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Where to locate furnace exhaust
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pcg



Joined: 31 Aug 2018
Posts: 405
City/Region: Sherwood
State or Province: OR
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: C-Quest
Photos: pcg
PostPosted: Tue Mar 26, 2019 5:02 pm    Post subject: Where to locate furnace exhaust Reply with quote

I’m soliciting more advice. I’m trying to decide where to place a forced air furnace in my 22 Cruiser project boat, and to some extent that depends on the best place for the exhaust gasses to exit. It would be nice to have exhaust gasses exit straight up a pipe through the rear cabin roof, but that will interfere with other items, like a dinghy stored up there and a stove vent.

Some of the furnaces I’ve looked at come with thru-hull fittings for the exhaust gases. I’ve also seen some instructions say that the exhaust gas should not exit underneath a window that can be opened. That starts to narrow things down.

I’m concerned about exhaust fumes getting drawn back into the boat with windows open, either when anchored or underway. I’d like advice or comments regarding the best place to route exhaust gasses, other than the rear of the cabin roof.

Thank you.

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hardee



Joined: 30 Oct 2006
Posts: 12632
City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
PostPosted: Tue Mar 26, 2019 5:19 pm    Post subject: Reply with quote

Most of the exhaust outlets are on the Starboard side, just aft of the sink drain. That stbd window does not open, and generally when anchored the breeze will keep the bow pointing into the wind which would carry the exhaust away to aft.

I would be careful to be sure there is clearance away from directly below the midship cleat to allow for using the furnace when at a dock without cooking your fenders.

Harvey
SleepyC Moon


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colbysmith



Joined: 02 Oct 2011
Posts: 4523
City/Region: Madison
State or Province: WI
C-Dory Year: 2009
C-Dory Model: 25 Cruiser
Vessel Name: C-Traveler
Photos: C-Traveler and Midnight-Flyer
PostPosted: Tue Mar 26, 2019 9:22 pm    Post subject: Reply with quote

What Harvey said. Smile At least that's pretty much where mine is. I have my Webasto mounted underneath the sink. My exhaust port is actually ahead of the sink drain. I've had no problems with exhaust coming back into the cabin with my helm seat window open, although I normally leave that one shut at night because of my exhaust's location. Colby
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pcg



Joined: 31 Aug 2018
Posts: 405
City/Region: Sherwood
State or Province: OR
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: C-Quest
Photos: pcg
PostPosted: Wed Mar 27, 2019 12:24 am    Post subject: Reply with quote

Thank you both. Very helpful!
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Sea Wolf



Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
PostPosted: Wed Mar 27, 2019 12:32 am    Post subject: Reply with quote

I know you said you didn't want comments about putting the exhaust stack on the rear of the roof, but, to me, at least, that's the most logical, safest place on the boat.

Would placing it there inside a second tube (double insulated) keep your inflatable (and anything else) protected from the heat?

At the same time, the carbon monoxide would be vented at the best possible point on the boat.

Could be a simple stainless or painted steel tube around the usual vertical self-drawing flue tube with the usual top fitting hidden inside.

e.g., put another tube around something like this:



Joe. Teeth Thumbs Up

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pcg



Joined: 31 Aug 2018
Posts: 405
City/Region: Sherwood
State or Province: OR
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: C-Quest
Photos: pcg
PostPosted: Wed Mar 27, 2019 10:08 am    Post subject: Reply with quote

Sea Wolf wrote:

Would placing it there inside a second tube (double insulated) keep your inflatable (and anything else) protected from the heat?

Possibly so. That's a good idea. Another reason I need to make a dinghy decision so I can get one and put it up there and ponder some things.

Thanks Joe.
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hardee



Joined: 30 Oct 2006
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City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
PostPosted: Wed Mar 27, 2019 12:35 pm    Post subject: Reply with quote

Another advantage of the roof stack is that you get the exhaust heat into the cabin for the length of the stack up to the cabin top.

Harvey
SleepyC Moon

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Sea Wolf



Joined: 01 Nov 2003
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C-Dory Model: 22 Cruiser
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PostPosted: Wed Mar 27, 2019 4:04 pm    Post subject: Reply with quote

hardee wrote:
Another advantage of the roof stack is that you get the exhaust heat into the cabin for the length of the stack up to the cabin top.

