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09-01-2013, 07:58 PM
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#1
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Rivet Master
1999 34' Excella
Currently Looking...
Hillsboro
, Texas
Join Date: Feb 2013
Posts: 6,408
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New convection assist fans
Made this bracket, mounted fans, fused and running...
__________________
Peace and Blessings..
Channing
WBCCI# 30676
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09-01-2013, 08:02 PM
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#2
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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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.........
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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09-01-2013, 08:05 PM
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#3
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Rivet Master
1999 34' Excella
Currently Looking...
Hillsboro
, Texas
Join Date: Feb 2013
Posts: 6,408
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Quote:
Originally Posted by lewster
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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Thanks, Lewster! If this proves to improve cooling, I will move them as you suggest... This is just "proof of concept"...
__________________
Peace and Blessings..
Channing
WBCCI# 30676
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09-10-2013, 03:52 PM
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#4
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,668
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Quote:
Originally Posted by lewster
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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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.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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09-10-2013, 04:06 PM
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#5
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Rivet Master
1999 34' Excella
Currently Looking...
Hillsboro
, Texas
Join Date: Feb 2013
Posts: 6,408
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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?
__________________
Peace and Blessings..
Channing
WBCCI# 30676
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09-10-2013, 04:40 PM
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#6
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,668
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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.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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09-10-2013, 07:07 PM
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#7
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Rivet Master
1966 24' Tradewind
1995 34' Excella
Lynchburg
, Virginia
Join Date: Jun 2006
Posts: 4,225
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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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09-10-2013, 07:18 PM
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#8
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Rivet Master
1979 31' Sovereign
Northeastern
, Kentucky
Join Date: Feb 2011
Posts: 627
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Quote:
Originally Posted by lewster
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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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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09-10-2013, 07:31 PM
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#9
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,668
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Quote:
Originally Posted by KYAirstream
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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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.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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09-10-2013, 07:49 PM
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#10
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Rivet Master
1979 31' Sovereign
Northeastern
, Kentucky
Join Date: Feb 2011
Posts: 627
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You're probably right.
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09-10-2013, 09:13 PM
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#11
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3 Rivet Member
1994 21' Sovereign
Paradise Valley
, Arizona
Join Date: Jun 2013
Posts: 135
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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?
__________________
WBCCI# 2520 AIR# 77458 Ken and Ben the Saint Paradise Valley, Arizona
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09-10-2013, 09:40 PM
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#12
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,668
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Quote:
Originally Posted by kmaggard
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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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.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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09-10-2013, 09:46 PM
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#13
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Rivet Master
1999 34' Excella
Currently Looking...
Hillsboro
, Texas
Join Date: Feb 2013
Posts: 6,408
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Quote:
Originally Posted by dznf0g
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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Please be kind and FUSE your power positive wire.
__________________
Peace and Blessings..
Channing
WBCCI# 30676
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09-10-2013, 09:50 PM
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#14
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,668
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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.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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09-10-2013, 11:30 PM
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#15
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by dznf0g
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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Right !.......sort of.......... I always place these fans directly on the highest vent opening which is the hot air exhaust, whether that is on the upper side wall or under the fridge roof vent.
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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09-10-2013, 11:42 PM
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#16
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Rivet Master
1978 28' Ambassador
Morada
, California
Join Date: Jan 2006
Posts: 1,584
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Get one of these kits...I got one & it works great...!
Snyders RV Refrigeration - Home
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Ray & Pat; Morada, CA
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09-11-2013, 05:40 AM
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#17
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Quote:
Originally Posted by TouringDan
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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Dan,
Our 63 Safari had a floor vent also, one computer fan mounted inside on the screen made a 5-10* difference on hot days. It's really surprising how much cooler the air is under the trailer.
Bob
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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09-11-2013, 06:44 AM
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#18
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Rivet Master
1997 34' Limited
1970 27' Overlander
South of Atlanta
, Georgia
Join Date: Sep 2009
Posts: 1,709
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I have one of the Snyder's kits and it does work well. It consists of a PVC gutter which spans the cooling fins with a muffin fan mounted below it blowing up. It is thermally switched and fused. It is effective and has lowered my fridge temps considerably. On the highest cooling setting the fridge compartment has had temps as low as 29f this summer. That said, I am concerned that if the fan fails, all airflow will be blocked over the cooling fins. Because of this concern, I am going to remove it and place a larger fan just under the roof vent.
__________________
Craig and Carol
1997 34' Excella 1000
1970 27' Overlander, International
2009 Ford F150 5.4L
ProPride hitch with 1400# bars
AIR 41028
TAC GA-8
WBCCI 10199
Past President Southeastern Camping Unit (12)
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09-11-2013, 08:58 AM
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#19
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by Aviator
I have one of the Snyder's kits and it does work well. It consists of a PVC gutter which spans the cooling fins with a muffin fan mounted below it blowing up. It is thermally switched and fused. It is effective and has lowered my fridge temps considerably. On the highest cooling setting the fridge compartment has had temps as low as 29f this summer. That said, I am concerned that if the fan fails, all airflow will be blocked over the cooling fins. Because of this concern, I am going to remove it and place a larger fan just under the roof vent.
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Good idea!
I stopped using Stu's kits due to the small size of the fan and it's limited airflow, and for the exact reason that you brought up. I also do a lot of larger RV fridges that require significantly more airflow that the kit provides....hence the multiple fan installations.
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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