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Noisy Motor

Various factors affect the rangehood noise level

  • Filter Clogging: Heavy grease or carbon buildup on mesh or baffle filters restricts airflow, forcing the motor to work harder and creating high-pitched air turbulence.
  • Ducting Size and Material: Flexible, ribbed foil ducting or narrow pipes create significant resistance and air friction, generating far more noise than smooth, rigid PVC or metal pipes of the correct diameter. Correct size ducting for most models is 150mm.
  • Duct Bends and Length: Multiple sharp 90-degree elbows or excessively long duct runs force the exhaust air to change direction violently, increasing static pressure and fan noise.
  • High Fan Speed Settings: Higher speed levels naturally displace a much larger volume of air per minute (CFM), increasing motor noise and wind velocity sound.
  • Blocked Exterior Vents: Stuck damper flaps, bird nests, or leaf buildup in the outside wall cowl create backpressure that forces air to whistle or blow back into the canopy.
  • Cabinet Cavity Resonance: Hollow overhead cabinetry surrounding an under-cabinet or built-in rangehood can act as an amplifier, echoing normal motor vibrations throughout the kitchen.