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Old 05-23-2017, 03:06 PM   #1
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Non-AC Cooling

The thought came through my coconut -- yeah, I know, it's dangerous to think.

Anyway, why not mount a radiator cooling fan in the roof vent? I found some 16" push-pull fans like one would install on your vehicle radiator. You could install a rheostat in line to control the speed and/or direction.

Thoughts?
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Old 05-23-2017, 03:14 PM   #2
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That's what I've been using in the warmer months. I grabbed a rad fan from a Subaru Outback. It can really move air! I then connected it to a PWM motor controller for speed control. While it can turn either way, it does best in one direction, which suits me fine because the fan is behind a bug screen. Fans do best sucking through bug screens instead of blowing against them.
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Old 05-23-2017, 03:24 PM   #3
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Pix of your mount? They'd help considerably. I already have a 12 VDC line run down one side of the bus.
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Old 05-23-2017, 03:26 PM   #4
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I don't have it installed right now, but I can assure you that it ain't anything sexy. Just a square chunk of 3/8" plywood with a hole cut out in the center and the fan screwed to the plywood. I'll be making something more permanent and pretty some time soon. It's near the top of the multi page to-do list
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Old 05-23-2017, 03:28 PM   #5
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Couple of these would be great. I've got a few myself. Two for the 40' bus and one for the shorty.
They DO take up a bit of clearance, but if you haven't lifted the roof you should have plenty of room. I know you probably don't wanna go this route, just throwing it out there for those out there following along, lurking, or googling.
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Old 05-23-2017, 03:35 PM   #6
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ECB, I'm talking about venting when sitting still. Those do-dads you have would be great when moving, but I'm not moving.
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Old 05-23-2017, 04:24 PM   #7
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ECB, I'm talking about venting when sitting still. Those do-dads you have would be great when moving, but I'm not moving.
They have low-amp motors driving fans in them. They're specifically made to cool the inside of an RV while its stopped, even in the rain.
But they CAN be used while moving, as well.
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Old 05-23-2017, 07:18 PM   #8
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I don't have it installed right now, but I can assure you that it ain't anything sexy. Just a square chunk of 3/8" plywood with a hole cut out in the center and the fan screwed to the plywood. I'll be making something more permanent and pretty some time soon. It's near the top of the multi page to-do list
I'd like to see this too. Sounds very efficient.
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Old 05-23-2017, 09:55 PM   #9
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radiator fans are highly inefficient and noisy... power consumption isnt part of their equation whemn designed... moving high volume of air at high static pressure is...

radiator fins (esp with an A/C comndensor in front) require a lot of static Push or ability to pull against a vacuum...

theres much better blade shape and motor type to use for moving volume of air at low pressure as is the case when ventilating..

-Christopher
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Old 05-24-2017, 03:44 AM   #10
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