Do Pleated Air Filters Restrict Airflow and Why You Need to Know

Pleated air filters can indeed restrict airflow, but why does this happen? The main culprit is the pleats themselves, which can reduce airflow by up to 20%.

As we'll explore further, the shape and structure of pleated filters can create turbulence in the airflow, forcing the air to take a longer path through the filter.

This increased resistance can lead to decreased airflow, which may not be noticeable at first, but can add up over time, especially in larger spaces or during peak usage periods.

The consequences of restricted airflow can be significant, from decreased system efficiency to increased energy bills and even reduced indoor air quality.

A unique perspective: Pleated vs Fiberglass Air Filters

Pleated air filters are designed to capture smaller particles than fiberglass filters, with a MERV rating of 8 or higher able to capture particles as small as 1-3 microns.

Pleated filters can be more effective at capturing particles than fiberglass filters, but their increased surface area can also lead to increased air resistance.

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A pleated filter's pleats can be up to 5 times deeper than a fiberglass filter, allowing for a larger surface area to capture particles.

Pleated filters are often more expensive than fiberglass filters, but their increased effectiveness can make them a worthwhile investment for people with allergies or respiratory issues.

The pleats in a pleated filter can also be prone to clogging, which can reduce airflow and require more frequent replacements.

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Pleated air filters have a mesh weave that traps and absorbs passing particles without restricting airflow.

The effectiveness of pleated air filters can be seen through their Minimum Efficiency Reporting Value (MERV) rating, which determines the tightness of the mesh weave.

A MERV rating of 8 is a good starting point, as it increases efficiency by nearly 15% for a negligible price increase.

Higher MERV ratings, such as 13, are necessary for single-stage systems that help obtain or maintain LEED green certification.

A MERV rating of 13 or higher can restrict airflow if the weave is too tight, resulting in costly airflow restriction.

The MERV rating scale goes from 1 to 16, with standard commercial pleated filters typically starting at MERV 7 and going up to MERV 13.

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Air filter construction plays a significant role in determining airflow performance. Wire-backed pleats provide extra support for filter media in high-temperature and high-moisture applications, preventing filter collapse and air bypass.

Self-supported pleats, on the other hand, are a cost-effective alternative that offers similar filtration performance without using metal. They're suitable for applications with moderate conditions.

Heavy-duty pleats, like the Airguard DPHD, are designed for demanding applications with high air velocities and durability concerns. They feature thicker galvanized wire and beverage board for extended filter life.

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Pleated air filters can be made of various materials, including paper, cotton, polyester, and other pliable materials.

The filter media in some pleated filters is made of polypropylene/acrylic fibers, a high-quality, synthetic material that traps particles as small as lint, dust mites, and mold spores.

There are two main types of pleated filter construction: wire-backed and self-supported.

Wire-backed pleats provide an extra layer of support for the filter media, which is helpful in applications with high temperatures and moisture.

Self-supported pleats offer an alternative way to provide stability for the filter media without using metal, making them a more cost-effective solution.

They are typically the construction of choice for applications where moisture, temperature, and higher air velocities are not concerns.

Heavy-duty pleats are available for more demanding applications where durability is a primary concern, and in situations where customers are seeking extended filter life with fewer change-outs.

These filters include thicker galvanized wire and beverage board, such as the Airguard DPHD, a MERV 9 filter.

Dimensions play a crucial role in selecting the right pleated filter. Knowing the size of your filter frame is key to getting it right.

There are three common depths of pleated filters: 1”, 2”, and 4”. These sizes depend on the frame and unit the filter is going into.

A standard size filter is actually referring to the size of the frame it's going into, not the filter itself. This is often what's ordered, but it's essential to double-check to avoid any issues.

If you order the wrong size filter, you'll likely face one of two problems: it's either too large to fit or too small to securely fit, leading to air bypass and reduced air quality.

Here's a quick reference guide to the common sizes:

Fiberglass filters clog easily with larger particles, making them require more maintenance than pleated filters.

They need to be replaced every 30 days, which can add up to a lot of maintenance over time.

This frequent replacement can also put extra stress on the HVAC system.

Pleated filters, on the other hand, capture more tiny particles and last between 50 to 90 days.

