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Old 2018-08-26, 6:09pm
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Speedslug Speedslug is offline
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Join Date: Mar 21, 2009
Location: Winnebago, MN
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Air will mix in with the fumes from the torch really quickly and reduce the temperature so that won't be an issue at all.

I do have a problem with how much air that particular fan moves.

Most makers of fans drastically over state how much air they move by manipulating the figures from their own testing so you can probably cut that 750 cfm in half to get what you are really going to get from that fan.

And even if those number were true 750 cfm is just not fast enough to move the heavy metals involved with coloring glass out of the duct work to mix with the outside air.

You really don't want a fan that only moves fumes barely fast enough to just dump those chemicals on the outside of your house.
You want the fumes to flow out fast enough to disperse into the air and get spread out enough in the atmosphere to be of little consequence.


A funnel vent system should move at least 1000 cfm and in order to get one that truly moves that much air you should shop for 1200 or 1500 cfm.

Keep in mind that the longer the length of the duct work the faster you want to move the flow through it so that it still has sufficient velocity to mix well with the air outside once it gets there.



Oh and those expandable duct work things have such a rough inside surface that they are the equivalent to half there stated size so an 8 inch diameter flexible duct is only going to move as much air as a 4 inch smooth sided duct.
It makes a huge difference in how effective they are in moving high quantities of air.
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Last edited by Speedslug; 2018-08-26 at 6:16pm.
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