Does The Fan Circulation Fan Always Run When Switched On Dometic Air Distribution Box # DMC43ZR?
Updated 02/03/2026 | Published 06/30/2024
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Question:
Will the fan continuously run with the compressor cycling on and off in order to maintain cooling temp? Or will the fun also cycle on and off during the cooling cycle? If the fan is on constantly, Is there a ductless system that does not keep the fan constantly on?
asked by: Andrew K
Expert Reply:
The Dometic Air Distribution Box # DMC43ZR when switched on the fan will constantly run to circulate air throughout the camper while the AC compressor will cycle on and off as needed for cooling. This is true for most manually controlled Dometic air distribution boxes and to get away from the fan running all the time you would need to have a Thermostat # DMC79FR and new air box installed which we do not carry at this time.
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Lazer S.
2/3/2026
Hey, were you able to find a ductless system that doesn’t keep the fan running constantly? Knowing what setup worked for you could help others looking for quieter cooling options.