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Appendix D. CNF4 Heater/Ventilator 2. Attach the heater/ventilator unit unto the bottom of the CNR4 sensor, using the three pan-head screws and washers, as shown in FIGURE D-2. Make sure that the pyranometer and the pyrgeometer windows are not scratched during the installation. FIGURE D-2. Attaching the CNF4 to CNR4 using pan-head screws and washers D-4