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03-30-2015, 10:11 PM
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#1
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Junior Member
Join Date: Mar 2015
Posts: 8
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Bathroom vent blowing IN rather than OUT
Hi,
I have a 30-foot 1993 Pace Arrow gas motorhome that's in very good condition.
However, I just discovered that the bathroom vent fan blows air IN, rather than OUT. So, I'm not able to suck bathroom odors and hot water moisture from the shower out of the bathroom.
I went on top of the RV roof to check things out.
It looks like the unit was originally installed this way, but I don't know why. Because I thought the purpose of the bathroom vent fan was to blow things out, rather than old air in.
The fan unit has two wires.
If I was able to reverse the wires, would the fan then operate correctly?
Would this be a pretty simple job to do?
Thanks!
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03-30-2015, 10:15 PM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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Yes, reversing the wires should change direction of the fan's rotation. Someone might have disconnected it to clean it and then hooked it up wrong.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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03-30-2015, 10:23 PM
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#3
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Or you could install a double pole double throw switch and be able to run it both in and out. Simple to do and a permanent answer to your "problem". In fact some come that way.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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03-30-2015, 10:26 PM
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#4
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Moderator Emeritus
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2012
Location: Lone Star State
Posts: 19,203
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Our last TT had a reversable fan in the bedroom. It would turn on and off based on pre-set tempurature too.
There were 3 switches on the fan body (speed dial, temp dial and 3 position rocker for on-off-on in reverse). The wall switch was just master on-off.
Are there any switches on the fan body?
If not, then swapping the wires on the DC motor will reverse the fan.
Best luck
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03-31-2015, 07:41 AM
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#5
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Standard bathroom fan uses a Permanent Magnet motor. (So does Fantastic Fan) reversing wires reverses motor
I use computer fans..Reverse the wires..They do not work.
__________________
Home is where I park it!
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03-31-2015, 07:42 AM
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#6
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Senior Member
Join Date: Sep 2012
Posts: 4,232
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Maybe someone replaced the fan blade and it was the wrong one. Or replaced the motor. The blades only rotate on way.
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03-31-2015, 07:48 AM
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#7
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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My toilet room fan will blow in either direction depending on where I have the selector switch set to.
I removed the OEM toilet fan which only ran in one direction and one speed and replaced it with the Heng Vortex II Upgrade Kit.
Excellent and easy installation.
Dr4Film ----- Richard
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03-31-2015, 08:43 PM
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#8
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Senior Member
Monaco Owners Club Coastal Campers
Join Date: Mar 2012
Posts: 2,164
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Quote:
Originally Posted by Dr4Film
My toilet room fan will blow in either direction depending on where I have the selector switch set to.
I removed the OEM toilet fan which only ran in one direction and one speed and replaced it with the Heng Vortex II Upgrade Kit.
Excellent and easy installation.
Dr4Film ----- Richard |
Does it fit the fantastic vent dome?
does it move more air?
Jeff
2001 Dynasty Regent tag axle
Cummins 350 8.3 ISC
__________________
Jeff
2001 Monaco Dynasty tag axle
2018 Jeep Grand Cherokee
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04-01-2015, 07:18 AM
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#9
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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Jeff,
Yes, it fits any 14 inch by 14 inch vent opening.
I have an original Fantastic Fan in my Bathroom and now the Heng Vortex II in the toilet room to compare and I believe that they move the same amount of air at the same noise level.
My old small one speed fan in the toilet room was actually nosier especially when one of the blades would hit the screen. Plus you had this little motor and small fan blade in a huge 14 X 14 inch opening whereas the Heng Vortex has a shroud around the huge multi-bladed fan.
It was such a huge improvement in venting the toilet room that we have to clean the screen on the Heng Vortex a lot more often than the Fantastic Fan but then they are in different rooms too.
Dr4Film ----- Richard
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04-02-2015, 11:53 AM
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#10
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Senior Member
Join Date: Jul 2011
Posts: 1,144
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Sometimes, the fan blade has been replaced. Sun damages them over time. When the blade is replaced, you can install it upside down. Could that be what happened?
__________________
2004 Tiffin Allegro 27.5 ft. P32 18,000 lb. GVW. 8.1 liter. Workhorse chassis built May 2002. 35,500 miles. 2012 Jeep Liberty Toad. RVi2 brake unit.
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04-02-2015, 12:09 PM
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#11
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Moderator Emeritus
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2012
Location: Lone Star State
Posts: 19,203
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Quote:
Originally Posted by Full.Monte
Sometimes, the fan blade has been replaced. Sun damages them over time. When the blade is replaced, you can install it upside down. Could that be what happened?
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Errrr, a rotating fan's blade angle does not change if just the fan blade set is flopped over...and the hub probably wouldn't fit anyway 
But a new fan blade set could have a reversed angle.
Safe travels
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04-02-2015, 12:10 PM
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#12
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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My Fantastic bathroom fan will do the same thing so I just reach up and toggle the switch to OUT from IN. Works every time.
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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