Part F1 of the Building Regulations 1995 recommends controllable trickle ventilation for all new buildings and refurbishments requiring planning permission in order to combat condensation.
The recommendations are:
Domestic Building: Habitable Room - 8000mm2; Other Rooms - 4000mm2.
Non Domestic Building (without mechanical ventilation): Occupiable Rooms and Rest Rooms - 4000mm2/10M2; Common Spaces - No Requirement; Other Rooms - refer to regulations but secondary glazing not normally supplied.
Trickle ventilators can be fitted within an enlarged timber sub frame (typically 45mm-50mm depth) and are normally fitted at the head of the window.
Ventilators will reduce the level of noise insulation and where high levels of noise exist wall mounted acoustic ventilators may have to be considered.
Under no circumstances should secondary glazing block permanent ventilation provided for gas appliances, refer to Gas Safety (installation and use) Regulations 1994.
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Guidance