Quote:
Originally Posted by Mr B
OK. To me it looked like the exhaust vent came down to the grill, not all the way down to the coals.
This might help in 2 ways. It will bring more smoke down to the grill or meat level before it can escape. Also it might let more heat escape directly up the exhaust vent alowing for even lower temps. Just my 
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In terms of height, top of the coals is about the same as the height of the grate.
And it would not allow more heat to escape out the stack as heat rises and you're taking your exhaust from a cooler area. But, due to smothering the fire, you would probably have lower temps overall.
Like OLS said, 4-5 inches off would be fine, if you need it.