tender for dry type return air filter for conventional rmpu type ac coaches of size-(550 x 500 x 50) mm asper rdsos drg. no. rdso/pe/sk/ac/0057-2003 (rev. 2) (sheet 1 of 2 ) and conforming to rdsosspecification no. rdso/pe/spec/ac/0055-2003 (rev- 2).
