What is microventilation in windows?

Microventilation in windows provides a controlled flow of fresh air, enhancing indoor comfort and air quality without compromising energy efficiency. Ventilation is crucial for the comfort and health of building occupants. In energy-efficient buildings, adequate air exchange is increasingly important. Closed and sealed windows, which protect against heat loss, can simultaneously lead to moisture buildup.

Traditional ventilation methods, such as opening windows, are most effective when we want to air out our homes. During winter heating or summer cooling, microventilation in windows proves highly beneficial to maintaining desired temperatures.This innovative method allows for subtle and controlled intake of fresh air without the need to fully open the window.

Microventilation is a system that enables slight opening of the window, even though it appears to be closed at first glance. Thanks to special stickers and positioning the handle in a specific way, it is possible to create a small gap through which air can freely flow.

Image of an open window with fresh air flowing indoors, symbolizing the concept of windows for bringing fresh air into a space.

Definition of microventilation in windows

Microventilation is a solution designed to ensure proper air exchange in rooms with minimal window opening. It involves allowing a small, controlled flow of air through a gap in the window, even when the sash remains closed.

How it works

Special stickers: Windows with microventilation feature a special sticker. It lets the handle position slightly open the window, though it looks closed. This sticker prevents the window from closing fully, allowing a small gap to form.

Sash opening: Microventilation involves gently opening the window sash to create a gap through which air can flow. The window seal is then slightly loosened, allowing for controlled airflow.

Handle positioning: The key element of microventilation is the specific positioning of the window handle. This allows users to position the handle so the window sash opens slightly, creating a small gap.

Differences between full closure, opening, tilt, and microventilation

Full closure:

The window sash is completely closed and sealed, preventing any airflow.


The window is opened to a traditional width, allowing full airflow into the room.


The top part of the window sash tilts away from the frame, creating a controlled airflow gap at the window’s top.


A special handle mechanism creates a small window opening, allowing airflow while the window stays closed.

Microventilation balances comfort, energy efficiency, and fresh air without fully opening windows. It’s popular in modern buildings, ensuring optimal thermal insulation and indoor air quality.

Benefits of microventilation in windows

Microventilation in windows brings several benefits that impact both the comfort and health of occupants and the energy efficiency of the building.

  • Improvement of indoor air quality: Microventilation allows fresh air to circulate in rooms even when the windows are closed. This significantly improves indoor air quality by eliminating unpleasant odors, exhaust fumes, and other pollutants.
  • Prevention of moisture and mold: Regular air exchange prevents moisture buildup. High humidity fosters mold and fungi growth, harmful to health and buildings.
  • Energy savings: Microventilation enables fresh air to flow without fully opening the window, minimizing heat loss associated with window opening. This results in lower energy consumption needed for heating or cooling rooms.
  • Impact on health and comfort of occupants: Fresh air positively affects the health and well-being of occupants, improving concentration and reducing fatigue. Regular air circulation can also reduce the risk of allergies and respiratory problems.

Microventilation in windows

Microventilation is particularly effective in vertical windows found in homes and offices, ensuring fresh air even when closed, maintaining ideal indoor conditions.

This innovative ventilation method provides comfort, energy savings, and enhances health, increasingly adopted in modern residential and commercial buildings.

It allows maintaining optimal indoor conditions while preserving window insulation and minimizing heating and cooling expenses.


In this article, we discussed the essence of microventilation in windows and its benefits and applications.

Key points to remember:

  • Microventilation allows for controlled fresh air flow into rooms even with closed windows.
  • The operation of microventilation is based on the mechanism of positioning the window handle and blocking the full closure of the window sash.
  • Benefits of microventilation include improving air quality, preventing moisture and mold, saving energy, and impacting the health and comfort of occupants.
  • Microventilation can be used in various types of windows, even in climates with significant temperature and humidity variations.

Microventilation innovatively maintains indoor comfort, energy efficiency, and promotes occupant health and environmental protection.