One thing to consider is your HVAC may be doing you in...... HVAC does not supply fresh air (well maybe 5 to 10%) it mostly recycles room/house air. If your HVAC is negating the "serious air" you vent fan pulls, you are not getting fresh air flow needed to be safe...
Eliminate the ac into room while torching, setup room/studio in "concept" of sealed space and control fresh air entering through direct access from outside and be sure you exhausted air is at least 10 feet away for fresh air intake....
AC for most part is not your friend when doing studio ventilation....
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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