For most homes, a MERV rating between 8 and 13 strikes the perfect balance between filtration, airflow, and cost. A MERV 11 filter, for instance, can last up to six months and offers excellent air cleaning without putting too much strain on your HVAC system.
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.
In most cases, a MERV 11 air filter isn't too high for residential use. Generally speaking, anything under a MERV 13 air filter should provide very efficient air purification in a home without impacting airflow.
The MERV 11 air filter is the wrong choice for people who do not own pets and do not have any breathing trouble; this is because it can lead to restricted airflow. Air filters with higher ratings can also have negative effects on HVAC components.
HVAC professionals say MERV 8 is the highest you should go. Filters are there to protect the equipment not you. The higher the MERV rating the harder the furnace has to work. 1/2x a year change the filter unless you have pets then change 3/4x a year.
Air filters with higher efficiency ratings may do a better job clearing the air. Still, they'll also force your HVAC system to work harder, resulting in performance challenges and higher energy bills.
A 1” MERV 13 pleated filter has a pressure drop of around 0.27, and a 1” MERV 8 has a pressure drop of around 0.14.
Furnace filters with a MERV 8 rating or higher can effectively remove pet dander from the air. On average, MERV 8 filters remove 85% of large air particles and 50% of small particles. The higher you go the better the filtration will be, but we don't recommend going higher than MERV 13.
Similar to the previous MERV filters, it is often recommended to replace MERV 8 filters every 90 days. As a side note, make sure to replace you air filter with the right air filter size.
A MERV 9 will trap less than 50% of particles sized 1.0-3.0 microns, MERV 10 will stop up to 64%, MERV 11 will get up to 79%, and MERV 12 is capable of catching up to 89%.
Filters rated MERV 8 are an excellent choice for homes without air quality concerns like allergies or respiratory health complaints. A MERV 11 filter, in contrast, provides enhanced filtration by capturing a greater percentage of smaller particles, including vehicle emissions, bacteria, and mold spores.
Sometimes, a MERV 11 filter may be too restrictive, particularly for older or smaller HVAC systems not designed to handle the increased pressure drop. If you notice that airflow has diminished or your HVAC unit is cycling on and off more frequently, these could be signs that your filter is too restrictive.
Generally, this is how long a filter lasts based on MERV ratings: MERV 1-4 furnace filters should be replaced once a month. MERV 5-8 filters need to be changed roughly every 3 months. MERV 9-11 filters require replacement every 6 months.
However, it's worth noting that filters with higher MERV ratings can restrict airflow. While filters rated 13 or below generally don't strain most HVAC systems, those rated above 10 might require professional installation.
One disadvantage of the highest MERV rated filters is that: The pressure drop across high MERV filters is more.
These high-quality filters trap particles as small as one micron, including Legionella and humidifier dust. MERV 9 to 12 filters are the best filters that a residential HVAC system will accommodate without serious system modifications.
You may not need a MERV 11 filter or higher unless you have specific air quality issues or allergies. For the average household, a MERV 8 air filter can be good enough. You'll want to think about factors like how often you want to change your filters and what type of material do you want filtered out of your air.
A pleated filter is made up of different sizes, and readily captures pathogens as small as 0.3 microns, filtering out even the tiniest of bacteria. They are overall more effective in capturing very tiny particles than non-pleated air filters; 99.97% of airborne particles are trapped with a pleated air filter.
The primary drawback of high MERV filters is that the pressure drop across them is too high, which can lead to reduced airflow and increased energy consumption in HVAC systems. This resistance may strain mechanical components over time, potentially causing failure.
MERV 8 filters are sufficient for most homes. These filters are capable of trapping particles that exist in the average home, such as dust, pollen, and hairspray. MERV 8 filters allow good airflow and are not taxing on residential HVAC systems.
Well, MERV ratings range from 1 to 20, with 1 being the lowest level of filtration, and 20 being the highest. Filters that are MERV 16 through 20 are usually only found in hospitals, cleanrooms, and nuclear power plants. The home air filters you're looking for have a MERV rating anywhere between MERV 5 and 13.
Because not all HVAC systems can use HEPA filters, air filters with a MERV rating of 13 to 16 are the best option to trap pollen, pet dander, mold spores, and dust mites, and they're highly effective for reducing allergens and improving indoor air quality.
This extra depth gives the filter more room for airflow. That means that as the filter collects dirt and other debris from your air, it won't restrict the airflow in your furnace as much. This prevents damage to the furnace and gives the filter itself a longer lifespan.
What's The Correct Filter Pressure Gauge Read? Most filter systems are designed to operate in the 5-15 psi or 10-20 psi range. The way to find out your particular correct pool filter pressure is to clean or backwash the filter thoroughly and empty the pump and skimmer baskets.
The three major types of MERV 8 filters on the market today are pleated filters, ring panels and tackified polyester pads. In the ASHRAE 52.2 test, average efficiency is calculated on the basis of three particle size ranges – E1= 0.3 to 1 micrometer, E2= 1-3 micrometers and E3= 3-10 micrometers.