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Carrier 330426-406 Grommet Assembly

Carrier 330426-406 Grommet Assembly

Carrier

The Carrier 330426-406 Motor Arm and Grommet Assembly is the OEM motor mounting arm with its rubber vibration-isolating grommet already fitted, used inside Carrier, Bryant and Payne residential fan coils and air handlers to carry and position the indoor blower motor. It is a formed metal arm with a 90° bend and a tan rubber grommet seated through the end of the arm, so the motor mount arrives as one drop-in replacement assembly with the isolation grommet exactly where the factory put it. Carrier lists it as an ARM & GROM ASSY, and while 330426-406 is a small HVAC blower motor mounting part, it is the piece that keeps the blower motor from passing its vibration into the cabinet and ductwork.

This arm is listed for Carrier fan coil models in the FA4CNC, FA4CNF and FB4CNF families, including the FA4CNC018005AAAA, FA4CNC030008AAAA, FA4CNF024005AAAA and FA4CNF030010AAAA, and the FB4CNF024L00EFAA, a 2-ton residential multipoise fan coil with an aluminum coil. It also serves the matching Bryant and Payne badged units built on the same platform. The 330426 dash-number family covers several arm styles, and 330426-406 is not interchangeable with the 330426-411 arm: the 330426-411 has a different arm shape and a black grommet, while 330426-406 has the L-shaped arm and tan grommet. Always match the complete model number and serial number from the unit nameplate before you order.

Here is how the part works. A blower motor is a vibrating mass, and a rigid mount would pass every bit of that motion straight into the sheet metal. The rubber grommet acts as a spring and damper: it lets the motor float slightly while the arm holds the shaft position relative to the blower wheel. When the rubber ages, it hardens, cracks or flattens, the motor sags, and you hear a hum, buzz or rattle that gets worse at high speed. A bent arm or a worn grommet can also let the motor drift out of alignment with the wheel, which loads the motor bearings. Check the arm for cracks at the bend and the grommet for rot, oil soak or flat spots before you condemn the motor. To swap it, shut off power at the disconnect, support the motor so it cannot drop, note the arm orientation and grommet position, install the new assembly, and confirm the motor sits square and centered on the wheel before you close up the blower compartment.

Key Benefits

  • Pre-assembled grommet: The rubber isolation grommet is already seated in the arm, which saves bench time and keeps the vibration-damping geometry exactly as Carrier built it.
  • OEM fit: The Carrier 330426-406 arm is the one called out for the FA4CNC, FA4CNF and FB4CNF series, so there is no bending, drilling or field fabrication.
  • Quieter operation: A fresh vibration-isolating grommet stops the blower motor from rattling against the cabinet and cuts structure-borne noise in the duct system.
  • Protects the blower: Holding the motor in its factory position keeps the shaft aligned with the blower wheel and reduces bearing wear and wheel wobble.

Common Questions

What does the 330426-406 arm do?
It is the motor mounting arm for the indoor blower motor. The arm supports and positions the motor, and the rubber grommet isolates motor vibration from the air handler cabinet.

Which units use the 330426-406?
It is listed for Carrier, Bryant and Payne residential fan coils, including the FA4CNC, FA4CNF and FB4CNF series. Confirm with your full model number, because related 330426 dash numbers such as 330426-411 are separate parts for different equipment.

Can I reuse the old grommet?
We recommend replacing the arm and grommet together. Aged rubber hardens and loses its damping, so a new assembly is the right call whenever the motor mount is apart.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.