Archives: Definitions

Thermal conductivity is a material property that quantifies the rate of heat transfer through a unit thickness of a material when there is a temperature difference of one degree between…

Year-round ventilation refers to ventilation systems designed to operate effectively in all seasons, maintaining comfortable indoor conditions regardless of external weather conditions. These systems ensure a consistent supply of fresh…

Zoning refers to the practice of dividing a building into distinct areas or “zones” that can be independently controlled for various functions, such as ventilation, heating, and cooling. This approach…

Positive Pressure Ventilation is a system that introduces fresh air into a property to reduce humidity and contaminants, rather than extracting air. Also known as Positive Input Ventilation (PIV), these…

The Venturi Effect refers to the phenomenon where a fluid’s velocity increases as it passes through a constricted section of a duct or pipe, resulting in a corresponding decrease in…

Converting your attic into a bedroom? Planning a basement home office? Under UK law, getting your ‘habitable room’ classification wrong could invalidate planning permission and cost you £10,000+ in remedial…

A wet room is defined as a room used for domestic activities that produce significant amounts of airborne moisture, such as cooking, clothes washing, and bathing. Examples include kitchens, utility…

A duct, or ducting, is a pipe or conduit that facilitates the movement of air, specifically extracted air, away from an extraction zone, such as kitchens or bathrooms. Ducting is…

The Domestic Ventilation Compliance Guide (DVCG) is a crucial document in the UK house building and retrofit sectors, providing comprehensive guidance on the installation and performance of ventilation systems in…

Decentralised Mechanical Ventilation (DMV) refers to a ventilation system in which individual units are installed in each room of a building, as opposed to a centralised system that relies on…