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Old 09-01-2013, 08:58 PM   #1
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New convection assist fans

Made this bracket, mounted fans, fused and running...



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Old 09-01-2013, 09:02 PM   #2
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These fans are most efficient when pulling rather than pushing the air. The optimal place for the fans is at or on the fridge vent outlet; either at the roof vent or directly on the side vent. This way you are assured of pulling the heated air across the condenser and out of the vent without any possibility of it getting trapped due to inefficient plenum design.

Nice install, though.........
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Old 09-01-2013, 09:05 PM   #3
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Originally Posted by lewster View Post
These fans are most efficient when pulling rather than pushing the air. The optimal place for the fans is at or on the fridge vent outlet; either at the roof vent or directly on the side vent. This way you are assured of pulling the heated air across the condenser and out of the vent without any possibility of it getting trapped due to inefficient plenum design.

Nice install, though.........
Thanks, Lewster! If this proves to improve cooling, I will move them as you suggest... This is just "proof of concept"...
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Old 09-10-2013, 04:52 PM   #4
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These fans are most efficient when pulling rather than pushing the air. The optimal place for the fans is at or on the fridge vent outlet; either at the roof vent or directly on the side vent. This way you are assured of pulling the heated air across the condenser and out of the vent without any possibility of it getting trapped due to inefficient plenum design.

Nice install, though.........
I just moved mine. We've been in the 90s this week (upper today) and I noticed a lot of turbulence (verified with cigar smoke) with the fans down low, pointed up. I had an actual downdraft at both sides of the compartment. I immediately thought of CO being pushed back down from chimney top. Not good.
Made an aluminum bracket similar to CWF and mounted below the roof vent. I used two 4" muffin fans, which each move 75 cubic feet per minute, but I am sure the vent cover restricts that somewhat. Now have a nice pull throughout the cabinet. Will monitor any performance difference.

Sorry, no pics.....too darned hot to play around.
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Old 09-10-2013, 05:06 PM   #5
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Cool! Literally!

I did not have the smoky issue. However, am concerned about CO as well... Was it tough pulling roof vent or did you use another method?
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Old 09-10-2013, 05:40 PM   #6
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Channing, as much as I hated to, I pulled the refer. four hour job, start to finish, including fabricating the mounting bracket. I mounted the fans to the aluminum using rubber faced washers and mounted rubber grommets between the bracket and ceiling. Pretty darned quiet. While I was in there, I re-taped some joints and checked my previous bubble foil insulation job.
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Old 09-10-2013, 08:07 PM   #7
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All fan installers:

I am curious. How much of an improvement in fridge temperature did you get after you installed your fans?

I am planning on installing three 120 more fans (45 cfm/fan) at the vent entrance which is located in the belly pan. This location is the easiest for me to access.

Dan
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Old 09-10-2013, 08:18 PM   #8
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Originally Posted by lewster View Post
These fans are most efficient when pulling rather than pushing the air. The optimal place for the fans is at or on the fridge vent outlet; either at the roof vent or directly on the side vent. This way you are assured of pulling the heated air across the condenser and out of the vent without any possibility of it getting trapped due to inefficient plenum design.

Nice install, though.........
You mentioned at the roof or directly on the side vent. Are you referring to the access door in the side of the trailer that allows the inflow of air? This of course would be a lot easier to access than the roof vent.
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Old 09-10-2013, 08:31 PM   #9
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You mentioned at the roof or directly on the side vent. Are you referring to the access door in the side of the trailer that allows the inflow of air? This of course would be a lot easier to access than the roof vent.
If I may be so bold to answer for Lewster......I think he's talking about the units with both the inlet and outlet on the side of the trailer...not the top. So he's saying mount the fans on the hot air exit.
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Old 09-10-2013, 08:49 PM   #10
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You're probably right.
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Old 09-10-2013, 10:13 PM   #11
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How are you wiring the fans? Are they on a switch? Wired to the fridge? When do they run? Battery drain?
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Old 09-10-2013, 10:40 PM   #12
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How are you wiring the fans? Are they on a switch? Wired to the fridge? When do they run? Battery drain?
I wired both fans in parallel with a pair of wires running down to the access panel area. I run a manual switch and a thermal switch ( mounted in the chimney), both in the positive line. The power and ground are in the "H block" where the 12Volt feed is for the fridge.
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Old 09-10-2013, 10:46 PM   #13
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I wired both fans in parallel with a pair of wires running down to the access panel area. I run a manual switch and a thermal switch ( mounted in the chimney), both in the positive line. The power and ground are in the "H block" where the 12Volt feed is for the fridge.
Please be kind and FUSE your power positive wire.
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Old 09-10-2013, 10:50 PM   #14
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I've read that many times....but, the H-block is already fused. Any short will pop the self-resetting breaker on the refer circuit.
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