An apparatus captures and evacuates air from an area above a body of liquid, particularly a swimming pool. The apparatus exhausts the contaminants and water vapor to an area outside of an enclosure housing the swimming pool. A perimeter deck drain assembly extends around the pool and is connected to at least one conduit for collecting and draining deck water, at least one tray for directing the water in the conduit to a drain, a grating system for receiving water from the pool deck, at least one exhaust conduit, and at least one exhaust apparatus for directing the contaminants and water vapor to a desired area. The evacuation apparatus may be in the form of a bench positioned on a floor or deck surrounding a pool. The invention also provides an associated method for evacuating contaminants.