High-Load Capacity Floor Box

flh20-1-b- back box w/ configurable internal brackets for carpet cover

FLH20-0 Box
FLH20-0 Covers
FLH20-1 Box
FLH20-1 Covers

Choose your Box Size and Cover from the drop down

The FLH20 high load capacity floor boxes combine rugged construction and elegant design. They are ideal for high traffic areas where heavy equipment such as forklifts, automobiles, scissor lifts and portable stages are used.

All covers are designed to meet H20 load ratings using 7/8” thick type 6061 T6 heat-treated aluminum. The clear anodized cover is available for use in concrete, carpet or tiled floors. The two cable exit doors incorporate FSR’s exclusive 3 position cam locks which allow “One Click’ operation to open the cable door or remove the cover. An alternate cover option is a plain cover with no cable access doors for a when the box is used as a junction box and cable exit capability is unnecessary.

The innovations continue to the back box. The FLH20’s internal brackets are adjustable to provide a variety of installation possibilities based around standard electrical gang plates. Numerous combinations for both high and low voltage configurations make it the most flexible floor box available. Two universal openings accept one or two electrical plates with a maximum total size of 4 gangs. Each compartment can be electrically isolated or wiring can be passed between compartments with the use of our screw-less separator system.

FLH20 Floor Boxes meet the UL scrub-water testing standards.

Note: When this box is used on grade, it should be encased in concrete to prevent contact with the grade. To ensure compliance, we recommend using the FSR Pour Pan Accessory.


•    Designed for heavy floor traffic
•    Field configured multiple gang arrangements
•    Integral carpet edging or solid design
•    Leveling feet for easy installation
•    Cable pass-through ready
•    Two locking cable exit doors (not on utility cover)
•    Custom milled pocket depth available-consult factory