The requirement for clean air in schools, the workplace and the hospitality sector has seen the demand for HEPA filtration and Air purification grow over the last couple of months as air purification units will help reduce airborne contaminants, oders and mites.

Air purifiers are ideal for use in the home as well as school and the workplace.

What is a HEPA filter?


HEPA stands for High Efficiency Particulate Air filtration.
HEPA filters can be found in your vacuum cleaners depending on your machine, Air conditioning units, Hospitals and even aircraft. HEPA 13 and 14 are the highest standard and considered medical grade filtration. HEPA filters will remove 99.99% of contaminants 0.3 micrometre or bigger.

What is CADR?

CADR stands for Clean Air Delivery Rate.
The CADR Is a certified rating measurement for air purifiers efficiency. The CADR rating measures the cubic feet per minute which separates scores for cigarette smoke, pollen and dust particles. The higher the CADR rating means the more efficient the air purifier is at the cleaning air.

Check the room size

Air purifiers are available for small to medium rooms 20 - 40 M² or for larger rooms 50 - 100 M² depending on brand. In many cases it’s possible to use 2 medium sized purifiers for a larger room such as two 40M² units for a room that is 75M²
Most air purifiers will have a dust sensor which will give you the quality of air in the room and depending on the brand some will have a built in ioniser. This ensures that dirt and dust particles fall to the floor instead of floating through the air that you breathe.

How to know your CADR from your PM2.5?

Air: Pure air is mixture of gasses containing approximately 78% nitrogen, 21% oxygen and less than 1% carbon dioxide and other gasses.

Air Quality Index (AQI): A unit of measurement to report on the severity of pollution in the air.

Allergen: A substance capable of causing an allergic reaction because of an individual's sensitivity to that substance.

Clean Air Delivery Rate (CADR): It is the fraction of particles (of a particular size distribution) that have been removed from the air, multiplied by the air flow rate (in CFM) through the device. Hence, you may have a different CADR smoke, pollen, and dust.

High Efficiency Particulate Air (HEPA): HEPA filters capture variously sized particles within a multi-layered netting usually made out of very fine fiberglass threads

Indoor air quality (IAQ): The air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants.

Micron: A micron is one-millionth of a metre or one twenty-five thousandth of an inch.

Parts per million (PPM): The number of units of mass of a contaminant per million units of total mass.

Particulate Matter (PM): Solid or liquid particles of soot, dust, smoke, fumes, and aerosols.

Particulate Matter less than 10 microns (PM10): Tiny solid or liquid particles of soot, dust, smoke, fumes, and aerosols. The size of the particles (10 microns or smaller) allows them to easily enter the air sacs in the lungs where they may be deposited and result in adverse health effects. PM10 also causes visibility reduction and is a criteria air pollutant.

Particulate Matter equal or less than 2.5 microns (PM2.5): Ultra-fine particles, or PM2.5, pose an increased health risk over PM10 because PM2.5 can deposit deep in the lung and contain substances that are particularly harmful to human health.

Volatile Organic Compounds (VOCs): Compounds that vaporize (become a gas) at room temperature. Common sources include housekeeping and maintenance products, and building and furnishing materials.

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