User Manual
34
Containment efficiency of the enclosure
Air face velocity
The documentation
Every Erlab
®
Erlab
®
products are in compliance with the following standards which guarantee your total protection.
The international standards
France : AFNOR NF X 15-211 : 2009 USA : ANSI/AIHA Z9.5
ASHRAE 110 : 1995
• The chemical name, its formula, its CAS number, its boiling
point, its molecular weight, its saturation vapour pressure
• The appropriate filter reference and its retention capacity
during the normal operation phase
• The type of saturation detection system for the filter(s)
• The maximum quantity
of the chemical that can
be introduced within the
enclosure
• The name of the test laboratory having
performed the test
To prove this efficiency, a test is carried out following the
protocol described in the standard.
SF6 (Sulfur Hexafluoride) tracer gas emissions are made
into the enclosure. A grid composed of sensors is placed
in front of the working openings. Some samplings are done
at the grid. Based on the emitted gas concentration and
the samplings done (which will allow the determination
of an average operator exposure to this tracer gas), it is
possible to determine a containment performance level of
the filtration fume hood.
The containment threshold specified by the NFX 15-
211:2009 standard imposes a maximum concentration of
0.1 ppm of SF6 gas at the measuring points on the grid.
It represents the fume hood capacity to create a dynamic barrier between
the operator and the handling.
For filtration fume hoods with fixed front panel, the air face velocity at any point of the front
openings must be between 0.4 and 0.6 m/s. They must be equipped with a permanent monitoring
system for the air face velocity which also acts as a real time containment indicator.
It is defined by the fume hood capacity to maintain chemical vapors or
particles within the enclosure without any propagation in the laboratory
environment.
Filtration fume hoods must be delivered with a booklet containing an
exhaustive list of chemicals, certified by the manufacturer, that can be
handled into the filtering fume hood in the conditions described in the
AFNOR NF X 15-211: 2009 standard. The following information must be
indicated in the booklet for each chemical listed:
Erlab
®
has created its own booklet called the CHEMICAL LISTING. This booklet contains a list of
approved chemicals indicating analysis data for about 700 molecular substances commonly used
in laboratories. This booklet is delivered with each unit, as per the requirements of the AFNOR
NF X 15-211: 2009 standard.
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