nominal) – 1.88"
Depth = D (nominal)* – 0.12"
Height = H (nominal) – 1.25"

Wall Cut-Out = W (nominal) + 0.5" x H (nominal) + 0.5"


Standard Door Configuration

  Need Terra to do your installation?
Call to discuss your facility and schedule.

Pass-Through Installation

Fire-Rated Pass-Through Installation

Fire-Rated Pass-Through Chambers can be installed in a number of ways, depending on the wall or door that will support them. The cut-out size necessary to support each model size is the chamber width and height with an additional 0.5" (13 mm). Terra offers support brackets and hardware to ensure secure mounting (order separately). In most cases, a bracket kit provides ample support. Select support brackets for 36"D (914 mm) wall-mount models to brace the larger chamber. Two brackets are recommended for wide chambers (installed side-by-side on the wall).

Support Brackets
Two recommended for cabinets 36"D (914 mm)
Cat. # Price
Stainless Steel 1993-60C Price
Powder-Coated Steel 1993-83C Price

Why Such Small Windows?
Terra's fire door is listed under the UL 10B standard, which requires several performance criteria:

  • Maximum fire exposure of 90 minutes
  • Maximum temperature rise rating of 232 degrees Celsius in one hour
  • Fire hose stream test: while being burned, the door is exposed to a fire hose stream to put out the fire

For all three tests, the window needs to sustain test conditions without cracking or allowing smoke or fire penetration. Windows larger than 10" x 10" invalidate the temperature rise rating, which generally requires an exposed glass area of 100 square inches or less, and are much more prone to failure during the fire hose test.

Fire-Rated Convenience Doors also available: UL-B fire door mounts to most common wall types. Allows convenient transfer of small parts when a holding chamber is not required.

File Type File Name Publication Date
Video Fire-Rated Pass-Through Chamber
Fire-rated pass-through chambers from Terra are UL "B" fire-rated for 90-minute fire exposure (suitable for 2-hour wall rating). Watch this video to learn about more features and their advantages, including the self-closing door and rugged, high-use construction.
Video Cleanroom Pass-Through Operational Benefits
Learn about the twelve ways Terra cleanroom pass-through chambers can help overcome your operational challenges such as maintaining cleanliness, reducing cost, and transferring over-sized items into the controlled environment.
Manual (PDF) Cleanroom Pass-Through: Doc. # 1800-07
Manual (PDF) Easy Installation of Fire-Rated and Ruggedized Pass-Throughs
Fire-Rated and Ruggedized wall-mount pass-throughs can be installed and ready for operation in a few minutes once the wall cut-out is prepared.
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