Slim and adjustable two-part trickle vent offering improved air quality and flow through a property. These vents are offered with 2500mm2 and 4000mm2 equivalent area to suit your needs, and are suitable for new installations, or retro-fitting. Designed and developed in the UK by Yale, one of the world's most trusted brands. Fitting our SlotVent trickle vents will increase airflow, which will reduce likelihood of mould and condensation, reduce water vapour and odour in the air, and do so whilst keeping noise to a minimum. Both the Exterior Hood and Interior Vent are fitted with easy-fit clips, which are made from sturdy ABS material, and supplied white on white vents, and black on all other colours. Whilst the Interior Vent and Exterior Hood are made from ASA Resin, to provide exceptional resistance to weather and UV damage, and longer lasting colour. Why is ventilation important? Document F of the Building Regulations outlines the requirement for adequate ventilation inside homes and other buildings, to prevent damaging excess condensation, and maintain good levels of air quality. Trickle vents are a quick and easy method of providing the necessary ventilation.