
Appendix B. CNF4 Heater/Ventilator
B-12
pulling it straight out. Inspect the fan inside for any object that might impede
the fan’s rotation. Upon completing the inspection, put the filter and the cover
back in place.
B.5.3 Replacing the Filter for the Ventilator
The filter needs to be checked for every 6 to 12 months. Remove the black
cover at the bottom side of the ventilator by prying it open with a small flat-
head screw driver or by pulling it straight out. Inspect the filter for dust and
particles that might impede the air flow into the ventilator. The filter can be
cleaned with warm clean water, or can be replaced with the new one. You can
purchase the replacement filters from Campbell Scientific (CSI p/n 26010, a set
of 5).
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