Carrier 330426-412 Arm Assembly

Q: What does the Carrier 330426-412 do?

It mounts and positions a blower motor and its grommet isolates the motor's vibration from the cabinet. It is a Carrier ARM & GROM ASSY.

Q: How do I confirm I need the 330426-412 and not another 330426 number?

Read the number stamped on the old arm. The 330426 dash numbers are separate parts, so use the nameplate model and serial number to double-check if the stamping is worn.

Q: My blower hums at high speed. Is it the arm?

It can be. A hardened grommet or cracked arm commonly shows up as a hum or buzz that is worst at high speed. Inspect the arm and grommet before spending money on a motor.

Carrier

$19.77

The Carrier 330426-412 Arm and Grommet Assembly is a Carrier factory motor mounting arm sold with its rubber grommet already in place. It is also written ARM & GROM ASSY. It is one number in the 330426 series of motor arm assemblies, which already includes the 330426-406, 330426-409 and 330426-411 and runs through 330426-401, 330426-403, 330426-405, 330426-407, 330426-408 and 330426-410. The series is a set of separate parts, not interchangeable options, so the 330426-412 is for the arm that is stamped 330426-412.

A blower motor has to sit still while it spins. The arm supplies the rigid mounting point that fixes the motor at the right position and keeps the shaft square to the blower wheel, and the grommet supplies the soft isolation between the motor and the metal frame. If either one fails you hear it: a low hum that follows the motor speed, a buzz in the cabinet, or a rattle that comes and goes as the motor moves on a loose or cracked arm.

A ten-minute inspection tells you whether this part is the cure. With the power locked out, grip the motor and try to rock it: a small, cushioned give is normal, but play or clunking means the grommet has collapsed or the arm has bent or cracked. Look at the rubber for flat spots, splits and oil, and at the arm for rust and distortion. When you replace it, record the arm orientation, fit the 330426-412, tighten without squeezing the rubber flat, spin the wheel by hand to confirm clearance, then run the blower on every speed tap and listen for a smooth, steady sound.

Key Benefits

Factory-assembled: The Carrier 330426-412 arrives with the grommet fitted, so there is nothing to press in or align by hand.
Targets noise at the source: Replacing the isolator and the arm together removes the two most common causes of blower motor vibration noise.
Protects the motor: Correct motor position keeps the shaft square, which reduces bearing load and wheel rub.
Match by number: Compare the stamped 330426-412 on the old arm before ordering and avoid dash number mix-ups.

Common Questions

What does the Carrier 330426-412 do?
It mounts and positions a blower motor and its grommet isolates the motor's vibration from the cabinet. It is a Carrier ARM & GROM ASSY.

How do I confirm I need the 330426-412 and not another 330426 number?
Read the number stamped on the old arm. The 330426 dash numbers are separate parts, so use the nameplate model and serial number to double-check if the stamping is worn.

My blower hums at high speed. Is it the arm?
It can be. A hardened grommet or cracked arm commonly shows up as a hum or buzz that is worst at high speed. Inspect the arm and grommet before spending money on a motor.

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.