Archives: Definitions

Damp

Damp refers to the presence of moisture within a building or structure, which can lead to various forms of damage and health risks. Key aspects include moisture build-up and moisture…

Resistance

Resistance in the context of ventilation systems refers to the friction or opposition to airflow caused by various components and accessories used within the system. This includes elements such as…

Daylight Factor

The daylight factor is a quantitative measure of the amount of natural light that reaches a specific point in a room, expressed as a percentage. It is calculated by comparing…

Decent Homes Standard

The Decent Homes Standard is a regulatory framework established in England and Northern Ireland, aimed at ensuring minimum quality standards for social housing. Introduced in the early 2000s, it is…

Heat Recovery Unit

A Heat Recovery Unit (HRU) is a device designed to recover heat from exhaust air in ventilation systems, particularly in Mechanical Ventilation with Heat Recovery (MVHR) systems. It is constructed…

Heat Exchange Unit

A device manufactured from thermo-conductive materials that facilitates the transfer of heat between two or more fluids without mixing them. Heat exchange units are commonly used in Mechanical Ventilation with…

Latent Heat of Vapourisation

Latent heat of vaporisation refers to the energy absorbed by a liquid when it evaporates or released when it condenses. This thermodynamic principle describes the transition of substances between liquid…

On-demand Ventilation

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

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…