closed, only auxiliary electric exhaust valve open to atmosphere. Installed manometer connection in steel plate covering opening on west side of entrance, connected manometer to determine pressure inside of plant. 1030 Closed stack exhaust, and opened auxiliary exhaust on all three units, closed large entrance door and personnel door, auxiliary exhaust valve open. 3. Manometer reading with power house closed as above .204.25 = .45 inches of water, or .0162 lbs. per sq. in, pressure. 2045 5. Pushed button to close auxiliary exhaust valve. 1045:30 Auxiliary exhaust valve closed. 6. 1045:46 Power house units stopped in 16 seconds. 7. Manometer reading taken at 1045:46 as power house units shut off = 1,041.0 = 2.0 inches of water, or .0722 lbs. per sq. in. which is equal to 10.39 lbs. per aq. ft. pressure in power house. 5-322