Dettson furnace causes strong vibration and rattling noises through the ductwork.

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

• 1. Tighten cabinet panels: Check all access doors and side panels. Tighten screws and ensure panels are fully seated.
• 2. Inspect blower wheel: Remove the blower assembly and clean dust buildup from the wheel. Ensure no fins are bent.
• 3. Check furnace leveling: Verify the furnace sits level on its platform. Shim as needed to reduce vibration transfer.
• 4. Secure duct connections: Tighten screws and add foil tape where ducts connect to the furnace to reduce rattling.