On-demand ventilation refers to a ventilation system that operates based on the immediate needs of the indoor environment, primarily influenced by factors such as humidity levels, occupancy, or the presence…
Intermittent ventilation refers to a mechanical ventilation system that operates only during specific periods of increased indoor air pollution or humidity, rather than running continuously. This type of system is…
An inline fan is a type of ventilation fan that is installed within the ductwork of a ventilation system rather than in the room from which it extracts air. These…
Infiltration refers to the uncontrolled entry of outdoor air into a building through cracks, gaps, and openings in the building envelope. This phenomenon occurs without the intention of the occupants…
In UK residential construction and retrofit contexts, stale air describes degraded indoor air quality resulting from insufficient ventilation. This condition manifests through measurable pollutant accumulation: CO₂ Concentration: Frequently exceeds 1,000…
Trickle Speed refers to the low, continuous airflow rate maintained by mechanical ventilation systems to ensure consistent background ventilation. It operates at a minimal level to extract stale air and…
A space not intended for regular occupancy or primary living activities, such as garages, storage rooms, plant/mechanical rooms, or cupboards. Definition A non-habitable room is a designated area within a…
Relative Humidity (RH) is the measure of the current amount of moisture in the air expressed as a percentage of the maximum amount of moisture the air can hold at…
A dwelling is defined as a self-contained unit designed to accommodate a single household. This term encompasses various types of residential buildings, including houses, flats, and bungalows. In the context…
Single Room Heat Recovery (SRHR) is a ventilation system that utilises the heat from stale air being extracted from a room to pre-warm the incoming fresh air. This process not…