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Ultra Low Resistance Allergen Filters for Cold Air Return Filter Grilles in Walls or Ceilings

by Barbara 22. August 2010 06:01

Question about theSafeHome Duo 20 inch by 20 inch by 1 inch 4 Pack and the Safe Home System Cold Air Return Purifier, 16X20X1

Q: "What is the difference between the two units as far as air flow and filtration is concerned? I manage a clinic where we have several very large cold air filter grills. Some physicians use aerosol products during medical treatments. We are also concerns about keeping the level of dust, spores, etc. to a minimum as the forced air HVAC system recirculates air. The filter grilles are hinged. Currently we are using 1 inch fiberglass disposable filters. Thank you for your input. Steve."

Answer: Both types of air filters will fit your 16 x 20 x 1 inch air return filter grille.

The Safe Home Duo, is a two layered polyester filter with a MERV8 rating. The first layer filters the particulates like dust, pollen, etc. The second, inner layer is impregnated with carbon and potassium permanganate that is for chemical removal.The Duo offers the same allergen, odor and chemical removal as the System, but in a single 1" filter. Duos utilize an inner steel frame that creates a filter with self sealing edges for great filtration and whisper quiet operation. SafeHome Duos are available as individual 3 month filters. You may need to replace more often depending upon your facility. To install, you fold the excess material around the filter's internal frame to slide it into the grille and then tuck the remainder in so you can close the cover over the filter slot. This excess material helps seal the edges where the filter fits into the equipment and keeps air from going around the filter through gaps. Air should enter the white side, which traps allergens, and exit through the dark side, which traps gases and odors.

The SafeHome System Annual filter package consists of four pre-filters for dust, pollen, spores, etc. and one pollution filter. The pollution filter absorbs gases and odors and fits into the air duct behind the return grille with filter slot. The System has 125 grams per square foot of activated carbon and FormadaSorb to remove the most common, hazardous pollutants. The replacement filters for the filter slot are electrostatic air purifier filters. These pre-filters should be changed at least every three months.

More frequent changes may be necessary due to a wide variety of circumstances that increase chemical, odors and particles like allergens or dust. Examples of chemical and particulate sources include the following:

  • Painting or renovations
  • High levels of outdoor pollution
  • Burning candles or using air deodorizers
  • Cleaning agents
  • Shedding Pets
  • High activity levels

Rated at MERV 7, these filters are pleated with thin metal wire in diamond shapes covering the pleats. MERV 7 is an industry standard rating that means the filter removes 50% to 70% of particles down to 3 microns in size. With use, removal increases to more than 98% effectiveness.

The manufacturer recommends that the Safe Home System be used in the largest air return grill for each air system. So, one choice is to use the Duo filters in all but the largest air return grill. When you calculate the difference in price, however, you may elect to keep all the grille filters the same especially if they are the same size in each exam or waiting room.

Both the SafeHome Duo and the SafeHome System come in many sizes.

Thank you for your question. Please contact us if you need more information.

Sincerely, Barbara