Furnace causes noticeable vibration and rattling in ducts and cabinet during operation.

Safety first: Turn off power before tightening or adjusting components.

Steps:

• Check all furnace cabinet panels and secure them with screws; add foam tape where panels rattle.
• Inspect the blower assembly for missing mounting screws or misalignment.
• Observe the inducer motor while running (with caution); if it vibrates excessively, the CTC inducer assembly may need replacement.
• Inspect nearby ductwork for loose hangers or contact with framing; secure with proper supports.