// CODE SNIPPET
403.9.2 Class 2 Air
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Recirculation of Class 2 air within
the space of origin shall be permitted. Recirculation or
transfer of Class 2 air to other Class 2 or Class 3 spaces
shall be permitted, provided the other spaces are used for
the same or similar purpose or task and involve the same
or similar pollutant sources as the Class 2 space. Transfer
of Class 2 air to toilet rooms shall be permitted. Recirculation
or transfer of Class 2 air to Class 4 spaces shall be
permitted. Class 2 air shall not be recirculated or transferred
to Class 1 spaces. Where using an energy recover
device, recirculation from leakage, carryover, or transfer
from the exhaust side of the energy recovery device shall
be permitted and the recirculated Class 2 air shall not
exceed 10 percent of the outdoor air intake flow.
[ASHRAE 62.1:5.16.3.2]
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