Document ID: chunk:federal_register_of_legislation:F2015L01712:clause:7_6
Version: federal_register_of_legislation:F2015L01712
Segment Type: clause
Provision Reference: sch 7 cl 6
Character Range: 14840–17044

6  Definitions for eligible fan types (other than cross‑flow fan)
 (1) For this determination, a reference to a fan of an eligible fan type listed in the following table is a reference to a fan that has:
 (a) a fan flow angle (); and
 (b) where specified, a fan blade angle ();
  within the range specified in the table.

Fan flow angle and fan blade angle for eligible fan types
Eligible fan type                                          Fan flow angle ()  Fan blade angle ()
axial‑flow fan                                                                                     ≤ 20  (not specified)
mixed‑flow fan                                             20 <                                   < 70  (not specified)
centrifugal backward‑curved fan                            70 ≤                                                             ≤ - 1
centrifugal radial bladed fan                              70 ≤                                          -1 <              < 1
centrifugal forward‑curved fan                             70 ≤                                          1 ≤             

 (2) For this section:
 (a) the fan flow angle () is the angle between:
 (i) the centre‑line of the air‑conducting surface of a fan blade, measured at the midpoint of its trailing edge; and
 (ii) the centre‑line of the rotation axis of the fan;
  in a plane through the rotation axis and the midpoint of the trailing edge (illustrated in Figure 1); and
 (b) the fan blade angle () is the angle between:
 (i) the tangent of the air‑conducting surface of the blade; and
 (ii) the radial through the rotation axis of the fan;
  at the midpoint of the blade's trailing edge, in a plane perpendicular to the fan rotation axis, and which is positive when the blade is inclined in the direction of the rotation of the impeller (illustrated in Figure 2).
Figure 1—Fan flow angles for eligible fan types

Note: Figure 1 and Figure 2 are sourced from Ecodesign Fan Review – Review Study of Commission Regulation (EU) No 327/2011 – Final report, prepared by Van Holsteijn en Kemna B.V. for the European Commission, Directorate‑General for Energy, which was accessed from http://fanreview.eu.