Greenwood | Low Energy Bathroom Fan, Heat Recovery System, Whole House Ventilation

Welcome to all things Passive Ventilation

Window Vents and Building Regs

Equivalent area, free area, cross ventilation, acoustic issues and more - Read our comprehensive guide to the Building Regulations and understand more about background ventilation requirements.


Push-Fit Vents save time, money and hassle!

Designed in response to our customers wanting a quick solution to installing vents -  pull out the vent from the box and clip it into the rout - no more screws required!


Smallest 5000 Equivalent Area Vent

Where background ventilation rates have signifcantly increased through Building Regulations, space for window vents has become an issue in some developments.

The 5000EA solves this problem - the smallest in the UK at only 410mm long you can reduce the number of openings you need!

Do Not Disturb...

We have extensive acoustic range and work with a number of acoustic consultants advising on applying ventilation to noisy developments

We also offer the UK's highest performing passive wall ventilator (MA3051) which delivers an acoustic attenuation up to 55dB(A), perfect for sites with noise planning restrictions.

From the Blog

This video will change everything you know on window fans for housing With domestic burglary in urban areas TWICE the national rate per 1000 homes, security should still be firmly on the agenda for landlords
Curves in all the right places Find out what other key question we should be asking when it comes to Heat Recovery Ventilation.

Latest Videos

Secured by Design Accredited Window Fan - The most secure in the UK. Where windows are targeted as a means of entry in a home, the fan can also be used to gain access. Omnique is SBD accredited to PAS24:2012 by the Loss Prevention Board and significantly reduces risk for social housing.

Latest news


2/3/2018 - Office closing early due to adverse weather


CV3 Shortlisted for two H&V News Awards


Our 5000EA Window Vent Range Exceeds 1m Unit Sales



Zehnder Group