Connect External Exhaust Ducting; Determine The Cinema Projector Exhaust Cfm Value - Christie CP2220 Setup Manual

2.8

Connect External Exhaust Ducting

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, while 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 prevent 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 Installation Requirement Calculations
Airflow
Temperature
(CFM)
450 CFM
25°C or lower
greater than
600 CFM
and below 35°C
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.
Attempting to operate the cinema projector with
inadequate airflow can result in dangerous overheating of the cinema projector.
2-8
Altitude (above sea
level)
at or below 3000 feet
25°C at or below 10 000
feet
Never disable the vane switch.
Figure 2-6 Connect Exhaust
Ducting
Figure 2-7 Exhaust Duct Vane Switch
020-100476-05 Rev. 1 (05-2014)
Exhaust
Duct to
Outside
450 cfm
required*
Vane Switch
Top View into
Exhaust Duct
CP2220 Setup Guide