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Section 2: Installation and Setup
2.8
Connect External Exhaust Ducting
Connect the existing outside-venting ductwork to the 8 inch
diameter exhaust port on the top of the 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
projector and must also include a heat extractor and blower that
maintains a minimum of 450 CFM* when the projector is
operating at less than or equal to 25°C ambient and less than
3,000 feet, when measured at the projector exhaust opening.
• *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 projector to prevent glass shards
from exiting the duct in the event of a lamp explosion.
2.8.1 Determine the 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 projector. Take the measurement
at the very end of the duct without the projector
connected. Use this formula to determine the
CFM value for the projector:
Measured linear ft/min x 0.35 = CFM
Table 2.1 Airflow Requirement
Lamp Type
2.0 kW
3.0 kW
Add an extractor or a booster if there is
insufficient airflow. Do not mount the extractor
on the projector as this may introduce some vibration into the image. NOTE: To prevent the 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.
equate airflow can result in dangerous overheating of the projector.
2-8
Min.
Airflow (CFM)
Required
450 CFM*
450 CFM*
Never disable the vane switch. Attempting to operate the projector with inad-
Figure 2-7 Connect Exhaust Ducting
Figure 2-8 Exhaust Duct Vane Switch
D4K25 User Manual
020-100882-02 Rev. 1 (07-2012)
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