Originally Posted by going4speed
My understanding based on recent training and international building code is any penetration (vent or other) into a garage as being against code. The vent could allow fumes from the garage to travel into the living space. Also if you had gas fumes from a leaky gas tank or other gas leak/chemical leak then these fumes can get back to the heater and cause an explosion or fume entry into the living space. I believe this would fall under home owner construction and I cant imagine a hvac contractor willingly installing a vent from the living space ac into a garage. Opening an entry door into a house can cause a vacuum to draw the fumes into the house vent regardless of a return vent or not. YMMV. The vent would also comprise a break in the fire barrier. not good.
This should be about airplanes .... just sayin'
Is about airplanes ! He's trying to cool off his garage to work on them
In the heat of summer I try to bring them in the house as much as possible., 76° commared to 104°, much better for repair and maintenance.