Slowing the speed of Dometic Fan-tastic fan?

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    Maybe most people are OK with the speed of the Dometic fan but I feel like the lowest speed is still faster than I’d like. Ideally for me it would go fast enough to remove CO2 but not so fast that you feel a distinct breeze. I’m thinking about adding another resistor and a switch to bypass it, allowing me to have a high and low range of speeds. If anyone has attempted something like this, I’d love to hear how it went. I did a quick test of the existing resistors in the fan and it looks like there is a .3, 3, and 4 ohm resistor but I’ll need to double check this and the resulting voltage if I decide to dive into this project. I’ll probably get an assortment of resistors so I can see what speeds I can get without stalling the fan. Thoughts?




    I installed one of these after seeing something similar in a video.

    RioRand™ Upgraded 6V-90V 15A DC Motor Pump Speed Controller – (product on Amazon)

    I couldn’t find the original video but here’s a similar install. Search for this on Youtube. (I’d post the link but that and a picture make my post disappear.)

    Fantastic Vent Relocation/Speed Control Upgrade: Four Wheel Camper Shell Buildout

    I think there’s only one corner that it can fit in so you just have to make it work there. I don’t remember needing to cut any plastic but the circuit board with mine was a little too big to fit like in the video above and had to be installed slanted and just hot glued in place. A little searching might lead you to a slightly smaller one that will fit better (easier) but the one above was fine.

    The way it’s wired, which I think is correct, means the 1-2-3 speed switch on the fan gets by-passed and just needs to be anywhere but ‘0’ to work. The rotary knob will make it go from barely on to what was speed ‘3’ before. I leave mine on low and turn it off and on at a 12 volt switch panel on the shelf, increasing the speed if needed. It can run much quieter now and was well worth the effort.



    Mike, thanks for the exact part and info I needed! I’ll be ordering this today.

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