Reply
 
Thread Tools Display Modes
 
Old 05-23-2017, 03:06 PM   #1
Bus Crazy
 
CaptSquid's Avatar
 
Join Date: Nov 2015
Location: Billings, MT
Posts: 1,261
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
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?
CaptSquid is offline   Reply With Quote
Old 05-23-2017, 03:14 PM   #2
Bus Crazy
 
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,693
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
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.
__________________
My build page: Armageddon - The Smell of Airborne Rust
jazty is offline   Reply With Quote
Old 05-23-2017, 03:24 PM   #3
Bus Crazy
 
CaptSquid's Avatar
 
Join Date: Nov 2015
Location: Billings, MT
Posts: 1,261
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
Pix of your mount? They'd help considerably. I already have a 12 VDC line run down one side of the bus.
CaptSquid is offline   Reply With Quote
Old 05-23-2017, 03:26 PM   #4
Bus Crazy
 
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,693
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
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
__________________
My build page: Armageddon - The Smell of Airborne Rust
jazty is offline   Reply With Quote
Old 05-23-2017, 03:28 PM   #5
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 21,558
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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.
__________________
.
Roll Your Own Build Thread
EastCoastCB is online now   Reply With Quote
Old 05-23-2017, 03:35 PM   #6
Bus Crazy
 
CaptSquid's Avatar
 
Join Date: Nov 2015
Location: Billings, MT
Posts: 1,261
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
ECB, I'm talking about venting when sitting still. Those do-dads you have would be great when moving, but I'm not moving.
CaptSquid is offline   Reply With Quote
Old 05-23-2017, 04:24 PM   #7
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 21,558
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
Quote:
Originally Posted by CaptSquid View Post
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.
__________________
.
Roll Your Own Build Thread
EastCoastCB is online now   Reply With Quote
Old 05-23-2017, 07:18 PM   #8
Bus Nut
 
warewolff's Avatar
 
Join Date: Sep 2016
Location: NY
Posts: 475
Year: 2000
Coachwork: Carpenter
Chassis: International 3800
Engine: T444E
Quote:
Originally Posted by jazty View Post
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.
__________________
Roads? Where we're going, we don't need ... roads.
warewolff is offline   Reply With Quote
Old 05-23-2017, 09:55 PM   #9
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 12,860
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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
cadillackid is offline   Reply With Quote
Old 05-24-2017, 03:44 AM   #10
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 21,558
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15


__________________
.
Roll Your Own Build Thread
EastCoastCB is online now   Reply With Quote
Old 05-24-2017, 07:44 AM   #11
Bus Crazy
 
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,693
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
Man.. From $130 up to $360 for the fan.. The lower end of the price range isn't all that bad for having trim pieces and all. Best I can tell they pull 3 amps on high, which is also nice. It's a shame that the "Technical Information" section on the Fantastic Vents website doesn't actually have any technical information..
__________________
My build page: Armageddon - The Smell of Airborne Rust
jazty is offline   Reply With Quote
Old 05-24-2017, 12:11 PM   #12
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 21,558
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
Quote:
Originally Posted by jazty View Post
Man.. From $130 up to $360 for the fan.. The lower end of the price range isn't all that bad for having trim pieces and all. Best I can tell they pull 3 amps on high, which is also nice. It's a shame that the "Technical Information" section on the Fantastic Vents website doesn't actually have any technical information..
The fantastic brand uses the least amps, by a good bit.
I got mine NIB for $50 each. Just watch ebay. Seller didn't know what they had!
I scored three of them.
On my folks' RV, the roof vent is one of the MOST used features.
__________________
.
Roll Your Own Build Thread
EastCoastCB is online now   Reply With Quote
Old 05-24-2017, 12:17 PM   #13
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 12,860
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
im even thinking about changing my hatch to a fantastic roof vent... i could have a hhoiuse battery and on those hot days leave the fantastic turned on to pull the heat out.. so when I get in to drive my A/C has an easier time of it.. thats assuming that you can completely seal closed a fantastic when you are driving.

theres a ton of times when RVing that the roof vent would be of beneficial use..
-Christtopher
cadillackid is offline   Reply With Quote
Old 05-24-2017, 12:30 PM   #14
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Somewhere I recall a description of what sounded like a clever venting installation. One pair of small computer fans drawing air in low...and another pair exhausting the roof. Low power usage and apparently a quicker exchange as the lower pair somewhat pressurized the space.
Tango is offline   Reply With Quote
Old 05-24-2017, 02:00 PM   #15
Bus Crazy
 
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,693
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
Quote:
Originally Posted by EastCoastCB View Post
I got mine NIB for $50 each. Just watch ebay. Seller didn't know what they had!
Holy schnitzel.. If I could score them for that price I would definitely jump on it. However, it's already hot enough to warrant running a fan and I'm not currently in a position to spend that chunk of change. The rad fan worked like a champ and with the PWM controller can be run very quietly. I'll be popping that son of a gun in soon.

