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Forge Ventilation help? Answered



Hi all,

Due to location & noise, in order to continue using my coke forge and anvil I must move indoors, into the shed to be precise.

I know it sounds a bit crazy attempting to run a coke forge in quite a confined (10-14 m3), fairly air tight space, but I have researched thoroughly the dangers and safe working levels etc and have the use of a fully calibrated gas analyser designed to measure CO in real time, so safe operation will be measured to the nearest ppm :) 

The fans gumf claims 1060 m3/hr which I guess is best case, flat out @ 50hz and obviously does not allow for any other mechanical losses, but even a conservative estimate must give around 45 air changes an hour, which to me sounds like more than adequate clean air coming in to displace combustion gasses.

But I guess the first question is will the chimney work as a passive exhaust,  to maintain positive pressure behind the chimney (which will be 12") I will have only a forced air inlet and no other vents other than the chimney itself, trouble is I can see it both working and not working:

1. Inside air will be forced up the chimney as that is the only way out = more ventilation

2.Inside air will cool the air in the chimney reducing the natural draw =  less ventilation

And even if the CO issue is overcome will heat just ruin my plans anyway?

4 Replies

user
Squibo (author)2017-01-07

Thanks for the replies gents, I apreciate your help.

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rickharris (author)2017-01-07

Shed suggests wood. Wood and a forge seem to be mutually exclusive! Hope your fire extingusher is a good one.

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Toga_Dan (author)2017-01-07

I would try it. Set up the CO meter, fire up the forge, step outside, and close the door.

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Downunder35m (author)2017-01-06

Would not try it in such a confined space.
Too much heat, too much you can't control , like flying ambers to name just one.
And with the chimney as the only exit all air will be drawn towards your work area causing a massive draft - a thing you don't really want when forging....

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