The Kontrol Kube Negative Air Machine is ideal for use as a negative pressure generator for containment systems like the Kontrol Kube or by itself as a portable air scrubber. Ideal for hospitals and other medical facilities, the Kontrol Kube Negative Air Machine features a 3 stage filtration system- pre-filter, DOP filter, and HEPA filter, while offering a revolutionary combination of power, efficacy and convenience. The Negative Air Machine delivers a variable speed up to 500 CFM with HEPA filter installed and comes equipped with a DOP Stage 2 First Pass Pre-filter ensuring one pass HEPA filtration for air clearance every time. The Second Stage DOP Compliance Filter allows the Kontrol Kube Negative Air Machine to pass laboratory DOP testing conducted per ANSI standards, achieving an efficiency rating of 99.97% against oily aerosol particles down to 0.3 microns. The Negative Air Machine also gives the user the ability to plug three units together in order to provide 1500 CFM. Proudly made in the USA, the Kontrol Kube Negative Air Machine is lightweight at just 44 lbs, durable and features a quiet operation. See the ACCESSORIES tab for additional filters sold separately.