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HEPA Filter Buyers' Guide

As filters reach the end of their lifespan, the element fills up with tiny dust and particles, causing the flow rate to significantly decrease. Replacing the filter element will instantly restore the functionality and efficiency of your unit. To make the replacement process quick and easy, you need to know the correct product to buy for ideal operation of your heating or cooling system. Use the following information to find the right HEPA filter for your HVAC unit.

  • Airflow Rate – Unlike electrostatic, pleated and activated carbon filters, HEPA filters have a relatively low airflow rate. The standard filters run from 465 to 1000 cfm, while high capacity filters offer increased airflow ranging from 900 to 2000 cfm. You will need to compare the suggested airflow rate for your unit with the HEPA filter options available today. This information should be easy to find in your HVAC unit manual or through your HVAC technician. Installing a filter with the incorrect airflow rating could damage the unit, so it is important to compare the cfm numbers before making a purchase.
  • Dimensions – The HEPA filter needs to sit snugly in the unit to process all of the air flowing through the system. Otherwise, dust, pollen and other allergens could enter the work space through the vents. Luckily, for most units, there are two main HEPA filter sizes to choose from and they are easy to differentiate. Measure your HEPA filter using a tape measure and purchase the appropriate size, which will be either the 24x12 or the 24x24 models. If your unit has different dimensions than these two options, you can contact your HEPA filter supplier for one of the off sizes, or go to our website www.factorydirectfilters.com.
  • Efficiency Rating – The relatively low airflow rate of HEPA filters relates directly back to their tiny element openings designed to trap the majority of dust particles and allergens. The efficiency ratings you can choose between for your HEPA filter include 95%, 99.97% and 99.99% in removing .3 micro sized particles. Higher efficiency HEPA filters will noticeably decrease in airflow as it nears the end of its two-year life span. If your unit is sensitive to slow airflow ratings, you may want to select the 95% efficiency filter. On the other hand, if your allergies require the best filter rates, you can just change your 99.97% or 99.99% filters a few months early.
  • Changing Your HEPA Filter – Since the HEPA element fills with particles, you will need to change the filter at least once every two years to keep the system fresh. You can change your filter yourself by unplugging the system, removing the filter cover and switching the old element for the new one. After replacing the cover and plugging in the system, you can test out your unit to check for normal operation. Your HVAC unit’s owner manual should have the filter replacement process listed step by step. If you are not comfortable replacing the filter yourself, you can have a technician install your new filter.
  • The newly installed HEPA filter will keep your heating or cooling system operating at its peak efficiency year round. Whenever you need to seek a replacement HEPA element, you can follow this buyer's guide to find the perfect filter fit and function for your unit.

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24" X 24" X 11.5" STANDARD AND HIGH CAPACITY

HEPA Filter

The Aerostar 24" x 24" x 11.5" Commercial HEPA Air Filter is available in Standard and High Capacity. They are constructed with a rugged 18 Gauge Galvanized Steel Frame, wet laid microglass media, corrugated aluminum separators with hemmed edges on both sides, polyurethane sealant, and 1/4" x 3/4" wide urethane - ball-and-socket joint - downstream gaskets. Our HEPA filters are UL Classified to meet strict fire codes. Both 99.97% and 99.9% DOP's are tested on our CIPAT (Computer Integrated Particulate Air Test) duct to assure compliance with overall efficiency specifications, and have a Maxmium Temperature of 212 degrees F (100 degrees C). The 99.99% HEPA's are scan tested for leaks.

Standard Capacity 24" x 24" x 11.5" has a Rated Air Flow of 1000 cfm with an Initial Resistance (1.0" w.g.) and Final Recommended Resistance (2.0" w.g.), and comes in either the 99.97% or 99.99% DOP efficiency.

High Capacity 24" x 24" x 11.5" has a Rated Air Flow of 2000 cfm, with an Initial Resistance (1.45" w.g.) and Final Recommended Resistance (2.0" w.g.), and comes in either the 99.97% or 99.99% DOP efficiency.

24" X 12" X 11.5" STANDARD AND HIGH CAPACITY

HEPA Filter

The Aerostar 24" x 12" x 11.5" Commercial HEPA Air Filter is available in Standard and High Capacity. They are constructed with a rugged 18 Gauge Galvanized Steel Frame, wet laid microglass media, corrugated aluminum separators with hemmed edges on both sides, polyurethane sealant, and 1/4" x 3/4" wide urethane - ball-and-socket joint - downstream gaskets. Our HEPA filters are UL Classified to meet strict fire codes. Both 99.97% and 99.9% DOP's are tested on our CIPAT (Computer Integrated Particulate Air Test) duct to assure compliance with overall efficiency specifications, and have a Maxmium Temperature of 212 degrees F (100 degrees C). The 99.99% HEPA's are scan tested for leaks.

Standard Capacity 24" x 12" x 11.5" has a Rated Air Flow of 465 cfm with an Initial Resistance (1.0" w.g.) and Final Recommended Resistance (2.0" w.g.), and comes in either the 99.97% or 99.99% DOP efficiency.

High Capacity 24" x 12" x 11.5" has a Rated Air Flow of 935 cfm, with an Initial Resistance (1.45" w.g.) and Final Recommended Resistance (2.0" w.g.), and comes in either the 99.97% or 99.99% DOP efficiency.

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