Patent ID: 7789740

Claim:
A crawlspace encapsulation system for encapsulating a crawlspace of a building, the system comprising: a substantially impermeable barrier layer disposed in the crawlspace and isolating at least a portion of the crawlspace from an outside atmosphere forming an encapsulated crawlspace substantially sealed from vapors outside the building, the substantially impermeable barrier layer being sealed contiguous to the top edge of a building foundation wall by a continuous peripheral sealing bead; and an air circulation system including a fan unit located in the encapsulated crawlspace, a single air outlet disposed in a bottom surface of the fan unit that directs air downwardly towards a floor of the crawlspace, and only one air inlet opening, the air inlet opening located on a floor separating a habitable area of the building from the crawlspace, wherein air from the habitable area of the building is drawn by the fan unit into the air inlet opening; and wherein, the air circulation system mixes air from the habitable area of the building with crawlspace air substantially throughout the encapsulated crawlspace so that mixed air is substantially distributed throughout the encapsulated crawlspace, and wherein the air circulation system pressurizes the encapsulated crawlspace relative to the outside atmosphere.