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Ventient by AWS allows for ventilation when windows are closed.

Ventient trickle vent by AWS

The Ventient solution incorporates trickle ventilation technology into the AWS range of residential and commercial windows and doors.

A trickle vent is a very small opening in a window that allows small amounts of ventilation when windows are otherwise closed. This innovative unit, which requires no battery or mains power, incorporates a bi-metal spring that allows natural ventilation based on the outside air temperature. Ventient balances the need to maintain good insulation with the desire to have clean, healthy spaces. It’s designed to maximize the efficiency of the building envelope.