My shop is a third bay addition to an attached two car garage. There is a 7' wide by 8 1/2' tall opening between the double bay and the shop where I want to put doors.
There is a Reznore NG heater in the double bay that does a very good job of heating all three bays. I have some electric radiant cove heaters to provide supplemental heat to the shop once doors are installed.
I'm going to exhaust at least dust outdoors and will likely have a cyclone in a shed just outside the shop so I need to be worried about makeup air, pulling carbon monoxide from the NG heater, etc.
I also need to be able to roll my table saw from the shop to the garage and also need to occasionally be able to drive an ATV with a plow between the shop and the garage.
My first choice was to use one of those cheap accordian doors without the bottom track but I'm concerned that I'll be pulling too much make up air from the garage. The accordian doors gives me more height and closes up and out of the way nicely.
So I guess the most important question I have is how tight of a seal do I need between the shop and the NG heated garage if I'm going to exhaust my DC outdoors? To me being able to move tools, ATVs and door height are less important issues that can be dealt with later.
On Bill Pentz's site he writes "Finally, Unless we provide a way for makeup air to enter our shop, blowing the air outside can suck deadly carbon monoxide backward through our vents. Most need to just open a door or window and they the risks of pulling the carbon monoxide out of our fired appliances vanishes." http://billpentz.com/woodworking/cyc...austingOutside
I'm not sure what to make of this. Does this mean I need as much or more area for return air on the shop side as would be found around the entire door to the shop?
Thanks for any input.