5 Things To Check Before Buying Hepa Air Purifiers


Buying an air cleanser to counter the high polluting of the environment levels? This air cleanser buying guide aims to assist you take an educated decision.

Buying an air cleanser is tricky. With no industry standards in place in India, individuals are susceptible to the brands. The prices of air purifiers can vary from ranging from Rs 8,000 and Rs 1 lakh. There are lots of factors to consider before buying an air purifier. It’s very important to undergo the specifications of every model and not blindly believe the sales executive. This buying guide aims to assist you to take an educated decision.

Things to remember first

Prior to heading off to buy an air cleaner, note the annotated following:

  1. Note how big the space (preferably in square metres) in which you want to install an air purifier
  2. Note that portable home air cleaners are supposed to cater to only 1 room
  3. Avoid Ionizers, UV light-based models. These electronic home air cleaners release ozone as a byproduct which may have negative effects.
  4. The cost of replacing air filter and electricity costs must be kept in mind. For best results, air purifiers should be kept running always.

Certifications to bear in mind

  • There are two standards- AHAM (American) and China certification- which are taken seriously in the industry. Most air purifiers that are available in India don’t have any of these certifications. Both the certifications ensure the absolute minimum quality and gratification standard for an air purifier model.
  • Some popular AHAM Verifide brands are Blueair, Bosch, Electrolux, Honeywell, LG, Philips, Sharp, Whirlpool amongst others. Keep in mind that all models because of these brands might not be certified.
  • Some brands like Xiaomi follow Chinese GB/T 18801 air cleanser standard.

Style of Filter

  • The product quality and form of filter determines the effectiveness of an air cleaner. Specific filters target different components of air. The most commonly available filter type is HEPA (High Efficiency Particulate Air). It could filter most (up to 99.9%) air borne particles of small sizes of up to 0.3 microns. For general usage, HEPA filters get the job done.
  • Some brands provide ultrafine particle filter combined with HEPA filter to a target particles even finer than 0.3 microns (Divide a hair strand into 240 pieces plus the width of just one such piece is equivalent to 0.3 microns). Remember that HEPA filters try not to remove odour.
  • To focus on odour, you’re going to have to decide for an activated carbon filter over the regular HEPA filter combination. There are numerous forms of activated carbon filters. Some of them are light mesh-like which prevents cooking odours. Having said that, some filters offer activated carbon pellets which could remove gaseous and chemical odours.
  • Some brands even enable you to customise the filter as per your requirement.
  • Air purifier filters do not kill air borne germs and bacteria generally speaking. You can easily be aware of filters with antibacterial coating. However, avoid UV light-based models.
  • Few air cleanser models offer a washable pre-filter to fully capture dust along with other large particles. Choose for a model with pre-filter as it advances the expected life of this filter inside.


  • The performance of a specific air cleaner model is rated by its coverage area, Clean Air Delivery Rate (CADR) and Air Changes Per Hour (ACH). While brands will boast about the CADR and coverage of a specific air cleaner model, they will decide to remain silent in the ACH. This really is something you should ask and find out before buying an air purifier.

What is ACH?

  • Air Changes each hour (ACH) is basically how many times an air purifier can clean the atmosphere of its claimed coverage area in one hour. This is important because pollutants constantly enter your living space in addition to air cleanser has to constantly clean the air. Because of the pollution levels in Delhi, go for an air purfier that provides 4 ACH. This implies the atmosphere purifier can perform washing the air of the entire claimed area four times in one hour or every 15 minutes the air inside is completely replaced.
  • The catch let me reveal brands have a tendency to hide the ACH rating while showcasing an increased coverage area and CADR. If an air purifier can cover more square feet however if its ACH is around a few, then it will likely be less effective. Some brands like Blueair offer 5 ACH.

Other items to notice:

  • Price of replacement filters and their lifespan. Filters usually cost when you look at the selection of between Rs 1,500 and Rs 2,500 with a lifespan of approximately 6 months. Also, do not forget to check into the accessibility to filters.
  • Considering electricity costs, make an effort to search for an air cleaner with energy star ratings.
  • Noise levels should always be around 35 decibels if the fan is running at the top speed. Usually do not opt for models with above 55 decibels rating. It is often disturbing while sleeping.