| Firestop Specifications 1 Hour F & T Rated |
| UL Labs Certification and Firestop Configuration for One Hour Wall |
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The Dryerbox has been classified by Underwriters Laboratories, Inc.
for models 350, 425, 3D and 4D for use in
Through-Penetration
Firestop System Number W-L-7129.
Underwriters Laboratories Certifications Directory reference numbers: XHGK.R21933 (US), XHGK7.R21933 (CANADA) and XHEZ.W-L-7129 (FIRESTOP SYSTEM).
Cabinets
For Use in Penetration Firestop Systems
See UL Fire Resistance Directory
<25XC>
Firestop System Number W-L-7129
Click HERE for a direct link to UL's online specifications for firestop system installation.
Click HERE for the Dryerbox Classification Listing (for Canada, HERE).
Quick One-Hour Wall Firestop Instruction Summary
These key components are noted on the instruction sheet that comes with every Dryerbox. The following are highlights to comply with
the UL Classification for through-penetration firestop systems.
To achieve a fire resistance rating (one-hour F & T) 2X6 wood framing is required. The Dryerbox unit must be installed in accordance with the UL Cabinet System listing.
- An extra layer of type-X drywall must be installed in the ID of the stud cavity in which the Dryerbox is located. Drywall must be attached to nailers (minimum 1” X 2”) located on the inside of the cavity wall studs. Secure nailers to wall framing at max 18 in. OC. The screws used to attach the inner layer of drywall shall be spaced a maximum
of 18 inches apart.
- The entire depth of stud cavity with Dryerbox® must be filled with R19 fiberglass batt insulation. Additional insulation shall be added within the cavity as necessary to completely fill all voids around the periphery of the Dryerbox and around the dryer vent pipe.
- Use a Roto-zip-bit router tool to cut the drywall leaving a caulk joint for the painter. This void must be caulked or mudded.
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