Bharat Sanchar Nigam Limited Tender

Supply & Installation of gravity type Aluminium/GI louver shutters suitable for upto 450mm sweep exhaust fans with fastner/GI nuts and bolts etc complete as required.

Making of air inlet opening on brick wall of approximate size 450mmX460mm, suitable for fixing the filter housing cum louver unit including making good the damages, minor civil works etc. as required.

Supply of 150mm x 450mmx 50mm size panel type inlet Air Filter having washable synthetic Fiber filteration medium,GI/Aluminium frame with Aluminium/Spray iron protecting mesh capable for air filteration 35 microns(Miaximum size) and maximum air handling capacity of 2000 CFM , including fixing the same in existing the same in existing GI/MS frame structure etc complete as required.

Supply of inlet air filter housing come louver unit of following over all size made 18 SWG GI sheet with collars of about 50mm width in all front sides suitable size drill holes for fixing the same on wall detachable 18 SWG thick 10mm wide GI supporting strip of length 560mm with drill holes at both end in front facia for holding the air filter in position louver blades of 100mm wide of required quantities shall be welded horinzontally at back side of the filter housing frame with half of the portion remain out side the frame at an anlge of about 30 degree downwards to prevent entering of rain water into the room shelter GI/stainless steel protecting wiremesh type (25mm x25mmx 2.64mm x2.64mm) (wire diameter 14 SWG -2.64mm distance from centre to centre of wire-25 mm for both main and cross) to be welded inside the GI sheet housing frame painting the welded spots by aluminium oxide paint etc as per the direction of Engineering-in charge i/c fixing the same in existing Opening with fastner /GI nuts and bolts etc complete as reqd.

Overall size 460mm (wideth) x 450mm height) x 300 mm depth)-for Room BTS sites.

Supply and fixing of 2 Amps, C- Series, 240 volts, 50 Hz, 10 KA SP MCB in existing MCBDB for exhaust fan protection i/c connection, testing etc. as required.

Supply of 3core 1.5sqmm PVC insulated and PVC sheathed copper conductor un-armoured cable i/c laying of the same on surface of wall/shelter with PVC C- clamps or on existing cable tray etc. complete as required.

Supplying & fixing 24hour timer switch (Auto/Manual) for intermittent operation / resting period of exhaust fan having features like Modular construction, Inbuilt over-ride facility, High switching capacity, Tamper proof sealing, Analog & Digital version, Daily/Weekly Programming etc. together with fixing / necessary wiring complete as required.

Supply and fixing of thermo-sequential Exhaust fan controller suitable for operation with 230 volts AC supply for controlling the operation of single/double exhaust fans by sensing the room temperatures with the following logics. consisting of auto/manual switch for by passing the controller in case of faults in the controller itself. 6A, 230 volt relay contacts for switching on and off the exhaust fans, connecting terminals and LED indicators for indicating the ON/OFF status of the Exhaust fans, for Low Temperature (LT), Medium Temperature (MT) and High Temperature (HT) of the room, sensing probe with connecting wire etc. enclosed in a compact powder coated MS box complete as required. (Logics for operation of Exhaust Fans: (1). At room Temperature 26' C - All Exhaust Fans are to be switched OFF with LED indicator “LT". (2). When the room temperature is in between 2ft C to 35° C:- Only one Exhaust fan will be worked at a time and is to be altered after 1 hour of continuous operation with LED indication "MT' and (3). When room temperature increases beyond 35° C;- Both Exhaust fans will be worked simultaneously with 10 minutes rest for each one alternatively after continuous running of one hour. (Note: Where only one Exhaust fan is available, the same Is to be operated continuously when room temperature is 260 C with 10 minutes rest for every one hour of continuous operation.)

Removing the existing old 1.5TR WAC units along with outer housing & its supporting structures from its positions after disconnection of power supply, storing the materials etc. complete as reqd.

Closing the existing wall openings of the old WAC units properly i/c supplying of required materials i.e bricks, cement, sand, fasteners, nuts and bolts etc. complete as required as per the following methods.

a) Closing of wall openings with bricks, cement, sand, plastering the surface and painting etc. as required.

b) Closing of Shelter wall with suitable size plywood of thickness not less than 16mm at both inside and outside of the wall with suitable size fasteners/nuts and bolts etc. as required (Only suitable for specific areas).

c) Closing of Shelter wall with suitable GI of thickness not less than 16SWG / MS Sheet 5mmthick at outside of the shelter / wall with suitable size fasteners / nuts and bolts i/c cutting welding complete as required etc. as required.