Continuous Extract | Extractor fans - Greenwood

Our Continuous Extract | Extractor fans range

  • Unity CV3

    BRAND NEW - The next generation of low energy extractor fan. Including SMART Technology and the first ever with Contactless Technology for simple set up and real time data logging from installed environment
  • Unity CV2GIP

    Unity is a continuously running low energy extractor fan that revolves around one product for the bathroom (5 l/s) and the kitchen (8 l/s). Offering very low running noise, Unity CV2GIP is a Greenwood GIP product and includes SMART technologies for humidity and timer control as well as the easiest possible SMART pad set up.
  • Omnique

    Omnique is unlike anything else! A SMART multifunctional ventilation fan offering both intermittent and continuous ventilation options for all room types. Also includes SMART Humidity and SMART Timer control options to further enhance performance and eliminate heat loss and nusiance running. Mixed flow impellor. SMART pad for set up. Five year guarantee.
  • PFACV2

    The picture frame adaptor has been specifically designed for retrospective installations of the Unity CV2GIP fan where there is an existing 150mm hole and where the fixing screws and wall need to be covered effectively.
  • Secured by Design Fan

    The Omnique window fan is Secured by Design accredited - the only one of it's kind which offers the safest option for window fan installations and is intruder proof - design in conjunction with Social Landlords


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We have seen a massive adoption of Continuous Ventilation into existing homes - especially with social landlords.

Intermittent Extract Drawing v2

How does it work???

  • Continuously running extractor fans are installed in the wet rooms of the property, e.g. bathroom and kitchen
  • In accordance with Building Regulations, the fans are set to continuously trickle with a boost option that can either be wired into a light switch or can automatically boost e.g. in response to humidity levels within a property
  • The fans run 24 hours per day (usually 22 hours on trickle and 2 hours on boost) but this is directly related to occupancy in homes. 

Why have we seen such huge adoption in social housing specification?

  • Continuous ventilation has many benefits and offers solution to many social housing issues - espeically mould and condensation. 
  • Continuous Ventilation offers an all round low energy, low noise solution for tenants - and it protects the building effectively. One of the major benefits is that it can be installed in the same place that a traditional intermittent (ON/OFF) fan would have been, meaning little or no remedial work for the contractor or landlord.
  • Continuous Ventilation provides excellent air change to a property all year round at extremely low running costs - in fact, the equivalent of less than a penny a day to run for the entire year!

Choose continuous ventilation if your have consistent mould and condensation issues...

The graph above shows the different between intermittent and continuous ventilation and the filled colour sections indicate the amount of ventilation provided to the property within a 24 hour period.

Continuous ventilation offers a consistent low level extraction of moisture from the property with an intermittent boost and, therefore, a much higher rate of air change within the property throughout the days, week, months and years. If there are issues with mould and condensation, this methodology will work to eliminate these issues effectively.

Don't worry though - With low energy designs and motors, continuous ventilation offers an effective ventilation stratgey that costs occupants less than a penny a day to run for the entire year!!

More benefits of Continuous Ventilation

Existing property insulation levels are improving thanks to loft and wall insulation and new windows - if you insulate you must ventilate and continuous ventilation provides:

  • ' a one product concept - 'one fan, any room, all installations' -  therefore it reduces the number of products to manage and specify. In addition, the landlord benefits from consistent air changes and levels of ventilation, eliminating potential issues with mould and condensation forming within the property.
  • More effective ventilation in homes with high occupancy e.g. more cooking, breathing, showering and drying laundry inside
  • A very low energy ventilation solution - as low as 1 watt in operation - costing the equivalent of two cans of branded baked beans to run for the entire year (Unity CV2GIP)
  • Benefits to tenants by having very low running noise - Greenwood continuously running fans have some of the quietest installed performances - as low as 10dB on trickle speed - offering a discreet and very quiet fan for bathrooms and kitchens
  • An easy paty to Guaranteed Installed Performance as Greenwood Continuous Ventilation has 100% airflow adjustability which  allows on-site flexibility and assurance that ventilation is set up to do what it is supposed to do

Be careful not to over-ventilate and cause unnecessary heat loss...

One of the benefits of continuous ventilation is achieving a higher air change rate throughout the property every day. This not only contributes to a consistent indoor air quality and dilution of airborne particles and VOCs, but also continues to protect the property from the causes of mould and condensation.  

The Building Regulations set out the continuous ventilation rates for the entire dwelling and for each room. These airflow rates are set to enable effective ventilation in the property as they are running 24 hours per day.  Therefore, it isn't necessary to increase these rates, especially in existing properties that will have higher rates of natural air leakage. Increasing airflow rates causes over ventilation which, in turn, causes:

  • Higher energy costs to tenants
  • Unnecessary heat loss from homes - especially important as we tackle fuel poverty around the UK
  • Noise - since the fan is probably running at a higher speed than required.

The Building Regulations ADF:2010 set out the airflow rates which can be used as best practice in refurbishment applications:


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