I " found " some time today to work on the river boat.
Not a lot to show , but its all progress I guess.
To install the wood burner stove , I need to insulate the 100 mm ( four inch ) flue from the surrounding combustible ceiling panels and roof framing.
As I am waiting for the stainless flue order to arrive , in the mean time , this is a start at making the drop box that will penetrate the ceiling and hopefully prevent the house from burning down.
This is the first skin liner that will surround the flue as it passes through the ceiling.
It is recycled sheet metal from an old washing machine casing.Its nice thick sheet metal that can take some hammering .
The bends and folds were just shaped over some scrap 50 mm steel angle , and the two halves riveted together with pop rivets and sealer.
There is another second skin that is spaced about 25mm away from the inner liner .
The four inch flue will be placed inside these.
I fashioned a cone shaped piece that fits over the outer shield ( left ).
Holes will be cut or drilled along the very top edge to allow the hot air to vent out.
The piece on the right is where the flue will exit in the centre.
The narrow skirt that can be seen around the outside is a shield to prevent rain water from entering the vent holes.
I will cut and seal the circular hole for a watertight fit when I have the flue.
Next is making the ceiling plate and witches or chinaman`s hat ( cowl ).
Circular galv. sheet is formed into a cone.
The cowl surround is a recycled aluminium cooking pot that was just the correct diameter.
I cut the bottom out with a four inch cutting disc.
The cowl will look something like this.
These are ADD or Anti Down Draft cowls , they are really simple in design , but they do work well.
The wind / air moves over the circular cowling which creates a slight pressure difference inside ( low pressure ) which causes additional draft to clear any hot exhausts or smoke away.
There are more small items to add to get the thing assembled , but this gives an idea of what this will look like.
The ceiling plate was fashioned from a recycled stainless steel BBQ drip tray.
To reduce buckling the edge of the flue hole was reinforced with a piece of split ( slotted ) 3/8 inch copper pipe.
Thanks for looking.
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