Directive 70/156/EEC is amended as follows:

1. 1.

   In Annex IV, part I, a new item numbered 61, and footnote, is inserted as follows:

   Subject	Directive No	Official Journal reference	Applicability
   			M1	M2	M3	N1	N2	N3	O1	O2	O3	O4
   ‘61. Air-conditioning system	(2006/40/EC)	L 161, 14.6.2006, p. 12	X			X14
   Only for vehicles of category N1, class I as described in the first table in point 5.3.1.4 of Annex I to Directive 70/220/EEC as inserted by Directive 98/69/EC.’

2. 2.

   Annex XI is amended as follows:

   1. (a)

      in Appendix 1 a new item numbered 61 is inserted as follows:

      Item	Subject	Directive No	M1 ≤ 2 500 (1) kg	M1 > 2 500 (1) kg	M2	M3
      ‘61	Air-conditioning system	2006/40/EC	X	X’

   2. (b)

      in Appendix 2 a new item numbered 61 is inserted as follows:

      Item	Subject	Directive No	M1	M2	M3	N1	N2	N3	O1	O2	O3	O4
      ‘61	Air-conditioning system	2006/40/EC	X			W’

   3. (c)

      in Appendix 3 a new item numbered 61 is inserted as follows:

      Item	Subject	Directive No	M2	M3	N1	N2	N3	O1	O2	O3	O4
      ‘61	Air-conditioning system	2006/40/EC			W’

   4. (d)

      in ‘Meaning of letters’ the following letter is added:

      W

      Only for vehicles of category N₁, class I as described in the first table in point 5.3.1.4. of Annex I to Directive 70/220/EEC as inserted by Directive 98/69/EC.

The total GWP for a preparation is a weighted average, derived from the sum of the weight fractions of the individual substances multiplied by their GWPs.

Σ (Substance X % × GWP) + (Substance Y % × GWP) + … (Substance N % × GWP)

where % is the contribution by weight with a weight tolerance of +/- 1 %.

For example: applying the formula to a theoretical blend of gases consisting of 23 % HFC-32; 25 % HFC-125 and 52 % HFC-134a;

Σ (23 % × 550) + (25 % × 3 400) + (52 % × 1 300)

→ Total GWP = 1 652,5.