This framework contract covers the services of maintenance and calibration of equipment and facilities of the VELA MaSu Air conditioning and sampling system to ensure their proper operation. Specific provisions for instruments calibration to meet the ISO 17025 requirements are needed to maintain the accreditation of our laboratories in order to fulfil the legal obligations laid down in Reg. 2018/858 and 2018/1832. The procurement, covers LOT 3 from previous procedure EC-JRC/IPR/2025/OP/2447 - FWC for VELA Maintenance 2026-2030 which was unsuccessful since only one irregular tender was submitted in response to the open procedure for LOT 3.