The BOA Midi model designed for medium-sized environments has a flow rate of 900 m3/h, a high efficiency EC motor and 3 filtration stages: Pre filter G4 Activated carbon filter : Active 96 Hepa filter H14 - 8m2 A valve allows you to adjust the flow rate from Eco to Fast according to your needs. Compact and silent, thanks to the wheels they can be positioned in any closed environment where more people stop, guaranteeing everyone the opportunity to breathe clean air. Regular maintenance of the pre-filter ensures a long service life of the upper stages. BOAs have 5 years warranty Available on request the version with ionizer