Four Steps to Avoid Unnecessary Noisy Fans - Greenwood


25 June 2014

Four Steps to Avoid Unnecessary Noisy Fans

Is your fan keeping you awake at night?

Is there anything more annoying than a noisy extractor fan?

Or a fan that keeps whirring into action in the middle of the night?

Homeowners in their new lovely surroundings don’t want the nuisance noise and social housing tenants link noise to pounds and pence.

Four Steps to Avoid Unnecessary Noisy Fans

  • The design of the fan is crucial with regards to removing noise from operation.  The type of motor, fan scroll and impellor, anti-vibration design and aerodynamics all play a part on the overall decibel rating of the fan – a very important starting point.
  • Where you choose to install a fan impacts on performance.  Long lengths of duct or too many bends coupled with an immediate 90 degree bend straight off the spigot that if flexible, may be crushed, no amount of good design is going to stop the fan being noisy!  As a general rule, axial fans are suitable for wall and window short ducted applications with centrifugal or mixed flow fans more suited to longer duct runs, flat duct applications or termination through tile vent terminals. Always seek specialist advice from the manufacturer.
  • Check the spec. Correct on-site set up is key to reducing noise – never under spec a fan or a system and never run it at full capacity – think about the end result during installation. Fan performance is dependent on the resistance offered by the duct system. Keeping the speed of the air within ducts low, noise levels will be improved.
  • Automatic sensing is an effective way of controlling ventilation in homes – humidity means moisture and this needs to be extracted.  However, sensing technology in many fans is not intelligent enough to distinguish between a warm and humid summer’s evening and a shower or a bath.  With changes in ambient humidity up to 60% throughout the year, the fan is more than likely to come on when it isn’t needed – causing nuisance running and noise!! Therefore, look for products with built-in adaptive ventilation technology to overcome these issues.

And whilst it is imporantt to do everything to reduce noise and make ventilation fade into the background, be prepared to be asked the question: “Have you got anything noisier – I want to hear the fan clearing the air!”tan

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