pedestal fans, table fans, wall fans, louvre fans, tower fans, bladeless fans

3.3tower fancomfort fan for use on the floor having a vertically elongated design of the cross-flow type,tangential type, centrifugal type or impeller type with a free inlet and outlet of air

3.4bladeless fan  comfort fan with concealed impeller to pressurize and eject air flow from non-free airducting outlet 

3.5ceiling fanconventional fan provided with a device for suspension from the ceiling of a room so that theblades rotate in a horizontal plane with the diameter of the blade not larger than 1 800 mm

3.6table fan  conventional  fan intended for use on a tableNote 1 to entry: Table fans have a maximum adjustable or non-adjustable height of less than 1 200 mm.

3.7pedestal fan  conventional  fan mounted on a pedestal of fixed or variable heightNote 1 to entry: Pedestal fans have a minimum adjustable height or non-adjustable height equal to or greaterthan 1 200 mm.

3.8wall bracket fancomfort fan for mounting on the wall

3.9ceiling bracket fancomfort fan for mounting on the ceiling

3.10louvre fancomfort fan having moving louvre which provides a continuously changing multi-directional airflow

The fan shall be placed at such a height that the plane of the fan blades is 3 000 mm ± 10 mmfrom the ground level and lies in the plane of the top edge of the clapboard containing the topopening in the roof of the test chamber.

5.2.1.2 Measuring instrumentThe air movement shall be measured by means of vane anemometers having an internaldiameter not exceeding 100 mm.

5.2.1.3 Arrangement of apparatusThe plane of the fan blades lies in the plane of the top edge of the clapboard containing thetop opening in the roof of the test chamber. A flat plate is installed above the ceiling fan, the size of which shall be between 1,1 and 1,2times the blade diameter. The distance between the plate and the plane of the fan blades isdetermined by the distance between the plane of the fan blades and the ceiling after theceiling fan has been installed in accordance with the instructions for use. The plane of the anemometer's vane is parallel to the plane of the fan blades. Theanemometers shall be moved in either direction along both diagonals of the test chamber in atest plane 1 500 mm ± 10 mm below the plane of the fan blades. The anemometers shall besupported in such a manner as to cause as little obstruction as possible to the air flow

5.2.1.4 Procedure for testThe measurements shall be carried out with the fan running at full speed at the test voltage.  For the air velocity other than the origin point at axis of the fan blade (3 in Figure 2),the measurements in each of four directions shall commence at a point 40 mm from theaxis of the fan blades and shall progress horizontally to the fan blade axis in incrementsof 80 mm along the semi-diagonals of the test chamber (3 to A, 3 to B, 3 to AA and 3 to BB inFigure 2). The measurements shall be continued in the 80 mm increments until the air velocityin each of the four directions falls below 9 m/min.

For the air velocity of the origin point at the axis of the fan blade with a radius of 40 mm, themeasurement shall be carried out by one anemometer positioned on the origin point at theaxis of the fan blade

. The air velocity shall be averaged over a period of 60 s using an update rate of not lessthan 2 Hz.

The average air velocity through each annulus is taken as the mean of the 8 air velocitiesobtained at each anemometer position on the inner and outer radii of the annulus. The meanradius of each annulus is equal to the mean of the inner and outer radii of the annulus. Average air velocities below 9 m/min are discarded.

5.2.1.5 Calculation of flow rateFor each annulus having an average air velocity equal to or greater than 9 m/min, the productof the area of the annulus and the average air velocity through that annulus,

shall be taken asthe air delivery through that annulus.  For the circle around the original point at the axis of the fan blade with a radius of40 mm, if the air velocity is equal to or greater than 9 m/min, the product of the circle areaand the air velocity through the circle shall be taken as the air delivery through thecircle. If the air velocity is less than 9 m/min, the air delivery through the circle is ignored.

The sum of the air deliveries through  the circle  and all such annuli shall be takenas the measured flow rate of the fan for the purposes of this document. No correction is made for relative humidity or air pressure.

5.2 Testing of air performance

5.2.1 Ceiling fans

5.2.1.1 Test chamberThe fan shall be tested in a test chamber having the following dimensions: length 4 500 mm,width 4 500 mm, height 3 000 mm (see Figure 1 and Figure 2).

The above dimensions shall have a tolerance of ± 15 mm

The top of the test chamber shall be covered by the clapboard, except for a centrally situatedcircular opening (top-opening), the diameter (D) of the top opening shall be between1,1 and 1,2 times the blade's sweep. The top clapboard in which the top opening is locatedshall be not more than 6 mm thick. The bottom of the test chamber is 450 mm from the ground,to leave a suitable space for air outlet.

Readings shall be taken from a position between the chamber and the outer screen, and asmall shelf for electrical instruments may be provided in this space. Except for these, thespace between the test chamber and the outer screen and the space inside the test chambershall be clear of all obstructions, and any conditioning apparatus (including heating or cooling)shall have no influence on the movement of air in the test room while the test is in progress.

 The room in which the test chamber and the outer screen are erected shall beprotected against extraneous draughts.

 Any ceiling external to the test chamber or any projecting beam which might interfere with theair flow shall be not less than 1 000 mm above the top opening, i.e. not less than 4 000 mmfrom the ground level at this point.

The distances between the walls of the chamber and the walls of the outer screenshall be 1 000 mm to 1 250 mm