Air Cleaner : What is it?
An air cleaner, also known as an air filter, is a device used for filtering the air in a room to remove dust, dirt, and other microscopic particles, leaving safe, clean, and healthy air. It uses a filtration system to remove impurities and particulates in the air. The filter is usually made up of porous paper and a wire mesh screen that effectively traps airborne particles. An air cleaner can be connected to an HVAC system or used as standalone unit.]
Kinds of Air Cleaners include the following:
|High Efficiency Particulate Accumulation (HEPA) air cleaner|
- A HEPA air cleaner is designed to remove up to 99.97% of micron radioactive particles in the air.
- It is commonly used in scientific, military, and industrial applications.
- It can also be used in small residential units.
- It is usually made from smoothly woven glass particles.
- It requires expensive installation, maintenance, and replacement.
- It also requires a strong blowing system to move the air, hence, racking up a high energy cost.
Ultra Low Penetrating Air (ULPA) air cleaner
- An ULPA air cleaner is designed to maintain clean rooms.
- It is commonly used in hospitals and in the semiconductor industry.
- Some models can be used for home applications.
- It uses a filter made with an intercut microfiber web that traps 99.99% of micron particles in the air.
HEPA-type air cleaner
- A HEPA-type air cleaner is used in forced-air and self-contained systems.
- It is as effective as the HEPA air cleaner but has not yet met all its the standards and qualities.
- It has a 25% to 95% efficiency at removing microscopic particles in the air.
- It usually features a treated filter that is more effective when used in forced-air systems.
- This type of filter is disposable and more affordable.
Electret or electrostatic air cleaner
- An electret or an electrostatic air cleaner uses synthetic fibers to create static charges and attract particles.
- It is available in plain and pleated designs.
- It also comes in disposable and reusable formats.
- It requires frequent maintenance and replacement.
- Depending on the brand and model, it can only filter 10% to 35% of microscopic particles in the air.
Electrostatic precipitating or electronic air cleaner
- An electrostatic precipitating or electronic air cleaner is designed to draw in particles by fan then charging them using a series of high-voltage wires.
- It has a precipitating cell or a series of plates that transfers opposite electrical charges to attract particles in the air.
- It is available in whole-house and portable models. The whole-house model is designed to be connected to a cold-air return plenum.
- It removes about 85% of micron particles and almost 95% of bulk dirt.
- It requires expensive installation and maintenance.
Negative-ion air cleaner
- A negative-ion air cleaner features a generator that uses charged needles or wires to create ions or molecules from negative charges.
- These ions latch onto the microscopic particles in the air.
- It uses a fan to distribute the ions into a room.
- However, the negatively charged particles tend to stick to floors, walls, tables, and other flat surfaces and leave stains.
|Clean-air delivery rate (CADR) certification: Choose an air cleaner with a CADR certification to ensure that it has been properly tested by the Association of Home Appliance Manufacturers and recognized by the American Lung Association and U.S. Environmental Protection Agency.|
Efficiency: Choose an air cleaner that is 99% efficient – one that can remove at least 99% of micron particles in the air – to make sure that you are going to get clean, safe, and healthy air.
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