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Frequently Asked Questions

Indoor Air Purifiers

Air purifiers are one of the best ways to remove indoor air pollutants & clean your indoor air quality.
Passive filtration technology and Active filtration technology.
Passive filtration technology is age old and one of the safest technologies used in an air purifier. Air purifiers with good particulate filtration ensure that no particles come through in the air that is released from the purifier. These are more expensive because the filters need to be changed regularly. These machine filters simply block pollutants in the filters and allow the passage of clean air.
Active Purifier technology is primarily used these days. The filters here send out charged ions in the air i.e. chemically, change the molecular structure of the pollutants in the air, in the process, creating by-products of the very pollutants they are removing. Simply put, this technology plays with nature. Quite a lot of these cost effective air purifiers use some type of active filteration technology. These remove basic odours well, but are not capable of removing harmful gases like nitrogen dioxide, formaldehyde & other VOCs.
Ideally air purifiers for homes should be bought having passive filteration technology.
Ideal parameter and features to be looked at are:
  1. Clean Air Delivery Rate (CADR) at a medium spead, where the noise level is acceptable and not high – it should be able to provide for atleast 2 air changes in one hour.
  2. HEPA filter quality: A good quality hepa filter is an important factor to consider. A true Hepa filter should be of H12 or H13 grade.
  3. Carbon filter: A good quality carbon filter weighing 500 grams or above.
  4. Pre-filter: a good washable pre-filter to take care of larger particles.
  5. Noise levels: Below 50 dB, at medium speed, should be acceptable.
  6. Indicator for filter change.
  7. Air quality indicator (PM2.5 / PM 10, CO2, etc).
Clean Air Delivery Rate (CADR) can be calculated by measuring the volume of air of the room and dividing by CADR at medium spead. Ideally it should be minimum 2.
HEPA (high-efficiency particulate air) filters capture particulate polluttants like PM 2.5, dirt, dust, pollen, viruses, moisture, bacteria. HEPA filters are the most important part of any air purifier and a key to clean air.
Carbon filters are used to remove odours & gases. They combat Volatile Organic Compounds (VOCs), like formardehyde. These are hazardous gases that normally pass through a HEPA. Activated carbon filters react with these hazardous gases to remove them from the air.
An activated carbon filter is effective at removing odours. They remove smells from tobacco smoke, pets, food, garbage etc.
On average, your air purifier would take 20 to 40 minutes to purify the air in a room. You should notice a difference in the room air quality after 20 minutes with a running air purifier.
The higher the speed of your air purifier, the more air it will take in and clean, because the speed of the fan inside the machine decides how many cubic feet of air per minute goes in through the machine or how much air it is able to clean. Once the air if clean, you can turn it to medium or low with reasonable noise levels.
Yes. When you have an air purifier running, it is essential that you keep your doors and windows closed just like when the air conditioner is running.
The best air purifier for someone with asthma is one with both a HEPA filter and an activated carbon filter. An air purifier with both filter types will remove particles and gaseous pollutants that can cause asthma.
No. Air purifiers prevent asthma symptoms and allergies by filtering out airborne allergens like pollen, dust, and animal dander. Purifiers are more of a preventive measure.

For any air purifier to be effective, it has to move the air. As such, there is no way to do this silently. However, with most air purifiers, there is a noise level setting that can be adjusted based on preference.

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Know Your Home Air

Gas heating systems, leaking chimneys, fire places emits carbon monoxide, nitrogen dioxide and other harmful pollutants. Plastics and common household cleaners, paints, paint thinner often placed under the kitchen sink, release Volatile Organic Compounds (VOCs), when used and stored. Overheating of non-stick cookware releases toxic fumes. Pesticides we use in and around the home also release various chemical and semi-volatile compounds.


Harmful effects
Carbon monoxide causes headache, dizziness and fatigue. These often cause eye, nose, and throat irritation, nausea, and can also damage the liver, kidney, and central nervous system. Fine particles are produced during all kinds of combustion which lead to acute and chronic effects to respiratory and cardiovascular systems.

Pet dander and hair, carpet, rugs, upholstery furniture are main source of dust mites, fungus, and bacteria. A dirty filter of air conditioners acts as a reservoir for dirt, dust and other airborne contaminants that are continuously circulated back into your breathing air. Secondhand smoke from cigarettes, other tobacco products and mosquito coil emits VOC’s and formaldehyde and various particulate matters. CO2 released from our lungs is exhaled in the air which pollutes the air if the place is too crowded or there is less ventilation.


Harmful effects
All these can trigger coughing, nosebleeds, shortness of breath, dry mouth, vomiting,
digestive tract problems, depression, allergy and asthma attacks, and other respiratory illness.

Shower, faucets and other water sources are main cause of humidity and mold. Bathroom cleaners and personal care products like toothpaste, soaps, facial tissues, detergent, fabric softeners, air fresheners, deodorizers, hair sprays, disinfectants, are full of VOC’s and chemicals which emits harmful pollutants.


Harmful effects
Mold can cause allergic reactions, asthma and other respiratory ailments. VOC’s and toxic chemicals released in the bathroom can causes eye, nose, and throat irritation, nausea and respiratory problems. All these products release harmful pollutants while they are used also when they are stored.

A bedroom contains many sources of indoor air pollution. Mattress, pillow and blankets, soft toys, are the reservoirs of dust mites, fungi and bacteria. Furniture, carpets, paints and beauty product like hairspray, nail polishes, perfumes, deodorants etc off gas VOC, formaldehyde and toxic gases into the air.


Harmful effects
These pollutants make the air unhealthy which leads to allergy, asthma attacks, dizziness, headache, fatigue and other respiratory ailments.

Second-hand smoke
Second hand Smoke is a mixture of the smoke given off by the burning of tobacco products, such as cigarettes, cigars or pipes and the smoke exhaled by smokers. Secondhand smoke is also called environmental tobacco smoke (ETS). Passive smoking can lead to coughing, excess phlegm, and chest discomfort. NCI (National Cancer Institute) also notes that spontaneous abortion (miscarriage), cervical cancer, sudden infant death syndrome, low birth weight, nasal sinus cancer, decreased lung function, exacerbation of cystic fibrosis, and negative cognitive and behavioral effects in children have been linked to ETS. Secondhand smoke exposure commonly occurs indoors, particularly in homes and cars. Secondhand smoke can move between rooms of a home and between apartment units.

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Central heating and cooling systems and humidification devices
The air filter in your HVAC system is the front line of defense against poor indoor air quality. A typical central heating and cooling system circulates over 1,000 cubic feet per minute of air through the filter. This means the entire air volume in your house passes through the filter multiple times every day. A dirty filter, however, can actually make indoor air quality worse by acting as a reservoir for dirt, dust and other airborne contaminants that are continuously circulated back into your breathing air. In addition to driving up your utility bill, a clogged air filter will allow all that dust and debris that should be filtered out to be re-circulated back into your home. This can cause chronic allergies and especially be dangerous for people with asthma or other respiratory conditions.

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