Furnace produces noticeable vibration and rattling noises through the ductwork.

Safety: Turn off power before tightening hardware.

Steps to check:

• Tighten panels: Ensure all Armstrong Air furnace access panels are properly seated and screws are tight.
• Inspect blower housing: Check mounting bolts and brackets securing the blower assembly to the cabinet.
• Check blower wheel: Spin the blower wheel by hand to see if it wobbles. If bent or unbalanced, it should be replaced.
• Secure ductwork: Inspect nearby ducts for contact with framing and add hangers or padding where needed.