In the installation manual (last paragraph pg 8), they talk about a vacuum relief duct. The way I understand it is that the intake (outdoor portion) is to be 3' above ground then rise within the insulation 4' and then terminate (with or without a screen). I am at a loss as to what this thing does? Since the blower has it's own intake, what is the purpose of this ductwork? In diagram A.1, the unit is located on the north wall beside the GARN. Does it have to be? Can it be located on any wall (I assume it can)? Can it be located in front of the GARN in the loading area? (This would not be within the insulated area but would be a lot easier in my case. This goes back to understanding why the thing is necessary in the first place).
I was going to have access to the top through one of the gable ends. This enables me to close and easily insulate above the work area with no access hatch necessary through the insulation. I guess I am not understanding the real purpose of this vent. Why would it show being above the unit if the air is going to be drawn from the work area when the door is opened? Why not just have a vent going through the wall in the work area? Why does it open 4' above the entry point? Lots of questions.
I was going to have access to the top through one of the gable ends. This enables me to close and easily insulate above the work area with no access hatch necessary through the insulation. I guess I am not understanding the real purpose of this vent. Why would it show being above the unit if the air is going to be drawn from the work area when the door is opened? Why not just have a vent going through the wall in the work area? Why does it open 4' above the entry point? Lots of questions.