Question: How do I know what size furnace filter I need?

How do you determine furnace filter size?

Follow these 3 easy steps:

  1. Follow these 3 easy steps:
  2. Step 1 – Measuring Length and Width (L x W). …
  3. Step 2 – Measure the thickness of your filter from front to back.
  4. Step 3 – Put Your Measurements Together (L x W x D).
  5. It’s as simple as that – You are now ready to buy the right filter for your AC or Furnace.

How do I know what size air filter I need?

Follow these 3 easy steps to measure your HVAC filter size:

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

How do I know what furnace air filter I need?

First, locate the filter slot in your furnace/air handler. Some homes have filters behind their return vents as well. Furnace filter size is measured using length, width, and depth. For example, a furnace filter that measures 18”x16”x1” is 18 inches long, 16 inches wide, and 1-inch deep.

IMPORTANT:  Can a dirty air filter make a car run rich?

What happens if you use the wrong size air filter?

When you use the wrong size air filter, or you install it incorrectly, the filter can’t effectively prevent dust from accumulating on the system’s motors and blowers. You’ll end up with a dirty furnace that can’t properly perform, and all of that debris could end up harming the system’s internal components.

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

4-Inch vs 1-Inch Furnace Filters

The 4-inch thick air filter has a definite advantage over the 1” filter in terms of longevity, airflow and maximum filtering potential. Thus, if it fits your furnace, then a 4-inch air filter is better than a 1-inch air filter in regards to improving air quality.

Do air filters have to be exact size?

Since air filters are most often sold by their nominal dimensions, it is crucial to learn how to properly measure your air filter. When making your purchase, you should order your filter by its nominal size, rather than its actual size.

What is a standard air filter size?

Standard air filter sizes include:

10X20 14 X 20 20X20
12X12 14X24 24 X 24
12X20 14X25 20X24
12X24 14X30 20X25
12X30 15X20 20X30

What is the most common size air filter?

What Are the Most Common Air Filter Sizes

  • 20 x 25 x 1.
  • 20 x 25 x 4.
  • 16 x 20 x 1.
  • 16 x 25 x 4.
  • 20 x 30 x 1.
  • 12 x 12 x 1.
  • 14 x 14 x 1.
  • 14 x 20 x 1.

Are all air filters the same size?

Air Filter Sizes for Your Home Can Be Frustrating

Unfortunately, that’s not the case – there are about 20 “standard sizes” for air filters, and none have the same measurements. … Even worse, incorrectly sized air filters can place undue stress on your HVAC system, damaging it and increasing your energy bills.

IMPORTANT:  Quick Answer: Do you have to drain oil before removing oil filter?

Are high MERV filters bad for furnace?

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. … If the MERV rating on your furnace is too high, it may force your furnace to work too hard and leave it vulnerable to damages.

Can my furnace handle a MERV 13 filter?

The ideal MERV filters for both air filtering and furnace efficiency are 7-13, experts say. These filters can be used without any modifications to your equipment. Your system may handle MERV 14-16 with no discernable stress. However, many residential systems require modifications to pull air through these filters.

Is it OK to cut a furnace filter to fit?

Answering the Question: Is it okay to cut an air filter to fit? … Simply put, yes, you can cut an air filter if you know what you are doing, and if the filters you use will not become too weak from the cutting.

What happens if I put my furnace filter in backwards?

When a furnace filter is placed backwards, the fibers can’t do their job properly. This means your furnace has to work harder to generate the same air flow, resulting in increased energy costs. Particles are also allowed to build up irregularly, making the furnace working even harder to draw air.

How tight should a furnace filter fit?

How tight should a Furnace Filter fit? When you remove the existing filter, take note of the dimensions printed on its frame. Your new filter will need to match this size for the system to run efficiently. It should fit snugly but not so tight that you can’t easily slide the filter in and out.

IMPORTANT:  Do you really need an oil filter wrench?