Determine The Cinema Projector Exhaust Cfm Value - Christie CP2230 User Manual

Connect the existing outside-venting ductwork to the 8 inch
diameter exhaust port on the top of the cinema projector.
Confirm that there are no obstructions or bends in the ducting,
all air intakes are free of obstructions, and the vane switch at
the exit duct moves freely.
The pre-installed outside-venting duct should be rigid at the
cinema projector and must also include a heat extractor and
blower that maintains a minimum of 450 CFM* when the
cinema projector is operating at less than or equal to 25°C
ambient and less than 3,000 feet, when measured at the cinema
projector exhaust opening.
WARNING
• *600 CFM is required in projection rooms with an
ambient temperature above 25°C or located at an
elevation greater than 3000 feet above sea level.
• At minimum, a 10" long, strong metal duct must be installed at the cinema projector to pre-
vent glass shards from exiting the duct in the event of a lamp explosion.

2.8.1 Determine the cinema projector Exhaust CFM Value

Use an airflow meter to measure the ft/min or ft/
sec at the rigid end of the open exhaust duct that
connects to the cinema projector. Take the
measurement at the very end of the duct without
the cinema projector connected. Use this formula
to determine the CFM value for the cinema
projector:
Measured linear ft/min x 0.35 = CFM
Table 2.1 Airflow Requirement
Lamp Type
2.0 kW
3.0 kW
4.5 kW
6.0 kW
Add an extractor or a booster if there is insufficient airflow. Do not mount the extractor on the cinema projector
as this may introduce some vibration into the image. NOTE: To prevent the cinema projector from overheating
or becoming unsafe, an alarm sounds if the duct is obstructed or a fan fails. It is recommended that you
regularly verify that the exhaust is functioning correctly.
with inadequate airflow can result in dangerous overheating of the cinema projector.
CP2230 User Manual
020-100430-07 Rev. 1 (05-2014)
Min.
Airflow (CFM)
Required
450 CFM
450 CFM
600 CFM
600 CFM
Never disable the vane switch. Attempting to operate the cinema projector
Installation and Setup
Exhaust
Duct to
Outside
450 or 600
CFM
required*
Default Weight Position 450 CFM
Weight Position 600 CFM
Vane
Switch
Top View into
Exhaust Duct
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