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The PA300 is suitable for houses from 75 – 150 meters squared and can be attic-mounted or wall-mounted in a utility area. It has been designed for the mid-size dwelling, commonly found on multi house estates at the edges of towns throughout the country, but also has application for the large house, in combination with its larger brother the PA600

The PA600 was the original HRV unit designed and developed by ProAir Systems and was created with the larger house in mind. The experience of the time was that self-build dwellings were generally between 150 m2 and 300 m2 in size.