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Both Flexbox and Fiberglass electrical boxes from Allied Moulded offer distinct advantages over traditional metal boxes. Prioritize strength, fire resistance, and corrosion resistance with Fiberglass. For an easier and faster installation with good fire safety and non-corrosive properties go with Flexboxes. Ultimately, the best choice depends on your specific project requirements and priorities.

Fiberglass Boxes

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Fiberglass electrical boxes from Allied offer several advantages over traditional metal boxes:

  • Strength and Durability: Allied Moulded fiberglass boxes are made of thermoset polyester material reinforced with fiberglass, making them resistant to warping, bending, and impacts.
  • Corrosion Resistance: Fiberglass is non-corrosive, unlike steel boxes that can rust over time, especially when exposed to moisture.
  • Fire Resistance: Fiberglass boxes are fire-resistant and suitable for use in fire-rated walls and ceilings.
  • Lightweight: Fiberglass is lighter than steel, making fiberglass boxes easier to handle and maneuver during installation. This can translate to lower installation costs due to reduced labor required.
  • Non-Conductive: Fiberglass doesn't conduct electricity, which can help to improve safety by reducing the risk of accidental grounding.
  • Ease of Modification: Fiberglass can be drilled or cut more easily than metal, which can be helpful during installation for running wires or making adjustments.



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Flexbox electrical boxes, manufactured by Allied are designed specifically for electrical contractors seeking benefits similar to those of traditional "soft boxes" but made from a more durable material. Here's a breakdown of the advantages of Flexbox electrical boxes:

  • Installation Friendly: Square corners and round profiles make them easier to cut into drywall compared to some traditional box shapes.
  • Secure and Fast Installation: Steel wing brackets provide a firm grip for secure mounting, while built-in Speed Klamps™ simplify securing wires, saving time on the job
  • Non-corrosive and Fire-resistant: Made from non-corrosive, engineering-grade thermoplastic materials that doesn't conduct electricity, improving safety by reducing the risk of accidental grounding, and are UL® listed for use in 2-hour fire-rated walls
  • Large Capacity: Flexboxes offer a generous cubic inch capacity, allowing for more space to accommodate wires and devices within the box.
  • Versatility: The Flexbox line includes options for both old work (existing walls) and new work (during construction) applications.

Choosing Between Fiberglass and Flexbox:

Prioritize strength, fire resistance, and corrosion resistance? Choose Fiberglass.

Need an easier and faster installation with good fire safety and non-corrosive properties? Flexboxes are a great option.