I've been thinking about utilizing an unused Arduino to turn on and control the fan speed depending on the indoor and outdoor air temperature.

I see it working like this:
- Set a desired indoor temperature
- IF the interior air temp is higher than the desired temp AND the interior air temp is hotter or equal to the exterior air temp THEN turn on the fan.

That should work well for spring and fall.
It would also be nice to set an upper temperature threshold where the fan ignores the temperature delta and runs the fan on high to create a breeze, which would be nice for the summer.

Similar to what the $300+ Fantastic fans do...
__________________
My build page: Armageddon - The Smell of Airborne Rust
jazty is offline   Reply With Quote
Old 05-24-2017, 02:05 PM   #16
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 21,558
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
Quote:
Originally Posted by jazty View Post
Holy schnitzel.. If I could score them for that price I would definitely jump on it. However, it's already hot enough to warrant running a fan and I'm not currently in a position to spend that chunk of change. The rad fan worked like a champ and with the PWM controller can be run very quietly. I'll be popping that son of a gun in soon.

I've been thinking about utilizing an unused Arduino to turn on and control the fan speed depending on the indoor and outdoor air temperature.

I see it working like this:
- Set a desired indoor temperature
- IF the interior air temp is higher than the desired temp AND the interior air temp is hotter or equal to the exterior air temp THEN turn on the fan.

That should work well for spring and fall.
It would also be nice to set an upper temperature threshold where the fan ignores the temperature delta and runs the fan on high to create a breeze, which would be nice for the summer.

Similar to what the $300+ Fantastic fans do...
FWIW the seller had more, so I posted a link on here for others. Another member snatched up the last one they had.
But they pop up from time to time like that.
The basic $120 model is pretty nice, and the trim ring coming with it is pretty cool.
I'm either going with a rooftop ac and one vent on my shorty, or two roof vents and a window unit in the rear. Probably the latter.
Fantastic sell the same vent without a fan or motor, just a static vent, for around $40. could add a small, efficient fan and probably save some money, just a thought.
__________________
.
Roll Your Own Build Thread
EastCoastCB is online now   Reply With Quote
Old 05-24-2017, 02:12 PM   #17
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 12,860
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
can the vents be closed off and sealed when you want t osay run Air-COnditioning.. or like me in the great north in winter..
-Christopher
cadillackid is offline   Reply With Quote
Old 05-24-2017, 02:24 PM   #18
Bus Nut
 
dredman's Avatar
 
Join Date: Dec 2014
Location: Birmingham Al
Posts: 600
Year: 2003
Coachwork: Blue Bird
I will put in my plug for the fantastic fan - best $250 I have spent - but I got the DElux model - push a button for close/open, has a thermostat, and a rain sensor that closes the top (good thing too, now that it is mounted over my bed) push/pull directional, 3 speeds can pull all the heat out in a couple minutes.
__________________
My Skoolie Story on YouTube
dredman is offline   Reply With Quote
Old 05-24-2017, 02:47 PM   #19
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 21,558
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
Quote:
Originally Posted by cadillackid View Post
can the vents be closed off and sealed when you want t osay run Air-COnditioning.. or like me in the great north in winter..
-Christopher
Yeah they even have an easily replaceable gasket. they seal up well, especially when coupled with a rain cover.
__________________
.
Roll Your Own Build Thread
EastCoastCB is online now   Reply With Quote
Old 05-25-2017, 04:11 PM   #20
Bus Crazy
 
CaptSquid's Avatar
 
Join Date: Nov 2015
Location: Billings, MT
Posts: 1,261
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
Quote:
Originally Posted by cadillackid View Post
can the vents be closed off and sealed when you want t osay run Air-COnditioning.. or like me in the great north in winter..
-Christopher
Winter? Ohio? Yeah, right! Son, you don't KNOW winter until you've survived the Great Plains winters.
CaptSquid is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 05:02 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×