MadModder

The Shop => Metal Stuff => Topic started by: S. Heslop on August 20, 2013, 04:31:49 PM

Title: How big aught the vent in a metal melting furnace be?
Post by: S. Heslop on August 20, 2013, 04:31:49 PM
(http://iforce.co.nz/i/v04jtbwb.e04.jpg)
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.

(http://iforce.co.nz/i/0fo22en2.qj3.jpg)

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.
Title: Re: How big aught the vent in a metal melting furnace be?
Post by: doubleboost 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
Title: Re: How big aught the vent in a metal melting furnace be?
Post by: tom osselton on August 20, 2013, 07:40:33 PM
Mine has a 4" vent hole too.
Title: Re: How big aught the vent in a metal melting furnace be?
Post by: S. Heslop on August 21, 2013, 07:06:58 AM
I guess 100mm is the way to go then. Thanks for the replies.