Supply Ventilation in an Apartment: Options, Pros and Cons

Modern apartments are often sealed with tight windows and insulated walls, which helps save heat but can worsen indoor air quality. Supply ventilation brings fresh outdoor air inside in a controlled way, reducing CO2, odors, and excess humidity while improving comfort. The simplest option is a wall or window air inlet (trickle vent). It is inexpensive, easy to install, and works well when the building’s exhaust shafts function properly. However, airflow depends on wind and pressure differences, filtration is minimal, and in cold seasons drafts and noise may appear. A more advanced solution is a compact “breather” (decentralized supply unit) with a fan and filters. It delivers stable airflow, can include fine filtration for dust and pollen, and is convenient for bedrooms and living rooms. The downsides are higher cost, the need for electricity, periodic filter replacement, and potential fan noise if the device is chosen incorrectly. The most effective but also the most complex approach is a supply-and-exhaust system with heat recovery (HRV/ERV). It balances air exchange, reduces heat loss, and supports consistent comfort across multiple rooms. Still, it requires design, duct routing, space for equipment, and professional installation. When choosing a system, focus on required airflow per room, filter class, noise level at night, outdoor air intake location, and maintenance accessibility. Fontana recommends starting with a CO2 and humidity check: if levels rise quickly, controlled supply ventilation is the fastest path to healthier air.