Furnace exhaust chimney position

ianybw

ianybw

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Hi,

I am about to drill a large 3 inch hole in my deck above the bulkhead to fit a Dickinson P12000 propane heater.............er?

Is there a minimum distance that the chimney must be to other deck openings? Its one of these double-skinned chimneys, the inside pipe is the exhaust, the outer skin is the intake. Its a closed system.

I have a round vent expelling air from the forward head compartment within 12 inches of my planned chimney position and was planning another opening vent there also at a later date.

Anyway, any advice welcome, thought it best to ask before I got busy with the hole saw.

Many Thanks
 
G'day Sylvesterthecat,

I doubt the exhaust being close to another vent will be problem as far as heat is concerned as both will pushing air out and away from the deck.

However, I would have a long look at what effect a couple of cut outs would have if located close to a bulkhead and each other, with plans to add another hole.

Cutting a hole next to bulkhead high stress area may lead to cracks in the gelcoat or in the structural glass. Another close by will only weaken the area between the two openings.

You can strengthen the deck from inside to avoid spoiling the deck finish, just ensure the opening leaves enough gap to hold a suitable sealant.

You should also coat the edges of the openings with an epoxy resin to protect the exposed glass fibres to avoid moisture entry, I assume this is a glass only deck and not a foam core, because if it's cored some of the foam will have to be removed and back filled with epoxy and filler; closed cell balloons if no load and micro fibres if any load is expected like through bolting.

I hope this helps.

Avagoodchrissie......
 
The most important thing to consider is flue gas/carbon monoxide being drawn into the confines of the boat through any opening/vent. In a confined space carbon monoxide can kill in in a very short space of time. I would speak to the manufacturer and take his advice
 
Is there any chance that the products of combustion could re-enter the boat through this other vent ?

<span style="color:red"> With domestic installations </span> the manufacturers issue strict instructions as to the required clearances in relation to openings into the structure and even obstructions (drain pipes,internal and external corners ect) near the flue terminal and these can vary between different manufacturers and boilers.
pete
 
The manufacturer states that there should be no chance of the fumes reentering the boat through any other openings. Well that isnt too helpful, depends on which way the winds blowing, then again I suppose they are just covering themselves legally.

The question is whats reasonable? 20 inches is stated for separation from a fuel inlet, but I have seen many with a lot less than that.

The comments about not weakening the structure are valid and I will make sure I don't do that.

I think I will just put the hole on the opposite side of the yacht from the vents in question, that way its as far from anything as I can make it.

We never sleep with a heater on anyway, but somebody might.

Don't want to wake up dead do I.

Thanks for the input.
 
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