I've always heard that indoor grilling needs to have a downdraft vent; is there a particular reason why? Jenn Air has pretty much dominated the market for indoor grill options and all their cook tops have downdraft vents.

Mine doesn't seem to suck out the steam down that great. For all I know it's getting the dangerous stuff but visually it looks like 20% is going into the air. It doesn't smoke me out, but it does set off the smoke alarm every so often just like if you burn something on the stove. I'm going to have a pro check the vent, but if any of you have thoughts on downdraft in general I'd be interested.

I'm also surprised that with Jenn Air being around for 30+ years with their indoor grill tops there's not a lot of reviews or discussion about them.