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Old 09-02-2017, 03:55 PM   #1
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Garage exhaust system for generator exhaust

Just when you think you have it all figured out you get another challenge.
I built a large metal building to store my 2015 DSDP
It's plenty big and has 50 amp service so I keep it plugged in.
I set auto gen start in the event I lose power.
We'll sometime over the past week I lost power so generator kicked in, perfect.
With one exception, I don't have the generator exhausted out of garage.
I've got one dirty RV and soot everywhere.
Has anyone put a exhaust vent in their RV building.
If so what did you use and where did you get it.
The exhaust tip is an odd size so I'm looking for something that fits
Thanks in advance
Dave H
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Old 09-02-2017, 04:06 PM   #2
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Quote:
Originally Posted by Golferdave78 View Post
Just when you think you have it all figured out you get another challenge.
I built a large metal building to store my 2015 DSDP
It's plenty big and has 50 amp service so I keep it plugged in.
I set auto gen start in the event I lose power.
We'll sometime over the past week I lost power so generator kicked in, perfect.
With one exception, I don't have the generator exhausted out of garage.
I've got one dirty RV and soot everywhere.
Has anyone put a exhaust vent in their RV building.
If so what did you use and where did you get it.
The exhaust tip is an odd size so I'm looking for something that fits
Thanks in advance
Dave H
Hi Dave, something seems wrong with your generator operation/running......you should not have a mess and soot from it running......check this place out garage exhaust hose you might find what you need.....
Also go to Amazon and type in the search bar "Garage Exhaust Hose" you will find a lot of items.....
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Old 09-02-2017, 07:30 PM   #3
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Dave, the hose "palehorse89" linked to, connected to a dryer wall vent with flapper would probably do the trick. The dryer vent with flapper is designed to take the heat and can be mounted in your exterior wall, with a flapper to prevent pest intrusion.

Lastly.....Dang you....for having an indoor spot for your RV. I could have probably saved myself hundreds of hours of waxing and cleaning if I had room for indoor storage.
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Old 09-02-2017, 08:01 PM   #4
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Custom built into building 36" exhaust fan set at 2300 CFM, it'll suck any fumes and dust out. Just got to remember to have an inlet open.

Overkill for dust but will help when repainting the lower half of the bus.
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Old 09-02-2017, 08:26 PM   #5
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Quote:
Originally Posted by palehorse89 View Post
Hi Dave, something seems wrong with your generator operation/running......you should not have a mess and soot from it running......check this place out garage exhaust hose you might find what you need.....
Also go to Amazon and type in the search bar "Garage Exhaust Hose" you will find a lot of items.....
The temperature range on that hose is 0 - 375 degrees F. I believe a generator under load will have a much higher temp exhaust. I use stainless steel flex pipe.
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Old 09-03-2017, 05:45 PM   #6
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Take a peek at post 13... The exhaust hose is from Napa, it's a commercial garage exhaust hose rated for very high temperatures. The rest is just heavy duty PVC, I've had this set up for a couple of years with no issues.
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Old 09-03-2017, 06:00 PM   #7
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We have a chimney extension for our current motorhome. It's a steel 90 degree that slips over the generator exhaust and us held on with a pin. The 90 degree goes into a 3" pvc tube and that's held on with bolts. The extra space makes a draft to help the fumes rise. I have two sections of it that when put in place runs all the exhaust to a few feet above the motorhome.

You could have the same set up with a flexible line to the roof.

There is also a system that uses a fan to draw fumes out, truck repair garages use it but you would need some sort of a switch that would come on when the generator starts.
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Old 09-03-2017, 06:00 PM   #8
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Wow, thanks for the reminder! You made me remember I left the Onan on auto start in my garage! First thing in the morning I have to turn it off.
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Old 09-03-2017, 07:48 PM   #9
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Quote:
Originally Posted by Golferdave78 View Post
Just when you think you have it all figured out you get another chDallenge.
I built a large metal building to store my 2015 DSDP
It's plenty big and has 50 amp service so I keep it plugged in.
I set auto gen start in the event I lose power.
We'll sometime over the past week I lost power so generator kicked in, perfect.
With one exception, I don't have the generator exhausted out of garage.
I've got one dirty RV and soot everywhere.
Has anyone put a exhaust vent in their RV building.
If so what did you use and where did you get it.
The exhaust tip is an odd size so I'm looking for something that fits
Thanks in advance
Dave H
Dave,

I use my generator has a whole house backup generator during power outages. Following are pics. MH stays in building with exhaust vented outside. One end of power wire plugs into plug near generator, the other end plugs into a installed plug in building. A flip of a few breakers and the whole house is powered.
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Old 09-03-2017, 08:18 PM   #10
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Living in Florida having a generator exhaust extension is part of our Hurricane plan. I simply purchased an 1-1/2" Electrical Conduit 90 degree curved elbow and another 1-1/2" ten foot piece and used these to move the exhaust under the garage door. Simple and cheap!
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Old 09-06-2017, 05:48 PM   #11
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Rotten-Red
Thanks for the pics
I found 1 1/2 flex stainless steel tubing online
Looks like what you have
I also have a 4" vent in side of storage building
I like the way you gapped up from 1 1/2 to 4"
What is that cork looking material you have wrapped around 1 1/2 in piping
Thanks
DH
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Old 09-06-2017, 09:02 PM   #12
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Quote:
Originally Posted by Golferdave78 View Post
Rotten-Red
Thanks for the pics
I found 1 1/2 flex stainless steel tubing online
Looks like what you have
I also have a 4" vent in side of storage building
I like the way you gapped up from 1 1/2 to 4"
What is that cork looking material you have wrapped around 1 1/2 in piping
Thanks
DH
DH, That material is just a piece of 2X6. I used a 4" hole saw to cut the main piece, then a 1-1/2" hole saw to cut out for the pipe. The red stuff is high temp silicone used to hold the donuts in place. On the inside donut I put a piece of velcro to seal tight against the 4" pipe.

I hope your 4" vent pipe is steel. Don't try to use PVC. I used that first and the heat deformed it. I had to replace it with the steel pipe.

Your welcome, I hope this all makes sense.
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Old 09-06-2017, 09:32 PM   #13
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Not to be too contrary but how long would the 50 amps be out of service that you would need to start your generator? Batteries fully charged should be good for a few weeks, doubt you'd lose power for that long?
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Old 09-06-2017, 09:58 PM   #14
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Not to be too contrary but how long would the 50 amps be out of service that you would need to start your generator? Batteries fully charged should be good for a few weeks, doubt you'd lose power for that long?
I think you misunderstand. I'm using the generator as a back up for the stick house during a power outage. Has nothing to do with the batteries in the MH.
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