Modern construction standards featuring improved insulation and enhanced airtightness have made natural ventilation through traditional air bricks increasingly insufficient. Without consistent airflow, subfloor spaces become vulnerable to serious problems: wood rot that compromises floor structures, mould growth that degrades indoor air quality, and the accumulation of harmful ground gases such as radon.

Over time, these hidden issues can result in costly structural damage and negatively impact occupant health. Mechanical subfloor ventilation provides a reliable, controlled solution that works regardless of external conditions, ensuring the spaces beneath your building remain dry, healthy, and structurally sound.

The Mori WMF subfloor fan delivers effective mechanical ventilation in both extract and supply configurations, allowing you to choose the most appropriate strategy for your project. Engineered for performance and simplicity, it provides up to 17 l/s airflow to actively control moisture and maintain healthy subfloor conditions. The externally mounted design simplifies installation and maintenance, particularly for retrofit applications, while the integrated controller offers continuous trickle ventilation with an optional boost function.

The diagram shows an example setup of the MORI WMF installation.

This diagram is conceptual only. It should not be considered a design for any particular sub-floor ventilation system. Design responsibility rests solely with the system designer.