I suppose many people are satisfied with Heng's "add on" vent fans. We bought two for our Springdale, installed one in the bath and when we tried it, we were very disappointed that it was so loud. I removed it, returned both of them and bought a Fantastic reversible 4000 series 3 speed vent for the bath. It was significantly less noisy and moved more air. We moved that Fantastic fan to the Cougar's bathroom when we traded. Actually, we knew we were going to upgrade/trade when the tree fell on our Springdale, so while rebuilding the roof, I asked CW not to reinstall the Fantastic, but to go back to the original "small motor fan". It seemed to make economic sense to me, not to buy another fan for the Cougar. Both of the Heng fan systems seem (to me) to be a compromise. Compared to the "factory fan", more air movement, more noise, but less "hassle" than changing the entire vent assembly.
As for installing a 110 volt fan in the bedroom vent, that's an option. Depending on how often you "dry camp" it may be more versatile to install a DC fan so you can use it when not connected to shore power. It depends on your "style of camping" as to whether running the wires for DC or using the existing AC wires works best for you. With the Fantastic fan motors, they seem to be just as reliable as AC motors, so I wouldn't worry much about reliability, rather its more about your use and desires.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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