Acoustics |
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Noise. |
Air Changes per Hour |
ACH |
Air Changes per Hour (ACH) is a measurement of how many times the air within a defined space, such as a room or building, is replaced with outside air in one hour. |
Air Exchange Rate |
AER |
The Air Exchange Rate (AER) refers to the rate at which outdoor air replaces indoor air in a space, typically measured in air changes per hour. |
Air Leakage |
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Air Leakage is the unintentional loss of air from a building through cracks and openings, which can affect energy efficiency and indoor air quality. |
Air Permeability |
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Air Permeability is a measure of how easily air can flow through a material, often expressed in terms of a specific volume of air passing through a unit area over time. |
Airflow |
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Airflow refers to the movement of air within a space, typically measured in cubic metres per hour (m³/h), cubic feet per minute (CFM) or litres per second (L/s). |
Airflow Rates |
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Measurement of a flow of air through a ventilation unit or duct. |
Airtightness |
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Airtightness describes how effectively a building prevents air from leaking in or out, impacting energy efficiency and comfort. |
Background Ventilation |
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Background Ventilation is a low-level airflow introduced into a space to maintain indoor air quality without causing discomfort. |
Background Ventilator |
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Trickle vent. |
Balanced System |
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A Balanced Ventilation System supplies and exhausts equal amounts of air, ensuring consistent indoor air quality and pressure. |
Building Regulations |
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A minimum standard for design, construction and alteration of buildings. |
Boost |
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High speed fan mode. |
Centrifugal Fan |
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Type of impeller designed to cope with high pressures. |
Carbon Dioxide |
CO2 |
Colourless odourless gas. |
Condensation |
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The point at which air releases moisture. |
Decentralised Mechanical Extract Ventilation |
dMEV |
dMEV is a type of ventilation system that uses individual units to extract air from specific rooms, reducing reliance on a central system. |
Damp |
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An indication/problem with a building fabric. |
Dew Point |
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The point at which water is released by air. |
Dust mites |
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Microscopic mites found in household dust. |
Equivalent Area |
EA |
The aerodynamic measurement of an opening. |
Extractor Fan |
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A unit designed to expel moist stale air from a room. |
Fire Stopping |
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A way of utilising products to prevent the spread of fire. |
Filter |
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Used in some units to filter particle matter from the air. |
Free Area |
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Calculation of an open area of a ventilator or grill. |
Grille |
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A vent used to aid air to or from a dwelling or room. |
Heat Recovery Ventilation |
HRV |
Heat Recovery Ventilation (HRV) systems transfer heat from exhausted indoor air to incoming fresh air, improving energy efficiency. |
Humidity |
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Amount of moisture in the air. |
Indoor Air Quality |
IAQ |
Indoor Air Quality (IAQ) refers to the condition of air within buildings, impacting health, comfort, and productivity. |
Mechanical Ventilation Heat Recovery |
MVHR |
Mechanical Ventilation Heat Recovery (MVHR) systems use mechanical means to ventilate spaces while recovering heat from exhaust air. |
Mechanical Extract Ventilation |
MEV |
A continuous running ventilation system. |
Mould |
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A type of fungus that thrives in damp areas. |
Noise Rating |
NR |
A measurement of noise. |
Purge Ventilation |
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Purge Ventilation involves temporarily increasing airflow to remove pollutants or excess heat from a space quickly. |
Passive Stack |
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A type of ventilation that has no mechanical assistance and relies on atmospheric conditions. |
Positive Input Ventilation |
PIV |
A ventilation system that pushes air into a property to reduce humidity and contaminants. |
Radon |
Rn |
A harmful gas formed underground in rock. |
Resistance |
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Friction caused by ancillaries and components used in ventilation. |
Sick Building Syndrome |
SBS |
Sick Building Syndrome (SBS) describes a situation where building occupants experience health issues linked to time spent in a building, often related to poor ventilation. |
Single Room MVHR |
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Single Room MVHR systems provide mechanical ventilation and heat recovery for individual rooms, often used in retrofitting projects. |
Shock Ventilation |
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Shock Ventilation refers to a brief but intense increase in ventilation rates to rapidly improve indoor air quality. |
Stoßlüften |
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Stoßlüften is a German term meaning “shock ventilation,” referring to the practice of opening windows wide for a short time to quickly refresh indoor air. |
Trickle Rate |
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The Trickle Rate is the minimum airflow rate provided by ventilation systems, ensuring a continuous supply of fresh air. |
Trickle Vents |
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Background ventilators – normally fitted in windows. |
Ventilation |
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Replacement of moist stale air with fresh air. |
Ventilation Rate |
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Ventilation Rate is the measure of how much air is supplied to or removed from a space over a specific period, crucial for maintaining indoor air quality. |
Whole Dwelling Ventilation |
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The continual ventilation rate within a dwelling. |
Whole Dwelling Extract Ventilation |
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A higher extraction rate of air to remove humid stale air. |
Wireless |
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Radio controlled operation of boost or fan speed. |