8663RP B Unit for NuTone,8664RP B Unit for NuTone 8663RP,Mot
✅ PROS
- Direct drop-in replacement for NuTone 8663RP/8664RP — no rewiring or housing modification needed
- Noticeably quieter operation than the original NuTone motor, per multiple verified buyers
- Includes the full B-unit assembly (motor, blower wheel, and mounting bracket) at a fraction of OEM cost
❌ CONS
- Some units arrive with slightly misaligned mounting holes requiring minor filing to fit older housings
- Plastic housing feels less robust than the original NuTone metal construction — handle with care during install
The Verdict
Your bathroom fan has been wheezing for months. You finally pull the cover, and there it is: a seized motor caked in dust. Now you’re staring at replacement options — and the OEM part number from NuTone costs almost as much as a new fan. That’s exactly where this 8663RP B unit enters the conversation.
What’s actually in the box
This is the complete motor assembly — the B unit, not just the motor. You get the motor, the blower wheel already attached, and the mounting bracket. As shown in the product image, it’s designed to slide directly into existing NuTone housings that accept the 8663RP or 8664RP configuration. No cutting sheetrock, no rewiring the house, no replacing the ceiling housing. Unplug the old unit, remove three screws, reverse the process. Most buyers report a 15-to-20-minute job if the housing is accessible.
Real-world performance
The motor specs matter less than how it behaves in practice. Multiple verified purchasers note this replacement runs quieter than the original NuTone motor they pulled out. One reviewer mentioned their wife actually asked if the fan was on because it was that much quieter. Airflow is comparable to OEM — not dramatically stronger, but you’re not losing performance either.
The 120V motor is rated for continuous duty, which matters if you run the fan for extended periods after showers. It moves roughly the same CFM as the original, so you won’t need to recalibrate your bathroom humidity routine.
What buyers consistently praise
The “drop-in” claim holds up. One buyer with a 20-year-old NuTone fan wrote that the replacement “fit perfectly and was plug-and-play — no adapter needed.” The price point also gets consistent mention, with buyers noting this costs significantly less than sourcing the OEM part from NuTone directly. For a repair that doubles your fan’s lifespan, the value proposition is strong.
Where it falls short
The plastic housing is the most common complaint. The original NuTone units used a metal housing that shrugged off rough handling. This unit needs a gentler touch during installation — don’t torque the screws, and be careful when aligning the bracket. A handful of buyers reported the mounting holes were slightly off-spec, requiring them to file the bracket slightly to fit older housings. It’s not a dealbreaker, but it’s worth knowing before you start.
Also, this is a motor replacement, not a fan replacement. If your housing itself is cracked, corroded, or sagging, this won’t fix that. You’re addressing the rotating assembly only.
Who should buy this
- DIY homeowners with a dead NuTone fan — if you can handle a screwdriver and basic wiring (or just unplugging a connector), this is a straightforward weekend repair.
- Landlords or property managers — extending the life of existing ceiling fans without ripping out housings across multiple units is a solid cost-saving move.
- Anyone who wants a quieter fan without replacing the whole assembly — the noise reduction is a genuine upgrade.
Skip it if your fan housing is damaged, you’re looking for a significant airflow increase, or you’re not comfortable working near electrical connections — call a pro in that case.
FAQ
Q: Does this fit all NuTone fans? No. It fits only fans that use the 8663RP or 8664RP B unit configuration. Check your existing motor’s model number before ordering.
Q: Is wiring required? Most installations are plug-and-play with a connector. Some older homes may have hardwired connections requiring a wire nut splice. The motor has standard black/white wires.
Q: How long will it last? Buyers report good longevity, with several noting years of daily use without issues. Clean the blower wheel annually to extend motor life.
The Verdict: 4.6/5
Buy it if you need to revive a dead NuTone fan without shelling out for a full replacement and you’re comfortable with basic DIY.
Skip it if your housing is compromised, or you expect OEM-grade metal construction at aftermarket prices.
For the money, this is the most practical fix for a common household annoyance. Just be patient with the plastic housing during installation.