How to Choose Your Electrostatic Air Filter

Choosing the Right Air Filter

The Different Types of Permanent Filters

FeaturesGold Frame 94Silver Frame 88Flex Frame 94Flexible Frame 88ESS Frame
Filtration Efficiency94%88%94%88%94%
Dust Holding Capacity165 grams126 grams165 grams126grams165 grams
Air Flow Resistance0.
Frame QualityExcellentGoodFlexibleFlexibleGood
UV ResistantYesNoYesYesYes
MERV Rating86866

Some Common Air Filter Questions

What is the difference between a 94% arrestance filter and an 88% arrestance filter?
The main difference is airflow. Our 88% filters were developed to allow for extra airflow so you can use them in systems that have a reduced sized return opening. You’ll often find these in older homes where central air was installed after the house was constructed. Because of the additional airflow, the filtering efficiency is reduced by about 12%, but remember, at 88% filtering efficiency, it’s still about 8 times better than the typical disposable filter.

What’s the difference between the Gold Frame and Silver Frame filters?
Our Gold Frames are made with premium quality extruded aluminum, gold anodized frame with a durable and attractive finish. The Silver Frames are silver in color and made with 1 piece of metal instead of 4 pieces of metal like our Gold Frame filters. Basically, the Gold Frames are higher quality and more durable.

What’s the difference between a standard size filter and custom size filter?
Every filter we sell is either a standard size or a custom size. The length and width for a standard size air filter is undercut by 3/8″ to accomodate standard size openings. This is consistent with other filter manufacturers. For example, if you are replacing a 25″ x 25″ disposable filter, then you need a standard size 25″ x 25″ electrostatic air filter. The actual size of this filter is actually 24 5/8″ x 24 5/8″.

A custom size filter however is cut to the exact sizes you specify. So a custom size 25″ x 25″ filter will be exactly 25″ x 25″ – there is no undercut. The difference is very important – so if you have questions, please contact us.

Why would I need a flexible frame filter (Flex 94 or Flex 88)?
The only reason you would need a flexible frame electrostatic filter is if you need to bend the filter in order to install it. If you can easily slide your filter in and out of place, then go with a standard metal-framed filter.