The American Society of Heating, Refrigeration and Air Conditioner Engineers (ASHARE) recommends a MERV 6 or higher. Most people go with a MERV 8 filter. Most residential areas can remove contaminants with MERV 8 to MERV 13, while most hospitals use MERV 14 to MERV 20.
Does it matter what AC filter you use?
Most air filters are 1 inch thick, but some systems can accommodate filters 2 to 5 inches thick. In our tests, we found that the thicker the filter, the better it works and the longer the replacement intervals. That means it’s better for you and for your heating, ventilating, and air conditioning (HVAC) system.
What is a good MERV rating for AC?
According to the ASHRAE, the best rating for residential HVAC systems is MERV 13. But before you upgrade your filter, make sure your specific system can accommodate that rating. A higher MERV rating often means lower airflow, which can cause the system to work harder—use more energy—to do its job.
How do I choose an air conditioner filter?
Choosing the Correct Air Filter Check Your Manufacturer’s Guidelines. Your HVAC manufacturer’s instructions will provide important details about the type of filter you should select for your system. Look at the MERV Rating. Compare Disposable and Washable Options.
How often should you change your AC filter?
Newer systems often use pleated filters, also rectangular with a depth of about one inch. You should replace these about every 90 days, if you have no allergies, but AC pros typically recommend every 45 days for max efficiency. Be sure to replace them with the right size and type of air filter.
How do I know what MERV rating to use?
MERV ratings range from 1 to 20, with lower ratings denoting a lower-quality filter. MERV 1-4 Filters: Filters with a MERV rating of 1 to 4 do little to trap harmful particles in your home’s air. MERV 5-8 Filters: MERV ratings of 5 to 8 indicate a medium-quality filter that’s sufficient for most homes.
Is MERV 8 good enough?
MERV 5–8 (good): These filters are better at catching small particles (3–10 microns) like mold spores, hair spray, dust mites and animal dander. MERV 9–12 (better): The best option for residential use.
Is MERV 7 good enough?
For most residential systems, experts suggest using an air filter with a MERV value between 7 and 12. These filters offer adequate filtration and remove common contaminants such as pollen, mold spores, dust, pet dander, and tobacco smoke.
How do I know what size air filter I need without a filter?
Actual Size: The actual size of an air filter is typically written in the fine print on the frame of the filter and is usually 0.25″-0.5″ smaller than the advertised, nominal size. The actual size is what you’d find if you used a ruler to measure the exact dimensions of the filter.
Can I use a 1 inch filter instead of 4 inch?
Question: Can i use a 1 inch filter instead of 4 inches? Answer: If you are okay with more frequent replacement and little stress on the system, 1” filter can be budget-friendly alternative of 4” filters.
What is the most common air filter size?
While there are no standard furnace filter sizes that will fit all models, the most common filter dimensions include: 10 X 20. 14 X 20. 16 X 24. 18 X 30. 12 X 12. 14 X 24. 16 X 25. 20 X 20.
How do I know if my AC filter is dirty?
One clever way to determine if the air filter is dirty is to do the “white sheet test.” This involves hanging a clean white sheet approximately 5 inches away from one of the vents for at least one hour. If the sheet turns gray, you’ve got a filthy air filter. The grayer the sheet, the dirtier the filter.
Why does my AC filter get dirty so quickly?
When your A/C is on the thermostat fan will constantly be running causing air too run over the air filter continuously and causing it to get dirty more quickly. You may have a leak in your air ducts – Leaky air ducts can also cause your filter to clog up and especially if it is near your AC unit.
What happens when you don’t change AC filter?
If you don’t change your AC filter, it will begin to fail. It will no longer be able to filter the air properly, letting dust and contaminants get into the AC. Dust jams the moving parts of an AC such as fan motors and valves. This is how dust makes the unit less energy efficient (at best) and can lead to breakdowns.
What does MERV 16 filter out?
Aprilaire MERV 16 filters can remove up to 99%* of allergy and asthma triggers, including smoke, pollen, mold, and more. As a bonus, these filters also reduce up to 96%* of virus-sized particles that can make you sick.
Is MERV 11 too restrictive?
A MERV 11 air filter has a higher efficiency rating. Meaning, it can capture finer particles and clear more contaminants out of the air. In most cases, a MERV 11 air filter isn’t too high for residential use.
Is MERV 11 better than 12?
We do not carry MERV 12; MERV 11 does just as good a job. MERV 12 filters trap 80 to 89 percent of average particles of 1.0 to 3.0 microns, with an average particle size efficiency of 90 percent or better. As you can see, they’re pretty close. That’s why you’re just as good going with a MERV 11 as with a MERV 12.
How often should you change a MERV 8 filter?
The basic recommendation for furnace filters replacement is every 3-4 months for MERV 8, every 6 months MERV 10 and 11 and every year for MERV 16. There are other several factors to consider when determining when to change your home air filter.
How long does a MERV 8 filter last?
Another factor driving the popularity of MERV 8 filters is that they are inexpensive and easily serviced. Depending on the manufacturer they can last three to six months and even up to a year in residential use.
What is the difference between Merv 7 and Merv 8?
A MERV 5 filter will trap up to 34%, MERV 6 will stop 35-49%, MERV 7 will prevent up to 69%, and MERV 8 will catch up to 85% of particles. These filters are slightly more restrictive than the MERV 1-4 filters and have the ability to catch mold spores and some pet dander along with dust and pollen.