How to Improve your home ventilation 

1. Install a Fresh Air Inlet Vent in the Window

Many houses and apartments lack fresh air intake — which is half of the ventilation system — and in many cases, it’s missing completely. Sometimes, opening a window is the only way to achieve air exchange.

With the Sarne Aa fresh air solution, air is drawn through the outer sash of the window into the space between the panes, where it warms up before entering the indoor space. This makes it easy to turn an existing window into a fresh air window. In this setup, cold outside air is preheated using the window’s natural heat loss.

The air flows indoors through an opening milled into the upper frame of the inner sash. The airflow can be adjusted with a slot vent mounted over the opening. The vent can be adjusted steplessly and directs the incoming air upward, preventing any draft sensation. When the fresh air is directed upward, it is further warmed by the warmer air near the ceiling. Returning the warm ceiling air to the occupied zone also acts as an energy-saving form of heat recovery.

The Aa slot vent is the only window-mounted air inlet vent that filters out even the smallest pollution particles considered most harmful to health. Compared to other window-mounted solutions, the larger filter surface of the Aa fresh air window vent improves airflow capacity.

A slot vent and proper ventilation are discreet but essential for both human health and the well-being of the building.

Benefits of the Sarne Aa Slot Vent:

• Easily converts an existing window into a fresh air window, where cold outdoor air is warmed before entering the indoor space.

• Brings in fresh air draft-free and energy-efficiently by using the window’s heat loss and directing air upward.

• Delivers exceptionally clean air. The filter fully blocks pollen and street dust particles and very effectively filters fine particles from traffic and wood combustion.

• Fresh air enters without letting in outdoor noise.

• No changes are needed to the building’s façade.

• Installation is clean and effortless for residents — no dust or noise indoors.

• The only maintenance is filter replacement, which is quick and tool-free.

• The vent is clean and unobtrusive in appearance.

• The Aa slot vent is the most affordable way to provide controlled, clean, and quiet incoming air.

• (Repeated for emphasis) The Aa slot vent is the most affordable way to provide controlled, clean, and quiet incoming air.
   

The Sarne Aa fresh air window vent is available in four different lengths. As a rule of thumb, the longest possible vent that fits the window should be installed to ensure sufficient air intake. The vent opening can always be adjusted smaller if needed.

If the apartment has no fresh air vents and the windows have no ventilation hatches, the simplest, most affordable, and cleanest way to introduce fresh air is the Sarne Aa slot vent.

2. Velco VLR-100 Fresh Air Inlet Solution

For new wall penetrations

Fresh air inlet vents are needed to bring outdoor air into living spaces whenever a building has natural ventilation or mechanical exhaust ventilation. The operation of the Velco fresh air inlet vent is based on a wax thermostat that functions through thermal expansion. The vent opens and closes steplessly according to temperature, within the range of +10°C to -5°C. At temperatures above +10°C, the vent is fully open; below -5°C, it is at its minimum opening. The Velco vent requires no electrical installation, as it operates purely on physical thermal expansion.

Velco inlet vents are equipped with highly efficient filters that block 100% of pollen and very effectively prevent harmful fine particles from entering indoor air. The filters are made from material, which offers superior filtration thanks to electrostatically charged fibers. These charged fibers attract and trap even microscopic particles tightly within the filter. 

Velco inlet vents are installed in all bedrooms and living rooms. This allows incoming fresh air to flow through the living spaces and exit via exhaust vents located in the kitchen, bathrooms, and walk-in closets. The recommended number of inlet vents should match the floor area: one vent per 20 m². It is important to have enough vents relative to the size of the apartment, as too few can create an uncomfortable draft.

With the Velco VLR-100, bringing fresh air into your home is easy. It is suitable for all types of buildings with natural or mechanical exhaust ventilation and is designed to be installed in a new wall penetration.