You’ve probably experienced the feeling of confusion when trying to select the correct home air filter for your needs. Which brand is best? Is the more expensive products worth the investment? These are just a few of the questions that make purchasing air filters for your home mind-boggling. Let San Antonio Air Service Experts crack the code of home air filters for you, so you can feel comfortable with your purchase.
Here’s a tried and true way to figure out how efficient your old filter is (NOTE: Spare yourself a huge mess by conducting this experiment outside or with something below the filter to help keep things clear): Set the filter horizontally, then using everyday table salt, start pouring the salt through the filter then see the quantity that comes out the other side. If some or all the salt falls through the filter, then you can imagine that the filter will let dust particles of similar size pass through. You should probably upgrade your filter to something more efficient.
Size, MERV rating and material – these are the three primary factors used to pick the proper air filter for your home.
1) Filter Size
Unless you have the proper size home air filter, you will never enjoy the full effectiveness your system and filter can provide. Simply look at the label of your existing filter to see the proper measurements, or just measure it yourself. Most home air filters are 1” thick, but there are a number of standard width and height dimensions, and some systems have thicker filters.
2) Material & MERV Rating
MERV ratings are the efficiencies of the filter on a scale of 16. MERV stands for Minimum Efficiency Reporting Value. This number informs the user, under the least efficient conditions, how well the filter is designed to trap contaminants.
To explain MERV ratings more impactfully, these are some usual MERV ratings and how they connect to efficiencies. This is only a guide, so be sure to read the filter manufacturers’ information when purchasing specific filters.
Rating Average Filtration Efficiency
MERV 1-4 60-80%
Fiberglass, Disposable Panel, Washable metal/synthetic, self-charging (Passive)
MERV 5-8 80-95%
Pleated, Media panel, Cube
MERV 9-12 >95%
MERV 13-16 >98%
Be Careful About High MERV Ratings
While a higher MERV number may offer better filtration efficiency, it is critical to understand that too high a MERV filter may also take more to operate your heating and air conditioning system. The higher the MERV, the less the air may flow through the system, and the harder the system may need to work. Your objective should be to get the right balance between air flow, air filtration level and energy efficiency.
Consider it this way, the most efficient ‘filter’ would actually be a piece of plywood that would just trap ALL contaminants and all the air from getting into your San Antonio home. That's definitely the “best” air filtration, but would also be like living in a box.
The default choice for most systems would be a MERV 6-8. A higher MERV filter should be used based upon the advice of your San Antonio Air Service Experts service advisor to verify your system has the capability of moving the suitable volume of air through higher efficiency filters. You probably do not want to give up energy-efficiency for filter efficiency; you want a balance of the two. However, if your family has allergies or respiratory problems and a high MERV rated filter is required, consider a whole-home air filtration solution that will achieve your energy and filter efficiency needs.
Filtration has changed significantly over the past few years. Originally, home air filters were used in the furnace or air handler only to safeguard the comfort equipment itself. Today it’s a whole new ballgame. San Antonio area homeowners expect their air filter to save loved ones from a wide variety of harmful pollutants, dust mites, and even prevent the need for dusting. Dare to dream!