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SUPPLY INSTALLATION TESTING COMMISSIONING OF FREE COOLING SYSTEM POWERED WITH 230 V AXIAL FLOW FANS OF AIR DELIVERING CAPACITY OF 1200 ± 00 CFM AT INLET AND 1200 CFM ± 200 CFM AT OUTLET I/C S/F SUITABLE INVERTER FOR THE ABOVE SYSTEM FOR THE BACKUP VOLTAGE OF 48 V D.C AS PER THE DETAILED SPECIFICATION. THE FANS SHOULD BE MOUNTED IN A RAINPROOF HOUSING OF G.I SHEET NOT LESS THAN 18 SWG SUITABLY BEND DOWNWARDS I/C PAINTING , S/F FILTERS, GRAVITY BASED DAMPERS IN THE OUTLET, WARM PROTECTION NET, I/C MAKING OPENING IN THE BTS SHELTER, MAKING GOOD THE DAMAGES MADE, S/F MICRO PROCESSED BASED CONTROLLER SUITABLE FOR THEFREE COOLING SYSTEM WITH AUTO / MANUAL CONTROLS, RS 232 PORT FACILITIES,POWER &CONTROL WIRING WITH SUITABLE SIZE OF COPPER CONDUCTORS, EARTHING, TERMINATION, S/F OF THERMOSTATS TO SENSE THE AMBIENT, BTS TEMPERATURE, HUMIDISTAT ETC.AS PER THE DETAILED SPECIFICATION, TESTING & COMMISSIONING ETC OMPLETE AS REQUIRED.