The crawl space type is either a (1) normal vented crawl space (has a conditioned space above with raised floor insulation), (2) insulated with reduced ventilation (as used in the California Building Code), or (3) sealed and mechanically ventilated crawl space (also called a controlled ventilation crawl space or CVC).
The software user will model the crawl space as a separate unconditioned zone, selecting the appropriate crawl space type, with the perimeter of the crawl space (in linear feet) and the height of the crawl space.
The standard design has a typical vented crawl space when a crawl space is shown. Otherwise, the raised floor is assumed to be over exterior or unconditioned space.
The crawl space zone type and characteristics shall be reported on the CF1R. A controlled ventilation crawl space shall be reported as a special feature on the CF1R.