Because of this, the filter you are replacing could be called a 20x25x4 and really be the same as our 20x25x5. This is why we ask you to measure Actual size of your filter to ensure it will fit.

Can I use a 1 inch filter instead of 2?

Yes/no. The two inch filters have twice the surface area as a one inch filter. This means that with a 1″ filter, airflow will be restricted much quicker as the filter gets covered in dust.

Does Merv 8 restrict airflow?

Because they restrict airflow to your HVAC system. Pleated, high-MERV filters definitely capture a lot of pollutants, but they also restrict the movement of air into your blower or furnace. When you need better filtration than what a 1″ MERV 8 filter can provide, the best solution is to invest in…

Furthermore, can I use a 1 inch filter instead of 5?

3M makes a magnetic adapter that allows you to use a 1 inch filter instead of 5 inch one.

Similarly, it is asked, can I use a 4 inch filter instead of 5?

No way! You just need the right kind of high MERV filter. A thicker filter (4-5 inches) has more surface area and therefore allows more room for air to pass through. Do this: If you’re really interested in keeping your air clean, we’d suggest you get an air cleaner/purifier installed in your air ducts.

How often should a 4 inch furnace filter be changed?

A four inch filter will need to be changed every two months and a five inch filter every three months. If you only have one animals then you can change that and change the filters every two, four and six months depending on the size of your filter. No animals means you can change every three, six and twelve months.

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Is a 4 inch furnace filter better than a 1 inch?

Well, 4-inch filters have larger pleats. That means they have more surface area to catch particles, making them last 3-5 times longer than 1-inch filters. Most HVAC technicians recommend changing 1-inch air filters every 30 days, while 4-inch filters can be changed every 3-6 months.

Is MERV 11 too restrictive?

A decade ago, it used to be that if you had an HVAC system that used panel filters rated 6 through 9 MERV, putting in a MERV 11 or higher filter would restrict airflow (known as filter pressure drop). In turn, this would lengthen the system’s run-time, adding to your heating and cooling costs.

How do I know my furnace filter size?

Furnace filters are sized by width, length and thickness. The size on the filter is usually expressed in inches (example: 16″x20″x1″). A filter that is the wrong size will typically not fit, or may not stay in place, once installed. The owner’s manual for your furnace should tell you what size you need.

What MERV rating is HEPA?


How often should I change my 5 inch furnace filter?

A good rule of thumb is to change 1-2 inch filters every three months, 4 inch filters every six months and 5 inch filters every 12 months. Signs your air filter needs changed: The filter is visibly dirty.

How long do 4 inch furnace filters last?

6 to 8 months

Can I use a thicker air filter?

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 HVAC system.

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 13-16 (best): These filters are usually only found in hospitals because they can capture particles as small as 1-0.03 microns in size.

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Does furnace filter size matter?

AC filter sizes will vary. Your air vent filter size should match exactly to slightly smaller than the measured outside length and width of the frame around that opening. Having an incorrect filter size is like not using a filter at all, which can have a bigger impact on your furnace and AC systems.

What if my air filter is too small?

Consequences of Using an Air Filter That is Too Small:

1. The filter can be sucked into the ventilation if it is much smaller than it should be. Dust, allergens and pollutants will not be filtered from your indoor air, as the air is bypassing the filter and entering into the ventilation and is returned back.

Is MERV 13 too restrictive?

MERV is a good way to help judge the effectiveness of an air filter. In some cases, using an air filter that is too restrictive for your system may cause low air flow problems as well. MERV 13 is the highest MERV value safe for residential furnaces; the higher ratings are used primarily in commercial units.

What HVAC filter should I use?

Electrostatic HVAC filters may be suitable if you want better filtration with ample airflow. Just remember to check the MERV rating since being labeled “electrostatic” doesn’t necessarily guarantee a more efficient filter. High-efficiency particulate arrestance (HEPA) filters are the most efficient available.

Subsequently, question is, can I use a 1 inch filter instead of 4?

While a 4-inch-thick filter is more efficient than a 1-inch filter, the right size depends on your furnace. If you measure the filter slot, and it’s large enough to accommodate the thicker filter, then you can use it. However, if the slot is less than 4 inches wide, you’re stuck with using that thickness.

Do thicker furnace filters last longer?

Filter thickness: A filter’s thickness can range from 1″ to 5″. As a general rule of thumb, a thicker furnace filter will last longer and can be more efficient.

What MERV rating do I need?

The MERV rating scale ranges from 1-16. Lower quality filters, in the 1-4 MERV range, are typically made of fiberglass. Most residential HVAC systems will use air filters with MERV ratings from 7-12. A higher MERV value of 5-16 would be recommended for commercial buildings.