Envirco Isoclean UV - Manual (Page 11)

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H
OSPI
-G
ARD
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I
SO
C
LEAN
®
and
I
SO
C
LEAN
®
UV
Operation Manual
3.6.1.4. The HEPA filtered exhaust air can now be vented to the outside or
returned to the main HVAC system
2
. lf the unit is ducted to an exhaust
duct rather than directly to the outside, it must be verified that the
exhaust duct is capable of handling the exhaust air expelled by the unit.
3.7. Negative Pressure
NOTE: CDC Guidelines recommend that rooms used for negative pressure isolation
should be single patient rooms with negative pressure relative to the corridor or
other areas connected to the room. The minimum pressure difference
necessary to achieve and maintain negative pressure that will result in airflow
into the room is 0.01 inch W.G. (2.5Pa) (a higher pressure is preferred). To
achieve this, the exhaust flow should be 10% or 50 CFM (85 m
3 /h) greater than
the supply (whichever is greater).
3.7.1. Achieving Negative Pressure
3.7.1.1. The lsoClean unit is designed to exhaust 100-300 CFM (170-510 m3/h)
when the 6-inch (152.4mm) exhaust collar is used. lt is recommended
that the unit be set on the high-speed setting when operating in this
mode to achieve maximum exhaust and negative pressure. At this
setting, the lsoClean will exhaust approximately 300 CFM (510 m
3 /h)
and recirculate 500 CFM (850 m
3
/h).
2
CDC recommends that air from negative pressure rooms be exhausted to the outside in accordance with federal, state, local or country
regulations. The air should not be recirculated into the general ventilation. ln certain cases in existing facilities, recirculation of air into the
general ventilation system is unavoidable and, in such cases, CDC guidelines state that HEPA filters should be installed in the exhaust
duct leading from the room to the general ventilation system.