
FireKing 3-1831-C Three Drawer Letter 31" D Fire File Cabinet
Price: $3,561.25
- Fire Rating: 60 mins 1700° UL (Underwriters Laboratories)
- External Dimensions: 40.25"H x 17.75"W x 31.56"D
- Internal Dimensions: 10.38"H x 12.19"W x 26"D
- Cubic Inches: 1.9 cubic feet
- Weight: 446 lbs
VERIFIED PROTECTION RATINGS:


UL 1-Hour Class 350 fire protection for vital business records
Built for businesses that cannot afford to lose vital records, the FireKing Classic High Security Vertical 3-1831-C carries a UL 1-Hour Class 350 fire rating, tested to 1700°F while keeping interior temperatures below 350°F. Three letter-size drawers and a UL-listed Medeco high-security key lock protect contracts, tax files, and irreplaceable documents. Made in the USA.
This three-drawer vertical cabinet measures 40.25" H x 17.75" W x 31.56" D and weighs 446 pounds, giving it the mass that backs its fire performance. Each letter-width drawer offers an interior of 10.38" H x 12.19" W x 26.00" D, roughly 1.90 cubic feet, with full-depth 31-inch drawer travel for hanging files.
Engineering & Security
- UL-listed Medeco high-security key lock: The factory key lock resists picking and drilling, and can be upgraded to a mechanical dial or electronic lock if your workflow requires it.
- UL 30-foot impact rating: Drop-tested to survive a fall through a collapsing floor, so contents stay protected even if the building structure fails during a fire.
- Steel lattice reinforcement: Internal steel lattice spans all six sides, distributing impact force and helping the cabinet retain its seal under stress.
- 446-pound build: Substantial weight reflects the dense insulation and steel construction that deliver the cabinet's certified fire and impact performance.
- Made in the USA: Manufactured domestically by FireKing and backed by a limited lifetime warranty with a free replacement guarantee after a fire.
Fire Protection & Interior
- UL 1-Hour Class 350 fire rating: Tested by Underwriters Laboratories at external temperatures up to 1700°F for one hour while interior temperatures stay below 350°F, protecting paper documents.
- ETL 1/2-hour digital media rating: Separately rated by ETL to shield digital media for 30 minutes, suitable for backup drives and storage media alongside paper files.
- Asbestos-free dry insulation: Dry fill retains its protective properties over the cabinet's lifetime and avoids the moisture issues associated with wet insulation.
- Water-resistant construction: Resists incidental water contact such as sprinkler discharge and fire-hose spray during an emergency response.
Drawer Layout & File Capacity
- Three letter-size drawers: Each drawer accepts standard letter-width hanging folders, with follower blocks included to keep files upright as drawers fill or empty.
- Full 31-inch depth: The 31-inch body and 26-inch interior depth give each drawer high file capacity for high-volume office filing.
- 1.90 cubic feet per drawer: Roughly 5.7 cubic feet of total protected storage across three drawers for active records and reference files.
Ideal Buyer & Use Cases
The FireKing 3-1831-C suits offices, accounting firms, and medical or legal practices that need certified one-hour fire protection for active letter-size files. At 40.25" H x 17.75" W x 31.56" D and 446 pounds, it stores three full drawers of records while resisting fire, impact, and incidental water.
If you need less capacity, the two-drawer 2-1831-CPA (letter) is a smaller alternative; for more storage step up to the four-drawer 4-1831-CPA. Offices that file legal-size documents should consider the legal-width 3-2131-CPA in the same series.
Fire Rating
60 mins
Fire Certification
UL (Underwriters Laboratories)
Fire Rating (°F)
1700°
Fill Type
Fire-Resistant Material
Made In
USA
Lock Type(s)
Electronic, Mechanical, Key
Location
File Cabinet
External Depth
31.56 inches
External Height
40.25 inches
External Width
17.75 inches
Weight
446 lbs
Internal Height
10.38 inches
Internal Width
12.19 inches
Internal Depth
26 inches
Cubic Inches
1.9 cubic feet
Fire Rating
60 mins
Fire Certification
UL (Underwriters Laboratories)
Fire Rating (°F)
1700°
Fill Type
Fire-Resistant Material
Made In
USA
Lock Type(s)
Electronic, Mechanical, Key
Location
File Cabinet
External Depth
31.56 inches
External Height
40.25 inches
External Width
17.75 inches
Weight
446 lbs
Internal Height
10.38 inches
Internal Width
12.19 inches
Internal Depth
26 inches
Cubic Inches
1.9 cubic feet












