supply of half face mask respirator of silicon medium with double ov-cartridge with retainer pre-filter for protectionhalf face mask respirator of silicon medium with double ov-cartridge with retainer pre-filter for protection,half face mask respirator of silicon medium with double ov-cartridge wi th retainer pre-filter for protection of wearer from inhalation of dust, paint fum es & aerosols and conforming to detailed technical specification as annexure-a [ w arranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]