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Operation Manual
Page 8
3.7.1.2. If an exhaust volume greater than 300 CFM is required to create a
negative pressure room, the optional 8-inch 100% exhaust collar (Part
No. 11055) should be used as described in Section 3.6.
3.7.1.3. 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 its
configuration. For example, for a 10-foot run of standard flexible duct
containing two 90-degree bends, the exhaust reduction will be
approximately 100 CFM.
NOTE:
It is the responsibility of the purchaser and not Envirco Corporation to
ensure the room in which the unit is used is in compliance with CDC
Guidelines
4
for a negative pressure isolation room and monitored to
ensure its continuing performance.
3.7.2.
Difficulty Achieving Negative Pressure
The equipment may not be able to achieve or maintain negative pressure in
conformance with the CDC
Guidelines
4
due to building ventilation of rooms or air
leakage. The room should be inspected for air leakage through doors, windows,
plumbing and wall penetrations. Appropriate corrective action should be taken to
seal the leaks.
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4
CDC. Guidelines for Preventing the Transmission of Tuberculosis in Health-Care Facilities, 1994. MMWR, October 28, 1994; 43
(No. RR-13.)