The Control of Substances Hazardous to Health Regulations 1994

PART II CONTAINMENT MEASURES FOR HEALTH AND VETERINARY CARE FACILITIES, LABORATORIES AND ANIMAL ROOMS

Containment measures	Containment levels
	2	3	4
Note: “Class III cabinet” means a safety cabinet defined as such in BritishStandard 5726: Part I: 1992, or unit offering an equivalent level of operator protection as defined in British Standard 5726: Part I: 1992.
1.  The workplace is to be separated from any other activities in the same building.	No	Yes	Yes
2.  Input air and extract air to the workplace are to be filtered using HEPA or equivalent.	No	Yes, on extract air	Yes, on input and double on extract air
3.  Access is to be restricted to authorised persons only.	Yes	Yes	Yes, via air-lock key procedure
4.  The workplace is to be sealable to permit disinfection.	No	Yes	Yes
5.  Specified disinfection procedures.	Yes	Yes	Yes
6.  The workplace is to be maintained at an air pressure negative to atmosphere.	No, unless mechanically ventilated	Yes	Yes
7.  Efficient vector control e.g. rodents and insects.	Yes, for animal containment	Yes, for animal containment	Yes
8.  Surfaces impervious to water and easy to clean.	Yes, for bench	Yes, for bench and floor (and walls for animal containment)	Yes, for bench, floor, walls and ceiling
9.  Surfaces resistant to acids, alkalis, solvents, disinfectants.	Yes, for bench	Yes, for bench and floor (and walls for animal containment)	Yes, for bench, floor, walls and ceiling
10.  Safe storage of biological agents.	Yes	Yes	Yes, secure storage
11.  An observation window, or alternative, is to be present, so that occupants can be seen.	No	Yes	Yes
12.  A laboratory is to contain its own equipment.	No	Yes, so far as is reasonably practicable	Yes
13.  Infected material, including any animal, is to be handled in a safety cabinet or isolator or other suitable containment.	Yes, where aerosol produced	Yes, where aerosol produced	Yes (Class III cabinet)
14.  Incinerator for disposal of animal carcases.	Accessible	Accessible	Yes, on site