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| Panel Filters |  The most widespread panel filters are the throwaway spun glass or glass fiber kind and the cleanable "pig’s hair" goods. Their thickness is generally 1 inch or less and they match the normal filter opening for housing forced-air systems.
Panel filters are reasonably priced to purchase – they price ranges from $5 to $50 -but they have dust-absorb effectiveness of less than 5%. Their filtering ability in fact rises as they get unclean, but this is accomplished at the cost of hindering air stream and augmenting pressure drop. To prevent hindering air stream, they should be replaced every one to three months. They perform a bad role in defending the forced-air system and don’t provide human lungs with any defense from particulates.
Electrostatic Panel Filters
Electrostatic panel filters are a bit more effectual than typical panel filters as they use static electricity to draw charged particulates in the air flow. Either the static electricity is produced by air as it goes through the filter, or the filter is created with precharged electrets produced from propylene, polypropylene, or other plastic stuff. The electrets are lastingly charged with both positive and negative charges. As air goes through the charged filter substance, oppositely charged particulates in the air flow adhere to the filter's threads.
Electrostatic filters are generally 1 to 2 inches thick and are characterized with low air stream resistance so that they could simply be replaced with a typical panel filter. On the other hand, they "face load," denoting that dust amasses mainly on the surface which is directed to air stream. Face loading could considerably augment the pressure drop and lessen effectiveness. The period between cleansing or before substitution can range from one month to the whole heating or cooling season.
Electrostatic air filters on average include a dust-absorb effectiveness of 10%-15%. They are hardly effectual at trapping small particulates (1 µ or less) but more efficient than a panel filter on bigger particulates (greater than 10 µ), such as fungus spores and pollen.
Electrostatic filter prices range extensively. Some goods are priced at under $10; others are sold at over $125. These filters generally operate longer than typical panel filters.
Electrostatic panel filters utilize static electricity to draw charged particles in the air stream onto the filter face. While not as efficient as electrostatic precipitators, they do not call for electrical energy, and are less cost. Nevertheless, they frequently "face-load" on the face pointing out the direction of the air stream, which may augment pressure drop and lessen filter effectiveness.
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