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Old 08-10-2015, 07:06 AM   #29
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I have pushers and pullers. I experimented with this as an extension of my knowledge borrowed from automotive radiator fan configurations on extreme applications....like police cars where there are high idle times with A/C on (like at accident scenes).
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Old 08-11-2015, 10:28 AM   #30
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My 2007 75th Anniversary 19' Bambi has the switch to turn on the refrigerator fan. Question is, how do I know when to turn it on? At what outside temperature does an automatic fan go on? I'm in California and so far haven't camped during very hot days, but have wondered when I should turn on that fan.
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Old 08-11-2015, 10:43 AM   #31
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Originally Posted by RyeL View Post
My 2007 75th Anniversary 19' Bambi has the switch to turn on the refrigerator fan. Question is, how do I know when to turn it on? At what outside temperature does an automatic fan go on? I'm in California and so far haven't camped during very hot days, but have wondered when I should turn on that fan.
My thermostatically controlled switch comes on when the ambient temp is about 75*. Now, mind you, the switch is inside the compartment, so it's actual temp is somewhat higher. I have found that above 75* ambient is where the interior compartment temp requires ventilation. If the sun is beating down on that area, the switch might come on at 70* or below, ambient. In the shade it comes on at 75*
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Old 07-07-2016, 09:12 PM   #32
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Hi Lewster,
I have a 2016 Bambi sport and the fridge is warmer than I'd like it to be and the fan is so loud. We are hatching a plan now to replace the fan with a quieter model and I like some of the configurations pictured in this thread. Wondering what your final fan configuration ended up looking like?
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Old 07-08-2016, 07:00 AM   #33
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Unless the top door is completely blocked off, very little air will come in the bottom door as air takes the path of least resistance. So we totally blocked off the top hatch on our 2015 23D International Serenity and framed the three Noctua 120mm, Anti-Stall Knobs Design,SSO2 Bearing PWM Case Cooling Fan NF-S12A PWM fans from Amazon:

(https://www.amazon.com/Anti-Stall-Be.../dp/B00BEZZBFO)

This setup makes sure the air comes in at the bottom and takes the heat from the original Dometic refrigerator as well as our replacement Vitrifrigo DP1501iL Danfoss compressor refrigerator. We put in a relay that is triggered whenever the Danfoss compressor is running to also run the fans.

Works well even in the over 100 degree heat in the SouthWest.
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Old 07-08-2016, 08:29 AM   #34
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Switz,
I used two of the Noctua NF-P12 120mm x 25mm Cooling Fan 3-Pin - 1300 RPM; how do you tell which is the right fan for this application? Noctua offers a lot of choices. A little confusing for us non-engineering types.
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Old 07-08-2016, 08:46 AM   #35
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I think the misnomer people apply to this question is the fact that we want to stand in front of a fan and have the air pushed over us. In our case the fan is evaporating moisture off our skin and cooling is a function of evaporation. In the case of the frig we want to change the air surrounding the coils of the frig and thus improve convection cooling.

Even when it is over 90 degrees outside that 90 degrees is cooler than the 120+ degrees behind the frig.
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Old 07-08-2016, 08:31 PM   #36
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You can't suck a candle out with a straw but you can certainly blow it out with one. That said, the refrigeration system of the refrigerator (just like your home a/c) is actually extracting the heat out of the box and dissipating that heat off the coils you are trying to ventilate. Forcing cooler air across those coils will work better than trying to suck the heat off of them. Blowing air on them and sucking the heat out of the compartment will work the best.
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Old 07-09-2016, 06:32 AM   #37
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The Danfoss compressor of the Vitrifrigo refrigerator has a small fan blowing air across the coil. Thus the air movement caused by the three exhaust fans are pulling the hot air from the compressor to be pulled out at the top and cooler air to come in at the bottom.

The Dometic with the propane flame generated heat and the air movement helped the unit try and keep the contents cold.
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Old 07-12-2016, 03:57 PM   #38
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We went with two Noctua NP-PF12 fans configured to pull hot air out of the refrigerator rear compartment. Preliminary results are positive. The interior of the fridge cooled much faster. Click image for larger version

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Old 07-12-2016, 07:05 PM   #39
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So these fans are blowing out the compartment door at the bottom of the trailer, as opposed to pulling outside air in to help with ventilation out the roof vent?
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Old 07-12-2016, 09:30 PM   #40
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So these fans are blowing out the compartment door at the bottom of the trailer, as opposed to pulling outside air in to help with ventilation out the roof vent?
The 16 does not have a roof vent as it has a half-size fridge. There is a lower and upper access door, both on the sidewall of the trailer. These fans are located on the upper door and pull air up from the lower door and expel the warmer air out the upper door.
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Old 07-13-2016, 06:21 AM   #41
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You are correct Lewster there is no roof vent in the 16 Bambi sport so the hot air gets trapped in the top of the compartment behind the fridge and doesn't cool properly. The factory placed fan in the middle of the compartment isn't placed in a peak performance position so it just pushed warm air into a warmer area. The mod pulls got air out of the top vent which in turn pulls cooler air in through the bottom vent. I've attached a pic of the factory fan below. Click image for larger version

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Old 07-14-2016, 03:06 PM   #42
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Does anyone have a favorite efficient, quiet, model fan to recommend? I have a 2016 Bambi 16' with a on/off switch located inside. Looks like two fans pulling the air might be the answer to better air movement but wondering also about wattage vs original equipment. Thanks in advance!
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