How Thick Should My Air Filter Be?

Do HEPA filters restrict airflow?

High-efficiency particulate arrestance (HEPA) filters: These are the true high end of filtration and are able to filter out 0.3 micron particles.

HEPA filters drastically restrict airflow and should only be matched to a compatible system..

Are 4 inch furnace filters worth it?

At four inches thick, it offers greater surface area to capture more particles and germs from airflow. It works better and it lasts longer than other cheaper disposable air filters. As a result, homeowners do not need to change 20x25x4 air filters as often.

Is a 2 inch filter better than a 1 inch?

When it comes to a 1 inch vs 2 inch furnace filter you could use a 2 inch filter if your vent is deep enough and a 2 inch filter will generally last longer since it has more media.

Where should I place my air filter?

The air filter is typically located at the point where the return duct enters the air handler. Larger houses often have more than one HVAC system. Each system will typically have at least one air filter. Therefore, your home may have air filters located at the air handler AND in the returns.

How do you calculate CFM for air filter?

CFM can be determined.4 x 500 = 2000. 4 sq. ft. x 500 FPM = 2000 CFM. Calculating Velocity (FPM) When face area and air quantity are known. … 2000 / 4 = 500. 2000 CFM / 4 sq. ft. = 500 FPM. Calculating Face Area (sq. … 2000 / 500 = 4. 2000 CFM / 500 FPM = 4 sq. ft. Application Example. An engineer wants to know how many filters.

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.

What happens if air filter is too small?

Consequences of Using an Air Filter That is Too Small: The filter can be sucked into the ventilation if it is much smaller than it should be. 2. 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. 2.

How often should you change a 4 inch air 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. Certainly if you can’t see the material of the filter itself, it should be replaced.

Does air filter depth matter?

If improving air quality is a priority for you, depth of the filter doesn’t matter so much as MERV. … The higher the MERV rating, the smaller the contaminants a filter can trap—which also means it will clog faster.

How do I know what size air filter I need?

Take out your measuring tape and get the exact dimensions yourself. These are written as length x width x depth (for example: 18x20x1). Lay the filter flat on the ground and start by measuring top-to-bottom for length, left-to-right for width, and front-to-back for depth. You should have 3 numbers written in inches.

Are 4 inch or 1 inch furnace filters better?

Question: Are 4 inch or 1 inch furnace filters better? Answer: In terms of durability and filtration efficiency, 4 inches filters are way better than 1 inch thin ones.

What happens if you put 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.

Can I use a 1 inch filter instead of 4 inch?

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.

What is the most common air filter size?

Standard air filter sizes include:12 X 2414 X 2014 X 3016 X 2516 X 2018 X 3020 X 2020 X 2524 X 244 more rows•Nov 27, 2017

What if air filter is too big?

If you have a filter that is too big for your system, it may seem like an easy enough fix– just fold it over or trim it down, right? … The debris will quickly build up in your AC system, as well as being blown into your home. Heating and cooling systems should always be operated with the proper filter installed.

Does thickness of furnace filter matter?

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. Your system configuration will determine the thickness of the filter that you can use.

What is the best air filter for home?

So here is my list of The 10 Best Furnace Filters.AIRx Health 1″ MERV 13 Furnace Filters. … Honeywell FC100A1037 Ultra Efficiency 4″ Furnace Filters. … Nordic Pure 4″ Furnace Filters. … FilterBuy 1″ Furnace Filters. … AIRx ALLERGY 1″ Furnace Filters. … Filtrete Micro Allergen 4″ Furnace Filters. … X6673 Lennox 4″ Furnace Filters.More items…•

Can I 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.

How long do air filters last?

60 daysFor basic 1″–3″ air filters, manufacturers typically tell you to replace them every 30–60 days. If you suffer from light to moderate allergies, you could install a better air filter or replace them even more regularly.

Is a larger air filter better?

Smaller filters will clog faster than larger ones, given the same carb cfm. As filters load up, the pressure differential across them increases, which decreases the engine’s ability to draw air through them. The bigger the filter element, the better.

What type of air filter is best for HVAC?

Most media filters are what we call “low pressure drop” filters, which means they have a minimal impact on your system’s static pressure. This is a good thing. It’s why media filters are such a great option for indoor air quality and overall HVAC efficiency!