What are 30% filters?

For instance, a 30% filter (based on arrestance) means that 30% of the weight of the dust has been captured. Depending on the size of the dust particles the actual number of particles (and hence the percentage of particles) captured may be substantially less.

What are the grades of filters?

The standard specified three filter groups: G (coarse), M (medium) and F (fine). Coarse filters were classified according to the average arrestance of synthetic dust used in the test. They ranged from G1 (50-65% arrestance) to G4 (90% arrestance).

What is the ideal rating for an air filter?

Best Air Filter for Your Home

In general, the best MERV rating for a home is somewhere between 8-10. These filters will capture a large portion of the airborne particles and improve indoor air quality without making your energy costs rise significantly.

How do filter sizes work?

All filters have an actual size and then a nominal size. The actual size is the exact dimensions with no rounding; whereas, the nominal size is the rounded dimensions of the filter. This means that on 1" and 2" air filters, the nominal size does not include the undercut, and the actual size does include the undercut.

How do you measure filter size?

Step 1 - Measuring Length and Width (L x W). (If your filter is not a square, the smallest measurement goes first). Step 2 - Measure the thickness (Depth) of your filter from front to back. Step 3 - Put Your measurements together (L x W x D).

What is 30/30 Dual 9 Air Filter

Are thicker air filters better?

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.

Which MERV rating is best?

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.

Is a higher or lower MERV rating better?

While the highest MERV ratings are the most effective for air quality, they can harm your HVAC system. A higher MERV rating means a higher resistance, which means less airflow. When researching HVAC systems, airflow will come up a lot.

What do air filter numbers mean?

Filter efficiency and performance is often indicated by the filters' minimum efficiency reporting value, or MERV rating. Standard MERV values range from 1 to 16, with the number serving as an indicator of how well the filter will remove material from the air. Higher MERV numbers indicate better filtration.

What are G3 and G4 filters?

What is MERV rating for Covid?

What kind of filter should I use in my home HVAC system to help protect my family from COVID-19? Minimum Efficiency Reporting Values, or MERV, reports a filter's ability to capture particles. Filters with MERV-13 or higher ratings can trap smaller particles, including viruses.

Will MERV 13 hurt my furnace?

What Are MERV 13 Air Filters? MERV 13 air filters are the highest-rated air filters for home use. Any air filter with a rating higher than 13 will restrict air flow to the point of which could cause damage to your HVAC system, resulting in an added expense to fix it.

What percentage is MERV 13?

As specified by NAFA, to be labeled as MERV 13, a filter must successfully remove at least 90% of E3 particles, 85% of E2 particles, and 50% of E1 particles.

Will MERV 11 hurt my AC?

In particular, using an air filter with a MERV rating that's too high can damage the compressor, heat exchanger, and air conditioner coil. In most cases, a MERV 11 air filter isn't too high for residential use.

What MERV filter does carrier recommend?

Selecting a good quality filter with 12 – 16 MERV to remove a high percentage of offending particulates. Be sure to check your filter at a minimum of once per month.

What MERV is HEPA?

A HEPA is the creme de la creme of air filters with an equivalent rating of a MERV 17 or higher. A HEPA filter at a MERV 17 rating will trap 99.97% of air particles that are 0.3 microns in size, but capture an even higher percentage of particles smaller or larger than that size.

Is MERV 11 or 13 better?

MERV 11 furnace filters have a particle arrestance of a little over 90%. In comparison, MERV 13 HVAC filters have a particle arrestance of around 98%. Naturally, it is significantly more efficient. MERV 11 rated air filters are ideal for those who live in a moderately polluted area, have mild allergies, or own a pet.

Are pleated filters bad for AC?

Pleated filters are bad for your system because they block too much air, forcing the HVAC motor to work harder to pull in the air it needs and burning it out faster.

Do more expensive air filters work better?

Yes, in general, the more expensive air filters are more effective, but a single person with no pets and allergies might not need as much filtration as a family of five with three pets and a child with asthma.

What happens if you use the wrong size air filter?

The biggest concern when you use the wrong size air filter is that it may not effectively prevent dust from building up on your HVAC system's motors and blowers. This dirties up your furnace which could affect its performance or possibly harm the system's internal components, leading to costly repairs or replacements.

How do you calculate air filter area?