Troxler ICO 4740, Manual Of Operation And Instruction, Page: 53 / 171

ICO 3-19
NOTE
You can adjust the airflow by moving the louvers on
the exhaust plenum box, which is located under the
black box at the top of the furnace. (Closing the
louvers increases the airflow.) However, the louvers
are preset at the factory and should not need
adjustment.
Figure 13: Exhaust Plenum Box and Louvers
MEASURING THE AIRFLOW LIFT
NOTE
Airflow lift is measured using the exhaust pipe
connected to the furnace. Be sure this pipe is
connected to the unit and the exhaust system before
proceeding.
1. Turn on the unit and leave the door open.
2. Let the unit stabilize for at least fifteen minutes. (Do not
close or latch the door during this period.)
3. Check to see if the environment is appropriate.