Venting fumes

Well, I don't know much about hvac, but anything that combines combustible fumes and heating elements would worry me?

Another item to consider is making sure that your fumes actually go outside rather than circulate amongst you hvac ducting, particularly if your airbrushing when the hvac isn't going.  Perhaps if I was actually looking at your setup, I might think that it is an obvious solution, but off the top of my head, adding a second outlet seems the better alternative.

Well, return air does return air to the furnace, which will probably be a bad idea. Diverting air from the return takes away from the furnace, which may be a bad idea.

Is there a window in the utility room you can vent the fume through? I used a piece of MDF board and mounted a dryer vent flapper valve to it and placed that inside the window frame with the window opened only enough for the vent itself. I can safely vent the fumes outside, and it's airtight enough that I can't feel a draft even during those cold Canadian nights.

WHOA Hud... hang on there bud, don't go venting combustible hobby fumes into your heating & AC ventilation system, I'm assuming that you're talking about enamels here.

HVAC systems don't really exhaust to the outside, they re-circulate the same air with "some" new outside air added. So your fumes will be traveling throughout the house, if it makes it safely past the furnace.

If you don't have a window that you can use to vent through, and I can understand not wanting to bore a hole through your foundation, what about going through the header above the foundation? You can then use a dryer vent from outside of the house.

Thanks guys for raising the red flag!  Your comments are well taken and make good sense. One, I didn't think about the fumes going back the other way when the furnace wasn't running (least not until about four this morning when I woke up thinking about this). Second, I'm not an hvac man so I wasn't aware that the return air is used in recirculation. Third, The closest window is twenty feet away and is of the crank out type. Too far to vent I would assume. I think my best alternative is to poke a hole and vent it outside via dryer hose/vent. Thanks again for the input. You probably saved my butt :)

Hud

Glad too help keep your butt in the hobby Hud. 

Done deal!  I couldn't stand it no more. I got out the chisels and hammers, went to the local hardware store and bought what I needed for venting to the outside. Everything turned out great, works like it supposed to and it looks just fine, like it was there all along. Thanks again.

Hud