2.4.1 Flame screens should be:
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.1 designed in such a manner that they cannot
be inserted improperly in the opening;
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.2 securely fitted in openings so that flames
cannot circumvent the screen;
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.3 able to meet the requirements of these standards.
For flame screens fitted at vacuum inlets through which vapours cannot
be vented the test specified in 3.2.3 need
not be complied with; and
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.4 be protected against mechanical damage.