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Atrickle vent is a relatively small opening in awindow or otherbuilding envelope component to allow small amounts of ventilation in spaces intended to benaturally ventilated when major elements of the design—windows, doors, etc.—are otherwise closed.[1][2] Trickle vents are used extensively inEurope and are integrated into window frames to provide minimum ventilation requirements for naturally-ventilated spaces.
The application of trickle vents in naturally-ventilated spaces can help contribute to IEQ Credit 2 under theLEED green building rating system. LEED EA Credit 2 referencesCIBSE Applications Manual 10, which provides advice on the design of naturally-ventilated spaces, recommending the installation of trickle vents in naturally-ventilated spaces. Within the UK, the application of trickle vents is required to meet the requirements of theBuilding Regulations; requirements are described in Guide F, Means of Ventilation.
Trickle vents will help avoid problems associated withpoor ventilation in naturally-ventilated spaces, including reduced risk ofcondensation, avoided over-ventilation (minimizingenergy consumption), and improved comfort through draft avoidance.