Trickle vents
Proper air circulation inside a building is the foundation of a healthy indoor climate and effective protection against moisture buildup in walls. Modern, highly airtight window systems require a complementary solution that ensures a supply of fresh air even when the sashes are closed, without causing rapid heat loss. At All Windows Group, we offer advanced window trickle vents that automate the ventilation process by responding to changes in pressure or humidity inside the home. Thanks to this, air exchange occurs continuously and safely, eliminating the need to leave windows ajar during the occupants’ absence.
Regel-air® FFL
Press Vent
SM 1000
airvent SM HY
EMM HIGRO®
Types of trickle vents and the efficiency of natural ventilation
The selection of the right device should be based on the building’s characteristics and the type of exhaust ventilation system. A properly chosen vent not only prevents mold formation but also significantly improves acoustic and thermal comfort indoors.
Airflow automation: Pressure-controlled and humidity-controlled vents
Modern ventilation systems aim to minimize user intervention in the airing process.
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Humidity-controlled vents (e.g., airvent SM HY or EMM HIGRO®) are the most advanced solutions, using a polyamide strip sensor. This mechanism automatically adjusts the opening size of the vent depending on the relative humidity level in the room—the higher it is (e.g., during cooking or bathing), the more fresh air is supplied.
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Pressure-controlled vents (e.g., Press Vent) respond to differences in pressure between the interior and exterior. During strong wind gusts, airflow is limited, preventing drafts and uncontrolled heat loss.
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Acoustic-insulated versions are designed for buildings located near busy roads. Special sound-dampening inserts in models like EMM HIGRO® can reduce noise by up to 40 dB, ensuring the vent does not become a weak point in terms of sound insulation.
Discrete and manual solutions
For those who value clean aesthetics, we offer systems that have minimal visual impact on the window frame.
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Rebate vents Regel-air® FFL are installed in the upper part of the frame and remain completely invisible when the window is closed. They operate based on pressure differences and do not require large milling openings in the profile.
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Manual vents (e.g., SM 1000) give the user full control over the opening level. Made of durable aluminum, they are resistant to mechanical damage and are ideal for public buildings or rooms with a fixed function.
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A wide range of colors (RAL, anthracite, black, caramel) allows for perfect matching of the vent housing to the window profile, making it a cohesive part of the joinery.
FAQ – Frequently asked questions about trickle vents
Trickle vents are designed so that incoming air is directed toward the ceiling, where it mixes with the warm air accumulated in the upper part of the room. Automatic models (pressure- and humidity-controlled) limit airflow at low temperatures or during strong winds, minimizing heat loss.
According to building standards, trickle vents are installed in the upper part of the window (in the frame or sash). This placement ensures optimal air circulation without creating drafts at occupant level and prevents pollutants from entering at ground level.
The number of devices should be adjusted to the room volume and the capacity of exhaust grilles in kitchens and bathrooms. Typically, vents should be installed in every bedroom and in the living room to ensure fresh air supply where occupants spend most of their time.
Most models, such as SM 1000 or EMM HIGRO®, allow manual closing. However, for safety reasons (especially in rooms with gas installations), vents maintain a minimum airflow that cannot be fully blocked to ensure basic ventilation.
Maintenance is limited to periodically wiping the housing with a dry cloth and vacuuming the air intake openings. The interior of the vent must not be cleaned with water or aggressive detergents, as this could damage the sensitive humidity-control mechanisms.