Ventilation Hood Noisy
- Why is the hood so noisy?
- Blower motor makes a loud noise whether on low or high speed
- Vent hood whistles
- Rheostat on fan motor will not lower enough to reduce excessive noise
Many factors could contribute to poor ventilation noise.
- Make sure the ventilation blower meets Wolf's CFM requirements for the unit being ventilated.
- Specific causes of excessive noise include:
- A 90° elbow directly off the ventilation hood's transition
- Less than 1' of straight ductwork off the ventilation hood's transition
- An unusual number of 45° or 90° elbows in the ductwork
- Multiple transitions within the ductwork
- A duct run less than 40'
- Smaller ductwork than recommended
- Ductwork that is not rigid
- Metal tapping noise may be damper being forced open by wind and a secondary damper installation may be required to resolve.
- If an in-line or remote blower is installed, verify the electrical wiring from the blower to the ventilation hood is properly secured.
- If any of the above do not comply with Wolf guidelines, a qualified HVAC professional may need to review the ventilation installation.
For further ventilation information, refer to the Wolf Ventilation Guide.
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