I have a proposal to install the Navien NCB 180 in a crawl space. I have 48 inched to work with the unit is 28" high and I can make my own primary loop below giving me needed spec below. The 2" PVC vent is 2" using a street 90 to the outside might get me the clearance I need to install the unit. I will bring all my utilities on the newly wooden constructed wall on right side. I'll gladly accept any thoughts before I begin. My main question is space, do I have the space to install short of going to my supplier and laying out the unit from the box and measuring. Cheers.
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