Archives: Definitions

Velocity refers to the speed at which air travels through a duct or ventilation unit. It is usually measured in metres per second (m/s) and is critical for ensuring adequate…

A trickle vent is a small opening or device installed in windows or walls to allow for controlled passive ventilation. It enables a continuous flow of fresh air into a…

Whole House Ventilation refers to a systematic approach to ensuring a consistent and controlled flow of fresh air throughout an entire dwelling. This method is essential for maintaining indoor air…

Whole Dwelling Ventilation refers to the systematic approach of ensuring a consistent and balanced airflow throughout an entire residential property. This method is critical for maintaining indoor air quality, controlling…

Whole Dwelling Extract Ventilation (WDEV) refers to a system designed to remove stale, humid air from all areas of a residential building. This ventilation method is crucial in maintaining indoor…

Volatile Organic Compounds (VOCs) are a group of organic chemicals that can easily evaporate at room temperature. They are colourless and odourless gases released from a variety of household products,…

HRV systems transfer heat from the stale air being expelled from a building to the fresh air entering it, improving energy efficiency. This process helps to maintain comfortable indoor temperatures…

MVHR refers to a specialised ventilation system that extracts stale air from a building while simultaneously introducing fresh air from outside. The innovative feature of MVHR systems is the heat…

Single Room MVHR (Mechanical Ventilation with Heat Recovery) Systems Single room MVHR systems are increasingly recognised as essential components for maintaining indoor air quality, especially in modern, energy-efficient homes. These…

Sick Building Syndrome (SBS) is a condition in which building occupants experience a range of nonspecific symptoms that improve or resolve upon leaving the building. These symptoms can include headaches,…