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Division 1.1.2 The above-mentioned air velocity shall be determined as an averaged value of a number of measuring points that:

Original text. Later amendments are not shown.

  1. (a)

    For fans with rectangular outlets, are located at the centre of each rectangle dividing the whole of the fan outlet into 9 areas (dividing both horizontal and vertical sides of the fan outlet into 3 equal parts). The centre area shall not be measured (as shown in Figure A5/1);

    Figure A5/1

    Fan with rectangular outlet

  2. (b)

    For fans with circular outlets, the outlet shall be divided into 8 equal sectors by vertical, horizontal and 45° lines. The measurement points shall lie on the radial centre line of each sector (22,5°) at two–thirds of the outlet radius (as shown in Figure A5/2).

    Figure A5/2

    Fan with circular outlet

These measurements shall be made with no vehicle or other obstruction in front of the fan. The device used to measure the linear velocity of the air shall be located between 0 and 20 cm from the air outlet.