Description

Fan and Fixture Mounting Box for New Construction – 70 lb Fan / 200 lb Fixture

Meta description:
Fan and fixture mounting box for new construction with integrated 16 in steel bracket. Supports up to 70 lb ceiling fans and 200 lb fixtures. Fits sloped ceilings up to 45 degrees.

What is this product?
The FBB450 is a heavy-duty fan and fixture mounting box designed for new construction installations. It includes a factory-installed 16 inch steel mounting bracket and an 8 inch square mounting surface that supports larger fan canopies. This box is rated to support ceiling fans up to 70 lb and light fixtures up to 200 lb, including installations on sloped ceilings up to 45 degrees.

TL;DR – Who this is for

– Electricians installing ceiling fans or heavy fixtures in new construction
– Contractors working with sloped or vaulted ceilings
– Builders needing a high-capacity, code-compliant fan box
– Projects using fans with oversized canopies

Institutional Fit

– Suitable for residential and light commercial new construction
– Supports high-load fixtures without additional bracing
– 8 inch square mounting surface simplifies alignment for large canopies
– Paintable textured finish allows visual blending after installation

Key Benefits

– Rated for 70 lb ceiling fans and 200 lb light fixtures
– Integrated 16 inch steel mounting bracket included
– Compatible with sloped ceilings up to 45 degrees
– Large 8 inch square mounting surface
– 14.5 cubic inch interior capacity
– Paintable textured finish for clean final appearance

Technical Specifications

Part number	FBB450
Product type	Fan and fixture mounting box
Application	New construction
Fan load rating	70 lb
Fixture load rating	200 lb
Ceiling compatibility	Flat and sloped ceilings up to 45 degrees
Mounting surface	8 in square
Internal volume	14.5 cubic inches
Bracket	16 in steel bracket (installed)
Material	Plastic mounting block with steel bracket
Finish	White, paintable textured finish
Listings	UL / CSA
Country of origin	USA
Package size	1

Regulatory and Installation Notes

– Designed for new construction applications only
– Install in accordance with NEC and local electrical codes
– Verify ceiling slope does not exceed 45 degrees
– Ensure fan and fixture weights do not exceed rated limits

Durability and Lifecycle

– Steel bracket provides long-term structural support
– Non-metallic box resists corrosion and moisture
– Paintable surface supports clean aesthetics over time
– Suitable for repeated fan replacements without box removal

Procurement Notes

– Ideal for projects using heavy fans or large decorative fixtures
– Large mounting surface reduces need for specialty adapters
– Confirm canopy size and ceiling slope before ordering

Included Components

– Steel mounting bracket
– NM94 cable connector
– Mounting block with built-in electrical box
– Mounting screws and wood screws

Documentation

Click here for the spec sheet

FAQ

What is the maximum fan weight supported?
This box supports ceiling fans up to 70 lb.
Can this box be used for heavy light fixtures?
Yes. It supports fixtures up to 200 lb when installed correctly.
Is this suitable for sloped ceilings?
Yes. It is designed for sloped ceilings up to 45 degrees.
Can the box be painted?
Yes. The textured finish is paintable to match the ceiling.

Explore more from our collection.