This British Standard specifies requirements for portable and/or transportable negative pressure units (NPUs) incorporating HEPA filters covered by BS EN 1822 for use in the controlled removal of
asbestos-containing materials (ACMs).
This British Standard is also applicable to NPUs designed to create negative pressure within a portable decontamination unit facility or working enclosure and two-part NPUs.
This British Standard is not applicable to local exhaust ventilation.