[A930Rocket]

Having built hundreds of homes, the HVAC system has to have room under there and I always make sure the crawl space is high enough to work in. One corner may get short, but no closer than 18". At 6' 4", I got tired of working in others mistakes.

Once, the mason forgot to install the crawl door space in a foundation. Before the mason could fix it, we went ahead and framed it. When it came time to do the frame walk, I had to crawl in and out of a vent (8"x16"). I don't think I could get my head in there now...