Something about HEPA filter
HEPA stands for High-Efficiency Particulate Air. A true HEPA filter can filter out (trap) particles including bacteria down to size > 0.3um, bacteria and virus are still survive and hold on the filter surface, user need to replace the filter regularly. Remember to check on the cost of filter replacement for the air purifier model that you choose.
Be aware that efficiency and effectiveness are not the same thing.
Efficiency: Only for Hepa filter itself. It is a measure of the ability to remove particles from the air passing through it.
Effectiveness: It is a measure of the air purifier’s ability to reduce airborne particles in an occupied room.
Efficiency depends on both airflow rate through the purifier and on the particulate load.
Effectiveness depends on the amount of air being filtered, and the path the clean air follows after leaving the filter.
HEPA filter could actually be quite ineffective if the amount of air it has to filter is large and the airflow rate low. Plese remember the airflow rate is deducted after 1-2 months of usage.
Filter is a consumable part. In Singapore, high humidity makes a filter become an excellent environment for germs, molds.
Just like if you never wash your air-con filter monthly, the air become smelly and uncomfortable.
We recommend you replace HEPA filter regularly (6 months) to maintain the best result.
Commonly, one set of HEPA filter is around $80 – $150.
When the micro-fiberglass HEPA material leaks, it is dangerous.
The major problem with traditional micro-fiberglass HEPA filters is that they have a relatively fragile filter medium. Not only are they easily damaged through normal handling and have limited shelf life, but the rigors of many pharmaceutical applications can harm them. The medium consists of many small glass fibers held together with an acrylic binder. Any breakdown of the binder or fiber causes leaks or shedding. Damaging agents include handling; in-place contact; vibration; humid environments; exposure to chemicals such as cleaning agents, sterilizing agents, or process chemicals; elevated temperature; and age. – From Filtration and Purification in the Biopharmaceutical Industry, Maik J. Jornitz, Theodore H
Double check the HEPA filter material before you have it.