Harvey
SleepyC Moon



And, you can put a small blower facing the tube and maximize the heat exchange from the flue to the cabin air. I used two computer "muffin" fans.

The blower will not only give you more heat in the cabin, but also reduce your final exhaust temperature.

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Discovery



Joined: 08 Dec 2003
Posts: 1239
City/Region: LOA, UTAH
State or Province: UT
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: Discovery
Photos: Discovery
PostPosted: Wed Mar 27, 2019 9:57 pm    Post subject: Reply with quote

You don't say what type of forced air furnace? I put an Espar Airtronic D2 in 'Discovery'. It's under the galley cabinet, behind the sink. I also have a Wallas Stove. I exited the Espar exhaust through the starboard side above the walkway and just behind the Wallas exhaust. I don't have to worry about burning fenders as the exhausts are above the walkway and above where fenders are usually placed.


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pcg



Joined: 31 Aug 2018
Posts: 405
City/Region: Sherwood
State or Province: OR
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: C-Quest
Photos: pcg
PostPosted: Wed Mar 27, 2019 10:53 pm    Post subject: Reply with quote

Discovery wrote:
You don't say what type of forced air furnace?

I'm planning on using this propane furnace:
https://www.propexheatsource.com/heaters/hs2000-furnace/
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hardee



Joined: 30 Oct 2006
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City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
PostPosted: Fri Mar 29, 2019 1:02 pm    Post subject: Reply with quote

Propane has it's own set of conditions, tankage, storage, venting, servos, just seems like too much "stuff" for a C-Dory. you may hear other comments about it, but for me, I would not consider it on my boat.

Harvey
SleepyC Moon

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pcg



Joined: 31 Aug 2018
Posts: 405
City/Region: Sherwood
State or Province: OR
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: C-Quest
Photos: pcg
PostPosted: Fri Mar 29, 2019 1:37 pm    Post subject: Reply with quote

Thanks for all the suggestions re. where to locate the exhaust. I'm still holding out for some way to get it on the rear of the cabin roof.
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lloyds



Joined: 02 Aug 2005
Posts: 1724
City/Region: sublimity
State or Province: OR
C-Dory Year: 1996
C-Dory Model: 22 Cruiser
Vessel Name: undecided
Photos: 1996 22 Cruiser (Lloyds)
PostPosted: Fri Mar 29, 2019 4:02 pm    Post subject: Reply with quote

I put a wallas 1300 in the last C Dory 22 I had and went to quite a bit of trouble to make it unobtrusive and route power, fuel and air to best advantage. If I were to do it again I would go the simpler route and just set it on the counter in the starboard rear corner, pointed forward. That way exhaust just goes straight up through the roof, fuel sits on the rear of the shelf under the counter. Really simple, shouldn't take more than an hour so to install. And I think that would have given a better airflow to where you want it, toward the windshield and the v berth.
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thataway



Joined: 02 Nov 2003
Posts: 20779
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
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PostPosted: Sun Mar 31, 2019 9:42 pm    Post subject: Reply with quote

I agree that there are multiple reasons not to use a propane heater on the C Dory. Be use you know and follow the ABYC recommendations for storage and use of propane, the shut off, sniffers, hoses etc. It is far more complicated than a simple, diesel heater, which uses non explosive fuel. One of the biggest issues is to vent the propane locker overboard. It could be done with a fully sealed aft lazaretto, which. vented over the side at the bottom of the locker.

I used propane fuel for the stoves on our larger cruising motor sailors. But even there, there are many precautions to be taken. Once you have witnessed a propane explosion on a boat, it will leave a lasting impression! I have seen too many--and too many people injured or killed.

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Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
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ssobol



Joined: 27 Oct 2012
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City/Region: SW Michigan
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C-Dory Year: 2008
C-Dory Model: 22 Cruiser
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PostPosted: Mon Apr 01, 2019 10:49 am    Post subject: Reply with quote

thataway wrote:
... Once you have witnessed a propane explosion on a boat, it will leave a lasting impression! ...


I would say that probably applies to any explosion on a boat, not just propane.
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