subject: Understanding MERV Ratings And CADR For Air Filters [print this page] Understanding MERV Ratings And CADR For Air Filters
The subject of air pollution comes up frequently when assessing health and indoor environments. Air pollution extends beyond large issues like smog, industrial pollution and ozone layer depletion. Air pollution can start right at home, in your local office and other buildings we frequent on a regular basis.
Indoor air pollution contributes to the global challenge of disease by as much as 2.7%. There are ways to lower pollution and increase air quality for everyone in practical ways. Don't let the difficult language that's often attached to the subject of air pollution deter you from understanding the important aspects on the issue and what you can do to help.
Air Purifiers Are Effective Tools
Air purifiers are a part of a viable solution that can be used on a practical basis to keep home air cleaner. These filters work to trap agents in the air like dust mites, pet dander, cockroach parts are more. Air filters work in a straight forward way. They actively trap pollutants in the air based on size.
The performance of your air filter can actually be measured to determine effectiveness in your space. The method is the MERV rating. Following the output on a merv rating chart is a comprehensive way of understanding how well your filtration system is actually working.
Portable Air Filters Ratings
Smaller filtration devices efficiency is not calculated using the MERV system. They can be given a CADR ( clean air delivery rate) to determine their functioning prowess. Filters are tested in a room the same size. This test is used to determine how well small filters clean or reduce tobacco smoke, pollen and dust in a given area. There are separate ranges for each of these pollutants. Filters with the higher number perform better. They are as follows:
1) Tobacco Smoke 10 to 450 CADR
2) Pollen 25 to 450 CADR
3) Dust 10 to 400 CADR
Limited Functioning
The filters tested do have a limit. Merv ratings will decrease over time. These filters also do not measure the remove of known pollution caused by gases indoors. Appliances like fireplaces and gas stoves contribute to this kind of air pollution. Filters don't remove these particles. Proper ventilation in homes is essential to affecting the quality of air.
Use practical methods of encouraging air exchange in and out of your home. Air filters will give your efforts a boost but should not be seen as a cure all. Refer to the merv rating chart for a closer look.
Replacing Filters in a Timely Fashion
Change the air filters in your home. After making progress to keep the air clean in your space, maintain your progress. Don't exceed the recommended time frame between replacements. Pollutants can be introduced back into the air if filters become too full with trapped particles.
Protect your air by replacing filters before the suggested time period. Airing out homes and using air filters in tandem can help keep irritating pollutants down in the air around you. Reduce your chances of disease and irritation by filtering the air in your home or office.
