The provision of background ventilation via through-wall ventilators and window trickle ventilators is a cost-effective, non-mechanical means of introducing fresh outside air into habitable rooms.  Easy to operate and fully controllable, natural background ventilators dilute and remove airborne pollutants (including odours) from rooms and control moisture to reduce the risk of mould growths which can be a health hazard to the occupants.

Guidelines to the latest regulations can be found in our background ventilation pages for
England and Wales, Scotland, Northern Ireland and Republic of Ireland.