3 inch flue through my 4 inch solar fan vent hole..

[groundhog]

So..... I sent money for a Tiny Tot coal stove for my boat.
They are only 6 inches in diameter, with a 3 inch flue comming off the top.

My plan is to only have this thing installed during winter, with my normal Nicro solar fan installed in the hole in summer.

I need to make an adaptor for the hole. that steps down from 4 to 3 inches and insures that no plastic will melt, or no boat hatch catches on fiwer.

Any ideas?

Im imagining big metal stuff to move off heat....
OR.... non metal stuff to insulate...

Whats that stuff in home depot that you put inder tile floors? Cement board?
Can I make something from that?

THanks,
groundhog

[MarkSF]

You want to insulate, not move off heat.

Stainless steel is a poor conductor of heat and you could make it worse by putting a non-conductive gasket between it and the flue. You can also make it conduct badly by machining a groove in it that makes it very thin for a part of it's cross section. A technique used often in high-vacuum systems that have to be baked out.

[deniseO30]

There's a good chance the vent termination fitting and flange provided by the mfg, will actually work in the 4" hole.

[neverknow]

Take a look at the double wall pipe used on gas heaters. Most newer higher efficiency gas heaters use a small 3 or 4 inch double wall pipe. You could use that and some stainless around it. Use high temp RTV to seal around/between the pipe and the stainless.

You should be able to find the pipe at any place like Lowes or Home Depot etc.

[CrazyRu]

I have Tiny Tot stove in my boat.
I used Dickinson Deck fitting and H-cap for a deck.
http://www.dickinsonmarine.com/parts.php
I used double wall 3 inch pipe from tractor supply, it is about 1/2 of a price of dickinson pipe.
PelletVent® Multifuel Straight Pipe, 36 in. L - 3102518 | Tractor Supply Company
PelletVent® Multifuel Straight Pipe, 12 in. L - 3102500 | Tractor Supply Company
I used one 36 inch section, as double wall section, and two 12 inch sections. I stripped outer skin off of short sections for better heat transfer. Inner tube, core is stainless steel, outer is galvanised steel.