§ Mr. Norman Atkinson
asked the Lord Privy Seal if he will issue a general instruction to end the present practice of re-cycling 50 per cent. extracted polluted air through the air conditioning system supplying the Upper Committee Floor (South) windowless offices; and if he will arrange to have the stagnant humidity wells within the ducting drained of their water.
§ Mr. Biffen
I am informed that the roof-lit offices on the Upper Committee Floor (South) are ventilated with a mixture of 75 per cent. fresh air and 25 per cent. recirculated air. Air is recirculated as an energy conservation measure. The amount recirculated is calculated on the volume of fresh air needed for the various room sizes and the numbers of occupants, which is in accordance with the health and safety regulations.
All supply air is filtered and the relative humidity is controlled by means of steam jets. The humidity wells which once formed part of the system are no longer used and have had permanent drains installed to ensure that stagnant water does not accumulate within them.