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Free Standing Double Door

Standard or Insulated

Free Standing Double Door Fiberglass Enclosure



Ralston’s FRP-FS Series is designed to house electrical and/or electronic components in corrosive environments.


With the FRP-FS Series, it is possible to use an enclosure with high resistance to corrosion, thus obtaining better long-term results than traditional sheet steel types.

Especially recommended for installation in all environments, indoors and outdoors in which dust, humidity, presence of acids, extreme conditions such as snow, ice, tropical climate ect, make the use of fiberglass more advantageous.



All FRP-FS series enclosures are molded from fiberglass with a fire retardant resin, marine grade gel-coat with UV inhibitors. FRPI-FS has a 1" encapsulated urethane foam core. All FRP-FS Series are equipped with 3/8 metal collar studs for optional mounting inner panels. An EPDM rubber gasket with self-gripping core is applied to the molded lip around the door opening ensuring an optimum seal when the door is closed. Doors are mounted with a stainless steel continuous hinges, and secured closed with a stainless steel padlockable 3 point vault handle. The FRP series comes with an inner panel included with purchase.


Type 4X designed enclosure doors rest closed on a fixed center mullion and each door is equipped with a vault handle. Due to the fixed mullion design, the enclosure allows for two optional interior mounting panels rather than one large panel.


Type 12 designed enclosures have overlapping doors with the option of one large interior mounting panel.



• Exterior Surface: Marine Grade Gel-coat with UV inhibitors
•All enclosures are ANSI/ASA 61 grey. Inner back panels are painted with high gloss white powder coatings.


These enclosures are built to the requirements of NEMA type 13 for an oil and dust tight enclosure, and type 4, 4X  as a water tight corrosion resistant enclosure.  These enclosures meet Resin Systems: Fire retardant Class 1
Special Orders

Custom units with special finishes, sizes or punching can be supplied to order.



• Windows
• Encapsulated foam insulation
• Stainless steel lift-off hinges
• Stainless steel or fiberglass screened louvers
• Rear access doors