PERMAFILT Pre-Filter is designed to last for years. Once installed, this Pre-Filter can be easily maintained by occasional vacuuming from outside the perforated steel housing of the Austin Air unit. The HealthMate Pre-Filter: Standards is a replacement pre-filter for all Standard Austin Air models. The HealthMate Pre-Filter: Standards works to trap large dust particles, and can filters a room between 150-1500 square feet.
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