The Space Gard 201 replacement filter fits the Space-Gard 2250 and 2200 unit. Space Gard products are now sold under the Aprilaire name. The product has not changed; only the name has changed. Filters are designed to improve the quality of indoor air. With pollution being much higher indoors than outdoors, it is important to remove as many of the contaminants as possible.

A good filtration system on a forced-air heating and cooling system is the best way to reach every room in the house. Room-size air purifiers are great and may be used in addition to the whole-house unit, particularly if someone has severe allergies or respiratory difficulties. The filtration on a whole-house unit is often a combination of filtering media to provide coverage for every type of pollutant.

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The smallest 0.01-micron particulate all the way to the largest particle must be captured and removed from the air to promote respiratory health. This includes pollen, mold, bacteria, viruses, dust, dust mites, aerosols, fumes, smoke, and other pollutants. A filter with a high MERV (Minimum Efficiency Reporting Value) rating will remove the widest range of particulate sizes.

Compare the efficiency rating of the various filters and you will find that it is worth the difference in filter cost to realize the improvement in the indoor environment. The heating and cooling unit will perform more efficiently when the coils and fan blower are kept clean. Less resistance on the motor accounts for lower utility bills. Always check the manufacturer's ratings and guidelines for compatibility before replacing any filter.