The 550H/1050H models provide Dual-Stage HEPA filtration. Dual-Stage filtration models, like all Pulse-Bac vacuums, feature the 5 Point HEPA Filter as an initial stage of filtration and an additional exhaust side HEPA filter. Both the 5 Point Filter and the exhaust side filter are individually tested to meet the 99.97% @ 0.3 microns standard required by most regulations and recommended when working with many materials. In fact, third-party testing of the 550H showed that our 2 stage filtration system actually provided 99.99% @ 0.3µm filtration, exceeding the standard.
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