Author Topic: How big aught the vent in a metal melting furnace be?  (Read 1589 times)

Offline S. Heslop

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How big aught the vent in a metal melting furnace be?
« on: August 20, 2013, 04:31:49 PM »

Here's where i'm at right now.

I read a thing online that said to give it 7x the cross sectional area of the burner tube, which worked out to about 60mm diameter with an inch wide burner. I've made a stack of MDF discs as the inner form, but I'm sort of feeling it looks a little bit small.



I suppose itd make more sense to over-shoot the ideal size since you can cover it partially with a fire brick, but i'd rather not make it too big.

Offline doubleboost

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Re: How big aught the vent in a metal melting furnace be?
« Reply #1 on: August 20, 2013, 05:17:01 PM »
Hi
Mine vents through a 80 mm pipe (side vent) as the furnace is inside
The hole in the top is 100 mm closed with a fire brick
John
4-CXw

Offline tom osselton

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Re: How big aught the vent in a metal melting furnace be?
« Reply #2 on: August 20, 2013, 07:40:33 PM »
Mine has a 4" vent hole too.

Offline S. Heslop

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Re: How big aught the vent in a metal melting furnace be?
« Reply #3 on: August 21, 2013, 07:06:58 AM »
I guess 100mm is the way to go then. Thanks for the replies.