AC / Furnace Air Filters Guide

AC / Furnace Air Filters are basically the same, the important thing is knowing which type you need to filter out the particles in your environment, knowing when to replace them and what they do. In this FAQ we cover some of the common questions regarding air filters, please contact us if you have another inquiry not covered here, and one of our experts will get back to you quickly.

What is MERV?

MERV is the abbreviation for Minimum Efficiency Reporting Value, it is part of the ASHRAE 52.2 Test Standard that determines the ability of an air filter to remove particles of a specific size from an air stream. They range from 1 to 16; 16 being the most efficient at capturing particles.

How often should I replace the filter?

There are many factors that determine when a filter should be changed including how long the unit runs, air quality, humidity and other factors. Needs can vary greatly from application to application.

For most pleated filters, is it recommended to change them out every two to three months. Many of the filters offered by ISC Sales are reusable. For more information about our filters, please browse our products or contact an HVAC expert today.

How do I know which direction to install my filter in?

The airflow will be indicated by arrows printed on the filter. The filter should be installed with arrows facing the direction of airflow.

What is the difference between a furnace filter and an AC filter?

Furnace filters and AC filters are the same type of product and are interchangeable.

Are your filters electrostatically charged?

Yes, we carry electrostatically charged filters to attract dust, debris and bacteria more effectively. To learn more about electrostatically charged filters contact an HVAC expert at ISC Sales today.

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