Kit of must change filter, suitable for use in conventional & garib rath rmpu ac coaches, confirming to rdso specification no. rdso/pe/spec/ac/0055-2003(rev.2)-2014 and kit of filters confirming to rdso drawing no. rdso/pe/sk/ac/0057-2003 (rev.2) sheet 1 of 2. the each kit of filter consist of (i) fresh air filter size -260 +/- 2 x 230 +/- 2 x 60 +/- 2 mm = 04 nos. (ii) return air filters size- (a) 620 +/- 2 x 460 +/- 2 x 50 +/- 2 mm = 01 no. (b) 550 +/- 2 x 500 +/- 2 x 50 +/- 2 mm = 03 nos.