The NuTone PurePower 650 Air Watts Residential Central Vacuum System Power Unit combines powerful suction and unmatched filtration It comes with Sealed HEPA filtration combined with 650 air watts of power to give you the cleanest indoor air. It features a sleek design that can fit into compact spaces and works well for homes from 2,000 to 7,000 square feet. The PP6501 operates quietly and is virtually silent to you when vacuuming if it is installed in a basement or garage.