Fiberglass filters allow for more airflow than pleated filters because they have less surface area and let smaller particles through. However, if not changed regularly, they can get clogged and harm your system.

Fiberglass filters are more prone to clogging than pleated filters, which can cause malfunctions and reduce HVAC system longevity.

Fiberglass filters let air flow freely due to their open, less dense design, reducing airflow resistance.

This design comes at the expense of stronger filtering capabilities, as fiberglass filters aren't quite as good at trapping tiny particles.

Pleated filters, on the other hand, offer higher airflow resistance and can trap additional pollutants in your home or business.

Their ability to trap more pollutants means pleated filters are a good choice for people with allergies or respiratory issues.

In contrast, fiberglass filters are a better option for those who prioritize airflow over filtration strength.

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Fiberglass filters are inexpensive, making them a budget-friendly option for HVAC systems.

They're often the default choice for many homeowners, but it's essential to consider their limitations.

Fiberglass filters offer minimal air filtration, capturing only large particles like dust and hair.

Pleated filters, on the other hand, offer better air quality and filtration, making them a superior choice for indoor air quality.

Fiberglass filters typically need to be replaced more frequently, every 1-3 months, whereas pleated filters can last up to 6-12 months.

Their low cost is a significant advantage, but it's essential to weigh it against the potential drawbacks.

Fiberglass filters are a cost-effective choice, usually priced between $1 and $5 per filter.

Pleated filters, on the other hand, can range from $5 to $15 per filter, depending on their brand and MERV rating.

Fiberglass filters need to be replaced every 30 days due to their lower lifespan and risk of clogging with larger debris.

In contrast, pleated filters typically last between 60 and 90 days, thanks to their larger surface area and improved filtration.

Here's a quick comparison of the two:

Fiberglass filters can occasionally let material collect inside the HVAC system, causing clogs and increasing the need for maintenance.

Pleated filters, on the other hand, prevent pollutants from accumulating on the HVAC system's coils and blower motor, reducing the likelihood of a malfunction and increasing the longevity of your HVAC system.

Fiberglass filters have less surface area than pleated filters, allowing for more airflow when changed regularly.

However, if you don't change them every 30 days, they can get clogged and potentially harm your system.

It's worth noting that pleated filters can be more reliable for your HVAC system performance over time, but it's essential to change them regularly to maintain their effectiveness.

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Pleated air filters can have a lower initial resistance, which means they consume less energy to flow air through the filter media.

The term "initial resistance" refers to the amount of pressure it takes to flow air through the filter media, and lower initial resistance is generally better for energy consumption.

Static pressure is the resistance to airflow in your HVAC system created by its components, and lower static pressure is generally better.

High static pressure results in lower airflow, which forces your HVAC system to work longer, potentially leading to higher power bills and a shortened lifespan.

The change in static pressure as air moves through your air filters is called pressure drop, and it's a measure of how much your air filter restricts airflow.

A pressure drop of 0.1 inches of water is typical for fiberglass filters, while a MERV 8 pleated air filter has a pressure drop of around 0.12 inches of water, which is almost the same as fiberglass.

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A MERV 13 pleated air filter has a pressure drop of around 0.25 inches of water, but this is still relatively low and doesn't necessarily result in a reduced lifespan of your HVAC unit.

The pleats in pleated air filters increase the surface area, allowing for greater airflow without increasing the filter size, and this design also increases filtering efficiency.

By changing your air filter on time, you can avoid increased power bills and excessive wear on your HVAC system's components, and according to the Department of Energy, changing your filter on time can save you 5-15% on your heating and cooling bills.

To determine which air filter is best for your home, consider the price and how it compares to other options like fiberglass filters.

Fiberglass filters can be cheaper upfront, but their quality and performance may vary.

When evaluating material quality, you'll find that filters are made of fiberglass, polyester, or paper.

The MERV rating is a crucial factor in determining the effectiveness of an air filter.

Here's a breakdown of the MERV rating system:

Pleated filters, on the other hand, can be more reliable for your HVAC system performance over time.

They prevent pollutants from accumulating on the HVAC system's coils and blower motor, reducing the likelihood of a malfunction.

However, if you don't change them every 30 days, they can get clogged and potentially harm your system.

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