Division 2 Fan energy efficiency requirements

United Kingdom

The minimum energy efficiency requirements for fans are set out in Tables 1 and 2.

Table 1

First tier minimum energy efficiency requirements for fans from 1 January 2013

Fan types	Measurement category(A-D)	Efficiency category(static or total)	Power range P in kW	Target energy efficiency	Efficiency grade(N)
Axial fan	A, C	static	0,125 ≤ P ≤ 10	η_target = 2,74 · ln(P) – 6,33 + N	36
	A, C	static	10 < P ≤ 500	η_target = 0,78 · ln(P) – 1,88 + N	36
	B, D	total	0,125 ≤ P ≤ 10	η_target = 2,74 · ln(P) – 6,33 + N	50
	B, D	total	10 < P ≤ 500	η_target = 0,78 · ln(P) – 1,88 + N	50
Centrifugal forward curved fan and centrifugal radial bladed fan	A, C	static	0,125 ≤ P ≤ 10	η_target = 2,74 · ln(P) – 6,33 + N	37
	A, C	static	10 < P ≤ 500	η_target = 0,78 · ln(P) – 1,88 + N	37
	B, D	total	0,125 ≤ P ≤ 10	η_target = 2,74 · ln(P) – 6,33 + N	42
	B, D	total	10 < P ≤ 500	η_target = 0,78 · ln(P) – 1,88 + N	42
Centrifugal backward curved fan without housing	A, C	static	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	58
Centrifugal backward curved fan without housing	A, C	static	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	58
Centrifugal backward curved fan with housing	A, C	static	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	58
	A, C	static	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	58
	B, D	total	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	61
	B, D	total	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	61
Mixed flow fan	A, C	static	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	47
	A, C	static	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	47
	B, D	total	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	58
	B, D	total	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	58
Cross flow fan	B, D	total	0,125 ≤ P ≤ 10	η_target = 1,14 · ln(P) – 2,6 + N	13
Cross flow fan	B, D	total	10 < P ≤ 500	η_target = N	13

Table 2

Second tier minimum energy efficiency requirements for fans from 1 January 2015

Fan types	Measurement category(A-D)	Efficiency category(static or total)	Power range P in kW	Target energy efficiency	Efficiency grade(N)
Axial fan	A, C	static	0,125 ≤ P ≤ 10	η_target = 2,74 · ln(P) – 6,33 + N	40
	A, C	static	10 < P ≤ 500	η_target = 0,78 · ln(P) – 1,88 + N	40
	B, D	total	0,125 ≤ P ≤ 10	η_target = 2,74 · ln(P) – 6,33 + N	58
	B, D	total	10 < P ≤ 500	η_target = 0,78 · ln(P) – 1,88 + N	58
Centrifugal forward curved fan and centrifugal radial bladed fan	A, C	static	0,125 ≤ P ≤ 10	η_target = 2,74 · ln(P) – 6,33 + N	44
	A, C	static	10 < P ≤ 500	η_target = 0,78 · ln(P) – 1,88 + N	44
	B, D	total	0,125 ≤ P ≤ 10	η_target = 2,74 · ln(P) – 6,33 + N	49
	B, D	total	10 < P ≤ 500	η_target = 0,78 · ln(P) – 1,88 + N	49
Centrifugal backward curved fan without housing	A, C	static	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	62
Centrifugal backward curved fan without housing	A, C	static	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	62
Centrifugal backward curved fan with housing	A, C	static	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	61
	A, C	static	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	61
	B, D	total	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	64
	B, D	total	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	64
Mixed flow fan	A, C	static	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	50
	A, C	static	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	50
	B, D	total	0,125 ≤ P ≤ 10	η_target = 4,56 · ln(P) – 10,5 + N	62
	B, D	total	10 < P ≤ 500	η_target = 1,1 · ln(P) – 2,6 + N	62
Cross flow fan	B, D	total	0,125 ≤ P ≤ 10	η_target = 1,14 · ln(P) – 2,6 + N	21
Cross flow fan	B, D	total	10 < P ≤ 500	η_target = N	21