poistoaukot

Poistoaukko on a space from which air is expelled to the outside, and it is a common element in ventilation systems. In Finnish building terminology, poistoaukko refers to the exterior opening or grille that connects to an exhaust duct or directly to the outside, allowing stale air and moisture to exit a room. The plural poistoaukot is used when speaking about multiple such openings.

Use and placement: Poistoaukot are typically found in bathrooms, kitchens, utility rooms, and other spaces that require exhaust ventilation. They can be part of a mechanical exhaust system (poistoilma) or be passive vents with dampers. Openings may be wall-mounted, ceiling-mounted, or roof-vented, and are usually fitted with a grille or louvre.

Design and components: A poistoaukko system often includes an exterior grille, an interior duct collar, a backdraft damper, and sometimes an insect screen. Weatherproofing and insulation are important to reduce heat loss and drafts. Proper placement should ensure that exhaust does not recirculate into living spaces and that outdoor air intakes are not drawn polluted air from other sources.

Installation considerations: Location should avoid proximity to air intakes, windows, or other exhausts. Exterior openings should be protected against blockage by snow, rain, or debris, and may require flashing and sealing to prevent leaks. In cold climates, frost protection and condensation control are important, and local building codes should be followed.

Maintenance and issues: Regular inspection and cleaning of poistoaukot and grills prevent dust buildup and improve airflow. Check dampers, seals, and insect screens for proper operation. Blocked or damaged openings can cause moisture problems, mold growth, or reduced ventilation efficiency.