AS 2252.1:2002 pdf free download.Biological safety cabinets Part 1: Biological safety cabinets (Class I) for personnel and environment protection.
4 CONSTRUCTION REQUIREMENTS
4.1 Outer shell
The outer shell shall be of metal which, if not stainless steel, shall be coated with a durable, corrosion-resistant sealing material and shall be sufficiently robust to prevent fracture or distortion in transport and installation. It should be sufficiently gastight so that when subjected to the decontamination procedures described in AS/NZS 2647. the fumigant is contained within the cabinet.
NOTE: Reference should be made to Figure 1, which shows a typical Class I biological safety cabinet.
4.2 Work zone
4.2.1 General
Except for the viewing window (and side windows, if fitted) and prefilter assembly, the boundaries of the work zone shall be con strticted entirely of Series 300 stainless steel with 2B finish. The grade of stainless steel used in the construction of the work zone should be selected for resistance to chemicals used during work processes and in disinfection.
NOTE: Grades 304 and 3 16 have been found to be suitable for most applications.
In order to prevent penetration by microorganisms, facilitate disinfection and prevent injury, all joints and surfaces in the work shall be finished smooth and crevice-free. Sealants shall be non-porous with a smooth finish and resistant to chemicals and normal disinfecting processes.
4.2.2 Viewing ii’indow
The viewing window shall be a panel of safety glass extending the full width of the work zone, and forming a positive seal with the body of’ the cabinet.
The window should be vertically aligned with the front boundary of the FIEPA filter installation. Means shall be provided to secure the window in the working position during cabinet operation to make a positive seal to the inner boundary of the clean work zone.
An audible or prominently visible alarm, which is activated when the window is other than in the fully-open or closed position, shall be fitted. When the window is in the fully-open position, the alarm may be muted for a maximum of 15 minutes, at which time it is reactivated to its full audible capacity.
4.2.3 Work access opening
The width of’ the work access opening shall be that of the work zone.
4.2.4 Work access opening cover
A loose cover to fit the work access opening shall be provided for use when the cabinet is not operating and when the ultraviolet light, if fitted, is operating.AS 2252.1 pdf download.