I can assure the minister
there is something wrong with the system in the building as a whole. I know that in some of the lavatories upstairs more than half the time the air, instead of being drawn from the lavatory through the ventilator, comes through the ventilator into the lavatory. There is obviously something wrong with a system when it works backwards in that way. The sergeant-at-arms is acquainted with the situation and on many occasions he has sent someone to correct it. I do not know how it is done. It will work all right for a day or a day and a half, but the next time you go back you find the current of air reversed in the manner I have indicated.