In certain cases, depending upon the types and quantities of hazardous materials used, a fume hood fire suppression system may also be required. Sinks inside fume hoods must have a raised rim or other design feature which prevents accidental chemical releases to the sanitary sewer. Do not install sinks inside hoods unless they are specifically requested and needed. F ume hoods should be located in close proximity to where chemicals are stored, and away from exits or where interfering air currents and cross drafts from doorways, windows, high traffic areas, HVAC systems, or other apparatus, could adversely affect the proper function of the hood enclosure. Consideration of make-up air volume and location is critical for effective, safe operation of the hood.
Perchloric acid is an extremely dangerous, powerful oxidizer.
Use of an alternative material is encouraged wherever possible. If perchloric acid is to be used, a specialized, dedicated stainless steel hood, labeled for perchloric acid use only must be installed. A regular chemical fume hood may not be used for perchloric acid. Conventional chemical fume hoods are suitable for many low level radioisotope applications, however, the use of some materials such as radioactive iodine, requires a specialized radioisotope hood equipped with integral filter components. In these cases, service contracts must be set up for maintenance, calibration and filter replacement or disposal.