Quieter and less draughty ventilation Slim and adjustable twopart 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 retrofitting. Designed and developed in the UK by Yale one of the worlds 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 . Features & Benefits Variable ventilation adjustable interior vent Reduces noise and draughts integrated foam gasket Hardwearing strong weather UV colour fade resistance Prevents water ingress overhanging exterior hood Stops flies and bugs features builtin fly screen Improves air quality Document F compliant Easyfit locking clips just clips over frame or sash slot Longlasting 10 year guarantee ...