Gas Cabinets

These are suitable for gases (inert, flammable, oxidizing, reactive, pyrophoric, toxic, highly toxic, or corrosive). They are not designed for cryogenic fluids. 

Construction. Gas cabinets shall be constructed with the following: 

Ventilation. Gas cabinets shall be provided with an exhaust ventilation system. The ventilation system for gas cabinets shall be designed to operate at a negative pressure in relation to the surrounding area. Ventilation system shall be installed in accordance with the California Mechanical Code. Ventilation systems used for highly toxic and toxic gases shall also comply with the following: 

1. The average ventilation velocity at the face of gas cabinet access ports or windows shall be not less than 200 feet per minute (1.02 m/s) with not less than 150 feet per minute (0.76 m/s) at any point of the access port of window.
2. Gas cabinets shall be connected to an exhaust system. 
3. Gas cabinets shall not be used as the sole means of exhaust for any room or area. 

Maximum number of cylinders per gas cabinet. The number of cylinders contained in a single gas cabinet shall not exceed three. (Note: for toxic and highly toxic gases, there is an exception for cabinets containing cylinders not exceeding one pound (0.454 kg) where net contents are allowed to contain up to 100 cylinders).