Chapter 5: Using the Protector Filtered Hood
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Starting the Filtered Hood
1. To start the filtered hood, insert an access card and press the “Fan” button.
You can also validate performance by listening to the fans, reviewing the
display, and/or watching smoke drawn into the hood face opening.
2. To turn the fluorescent light on with an access card already inserted, press
the “Light” button.
Operating the Vertical-Rising Sash
Because of the Protector Filtered Hood counterbalanced sash mechanism, it will
take only a few pounds of force to move the sash up or down, and you can operate
the sash smoothly with one or two hands positioned anywhere along the handle.
The vertical-rising sash may be raised to a maximum 16" operating height for
proper airflow between 60-100 fpm. The airflow requirements should be sized
for the 16" operating height. The sash stops allow the loading height to be
increased to 28" only for loading equipment. See Chapter 2 for airflows.
The Modular Neutrodine Filtration
Under normal conditions, the air quality at the safety filter (upper most position
per Figure 5-2) is purer than the laboratory. The embedded sensors inform the
user when the air quality after passing through the first layer of modular
Neutrodine filters contain an excessive level of chemicals called chemical
breakthrough. Neutrodine filtration utilizes a universal media allowing
simultaneous handling of solvents, acids, and bases with one filter with spaces to
enhance adsorption. The maximum acceptable concentration of contamination at
the filter exhaust, to comply with the NFX 15211, should never exceed 1% of the
TLV of the exhausted chemical. In order to provide a reliable solution to monitor
the exhausted air quality, the sensors were tested within a large range of
conditions over a period of several years. These sensors are located on the control
panel and air is sampled in two filter stages, the primary and the safety filter, in
order to inform the user when the primary filter is saturated and can no longer
adsorb additional contaminants. The filtered hood operates without risk as the
user is always protected by the redundant safety backup filter.
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