Centaur 4" Round Fan Support B...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$146.37
Centaur 4" Round Fan Support Boxes – 1-1/2" Deep with Mounting Bracket Options per 12

Centaur 4" Round Fan Support Boxes – 1-1/2" Deep with Mounting Bracket Options per 12

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Model: CM-FSB

In Stock (leaves warehouse same day if ordered before 3pm ET)

$146.37
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Centaur 4" round fan support boxes are designed for secure, code-compliant installation of ceiling fans and light fixtures. Each box features a 1-1/2" depth and a fan-rated non-metallic construction. Available in multiple mounting configurations—including FB side mount, new work bar hanger, and old work bar hanger—these boxes provide flexible solutions for new construction and retrofit applications. Engineered for strength, ease of installation, and lasting performance in residential and commercial environments.

Variant SKU Length Width Depth Weight
CM-FSB-NBH 4 Inches 4 Inches 1.5 inches 2.2 Pounds
CM-FSB-OBH 4 Inches 4 Inches 1.5 inches 2.1 Pounds
CM-FSB 4 Inches 4 Inches 1.5 inches 0.65 Pounds

Product Specs

Box Type:
Round Fan Box
Fan Rated:
Yes
Mounting Feature:
Direct Mount, New Work Bar Hanger, Old Work Bar Hanger
Product Group:
Electrical Boxes
Product Subgroup:
Junction Boxes
Product Type:
Standard Junction Box
Product Diameter:
4 inches
Product Material:
Non-Metallic
Department:
Electrical
Product Depth:
1.5 inches

Centaur CM-FSB – Frequently Asked Questions

1) Can a Centaur 4 inch round fan support box actually hold a ceiling fan, or is it just a light box?
It's fan rated, so it's built to carry a ceiling fan as well as a light fixture. That's the whole point of the box: standard round junction boxes are not permitted to support a fan, and swapping one in without a fan-rated box is the most common failure on a retrofit. The Centaur box is 4 inches in diameter, 1-1/2 inches deep, and non-metallic.
2) I'm replacing a fan on a finished drywall ceiling and don't want to open it up. Which Centaur fan box works?
Order the old work bar hanger version. It's made to go in through the hole already cut in the finished ceiling, with the hanger bar bracing between joists from below. The direct mount version needs a joist or blocking directly behind the box, and the new work hanger is meant to be nailed to framing before the ceiling goes up.
3) How does the Centaur fan box come packaged, and is it sold individually?
They come 12 to a pack, one mounting style per pack. For a property manager or electrical contractor doing a run of units, that means you order by mounting style, not by the individual box, so decide up front whether the job is open framing or retrofit ceilings before you buy.
4) Is the Centaur fan box metal or plastic, and does that matter for grounding?
Non-metallic. That means the box body itself isn't part of the equipment grounding path the way a steel box is, so the fixture ground lands on the ground conductor in the box rather than on the enclosure. Electricians running NM cable in residential and light commercial work use non-metallic boxes routinely for exactly this kind of fan support.
5) Are these Centaur boxes suitable for commercial buildings or residential only?
Both. The 4 inch round fan support boxes are used in residential and commercial ceilings, and the three mounting options cover new construction and retrofit alike, which is what makes them practical for multi-family and hospitality fleets where some ceilings are open and some are already finished.
How fast can I get the Centaur CM-FSB delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Centaur CM-FSB come with a warranty?
Absolutely. The Centaur CM-FSB is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Centaur CM-FSB?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Centaur CM-FSB from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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