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IOM
THRC HF & LF
Partial Exhaust/Recirculation Mode
Note: The THRC units come with a removable Exhaust Cover Plate and a removable 6-inch (152mm) Duct Collar for
attachment to exhaust ducting (not included) to create a negative pressure room. lf the Exhaust Cover Plate is not
removed, the THRC units will operate in the 100% recirculation mode.
1. Remove the Exhaust Cover Plate located on top of the lsoClean® unit by taking off the four (4) screws and plastic caps
used to secure the cover to the THRC exhaust port.
2. Remove the 6-inch (152mm) duct collar underneath the top cover and flip the collar over.
3. Attach exhaust ducting (not included) onto the collar and fasten tightly with a round hose clamp (not included).
4. Mount the duct collar with ducting onto the THRC exhaust port using the four (4) screws that originally held the cover
plate. Note: Keep the top plate and plastic washers for re-assembly when needed.
5. The HEPA filtered exhaust air can now be vented to the outside or returned to the main HVAC system1. 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.
6. The lTHRC is designed to exhaust 100-300 CFM for the High Flow and 25-150 CFM for the Low Flow at the 6-inch
exhaust port. 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 THRC will exhaust approximately 300 CFM (510 m3/h) and
recirculate 500 CFM (850 m3/h) for the High Flow and exhaust approximately 150 CFM (254 m3/h) and recirculate 220
CFM (373 m3/h) for the Low Flow.
Total Exhaust Mode (Negative Pressure)
CAUTION: To reduce risk of re and to properly exhaust air, be sure to duct air outside - Do not vent exhaust air into
spaces within walls or ceilings or into attics, crawl spaces, or garages.
CAUTION: For General Ventilating Use Only. Do Not Use to Exhaust Hazardous or Explosive Materials and Vapors.
Note: The cover plate must be securely attached to the top of the THRC for the unit to run in the 100% exhaust mode.
An optional 8-inch (203mm) Exhaust Collar with Flange is available to convert the THRC unit to the 100% exhaust mode.
1. Remove the front exhaust grille by pulling down and lifting out.
2. Place the optional 8-inch (203mm) exhaust collar over the opening where the grille was removed and attach with the
screws included with the 8-inch collar.
3. Attach exible exhaust duct (not included) over the 8-inch collar and fasten tightly with a round hose clamp (not included).
4. The HEPA ltered exhaust air can now be vented to the outside or returned to the main HVAC system1. lf the unit is ducted
to an exhaust duct rather than directly to the outside, it must be veried that the exhaust duct is capable of handling the
exhaust air expelled by the unit.
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 TOACHIEVE 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 M3/H)
GREATER THAN THE SUPPLY (WHICHEVER IS GREATER).
Achieving Negative Pressure
1. The THRC unit is designed to exhaust 100-300 CFM (High Flow unit) or 25-150 CFM (Low Flow unit) 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.
2. lf an exhaust volume greater than 300 CFM (800 unit) or 150 CFM (400 unit) is required to create a negative pressure
room, the optional 8-inch (203.2 mm) 100% exhaust collar should be used.
3. The attachment of ductwork to the exhaust port decreases the air volume exhausted through the port. The magnitude of the
decrease varies depending on the length and type of duct as well as unit configuration.
1 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 lters should be installed in the exhaust duct leading from the room to the general
ventilation system.
