Ventilation: Three shafts supply air to the underground, which is divided into four separate ventilation circuits. Each of the circuits is controlled by a regulator (a set of louvers). One common exhaust shaft (ES) vents all used underground air back to the surface.
Most of the fresh air that enters the underground flows down the air intake shaft (AIS). Once this air reaches the E-0 drift, it splits going north and south.
The air going south picks up additional intake air coming down the salt shaft and continues south through the W-30 drift. At the S-1000 crosscut, this airflow is divided. One portion is directed east to ventilate the waste disposal area. The remainder ventilates the mining area. Disposal area exhaust air is routed through the E-300 drift to the ES, while mining area exhaust air may be routed to the ES through either the E-300 or W-170 drift, depending on operations needs.
The air going north ventilates the experimental gallery and storage and shop areas.
Air entering the waste shaft (WS) is used to ventilate only the WS itself and the adjacent WS station and flows from there directly to the ES.