This vents spent salt spray from inside the chamber to atmosphere. The chamber should therefore ideally be located adjacent to an outside wall, and a hole made through the wall to accommodate the exhaust pipe. The end of this pipe should be directed away from persons and property, and be shielded from wind to prevent any disturbance to the conditions inside the chamber. If access to an outside wall is not possible or inconvenient, Ascott offer an optional accessory called an Exhaust Salt Scrubber Unit (ref; ACC92). This comprises of a free standing enclosure, which should be located near to the chamber, and connected to the chamber exhaust vent outlet, a floor level drain and a continuous pressurised mains water supply. The unit works by directing the chamber exhaust towards its internal base, where a significant surface area of relatively cool liquid condensate/water is retained. The relatively warm salt laden exhaust passes over this and is simultaneously sprayed with a fine mist of cool water from a mains water sprayer located in the top of the unit. The combined effect of this is to condense and wash out the salt water droplets present in the exhaust, so that they combine with the retained liquid in the base of the unit. Surplus liquid is drained to waste from the base of the unit and the remaining 'scrubbed' compressed air from the chamber exhaust is allowed to vent from a port in the top of the unit. ACC92 is not suitable for chambers fitted with the SO2 gas dosing optional accessory (ref; ACC46) due to the toxic nature of the SO2 which may exist in the exhaust.