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A trickle vent is a small opening in a window or other building envelope component to allow small amounts of ventilation in spaces intended to be naturally ventilated when major elements of the design - windows, doors, etc., are otherwise closed. Trickle vents are used extensively in the UK and Europe and are integrated into window frames to provide minimum ventilation requirements for naturally ventilated spaces.
Energy efficiency ratings
The application of trickle vents in naturally ventilated spaces can help contribute to IEQ Credit 2 under the LEED green building rating system. LEED EA Credit 2 references CIBSE 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 the Building Regulations, requirements are described in Guide F, Means of Ventilation.
Effect on indoor environment
Trickle vents will help avoid problems associated with poor ventilation in naturally ventilated spaces, including reduced risk of condensation, avoided over ventilation (minimizing energy consumption), and improved comfort through draft avoidance.
The US Standard, ASHRAE 62.1-2007: Ventilation for Acceptable Indoor Air Quality, only requires 4% of net floor area to be operable. This creates the potential for increased energy consumption where natural ventilation is provided by operable windows where supplemental air conditioning is provided, in addition to generally poor control over ventilation rates during hot summer or cold winter conditions.
- Derek Clements-Croome (November 2002). Naturally Ventilated Buildings: Building for the Senses, the Economy and Society. Routledge. pp. 173–. ISBN 978-1-135-81587-5.
- "Trickle Vent Fireplace Allure". Archived from the original on June 25, 2017. Retrieved June 25, 2017.
- "Jeff Howell: do my windows need to have trickle vents?". Retrieved 25 June 2017.
- Crafti, Stephen. The Ultimate Urban Makeover: Unique Architectural Renovations. Images Publishing, 2007. ISBN 1-86470-171-4.