Chimney Temp for construction

[kriso]

Thinking about this, the funnel is the whole point to the chimney, to draw or funnel the smoke out.... What height would be the min for this to work???? And could this be made in galvanized steel or does it have to be stainless like the rest????? or maybe refractory cement???? Cheers

[GianniFocaccia]

More smoke out the door that chimney, why???

Consider the smoke exiting the oven that can't find it's way to the 8" diameter flue. It's gonna find the path of least resistance, out the front of your entryway. A flat arch like the one pictured allows a smoke path much wider than the flue pipe above it. The purpose of the funnel is to collect and direct the smoke upwards along a natural path before it can find the front of the oven and the fire builder.

[david s]

I think using a castable refractory is the easiest, but that's because I use the stuff a lot and have had lots of practice making moulds. If you make a mould from damp sand, you can simply plaster the castable over the mould about 3/4" to 1" thick, then remove the sand. It can be cast in situ. The castable should be wrapped in plastic (I use clingwrap) for 24 hours, you don't need an extended curing period with castable refractory. This stuff will take the heat and won't corrode like steel will.You can cast to whatever form you want to make. About 45 degrees is about optimum.

[brickie in oz]

Originally Posted by kriso

And could this be made in galvanized steel

Dont use gal, you will poison yourself with the fumes as it burns off.