Supply and Installation of Free cooling units (Exhaust Fans with Filters) at various BTS sites under Bhubaneswar BA

Supply of exhaust fans by a new complete set of 380mm /15" heavy duty 1400 RPM Exhaust Fans having maximum free air delivering capacity not less than 3250 m3/ hour (1910 CFM) and maximum sound level not more than 60-65 db. with a capacitor start and run type, continuously rated, totally enclosed and ruggedly built motor having pre-lubricated double ball bearing with Class "A" and "E" insulation suitable for operation on 230 volts single phase 50 HZ AC supply with features for smooth & silent operation to deliver the maximum output at lower operating cost. The impeller of the Exhaust Fan is to be propeller type and both hub and impeller are to be dynamically balances and frames and arms mounted on rubber bushing so that, vibration are virtually eliminated. (Make- Almonard HD (ISI) / Crompton Greaves or similar superior) (Excluding installation)

Installation of exhaust fan up to 450mm sweep in the existing wall/shelter opening with fastener/ GI nuts and bolts, including making good the damage, connection, testing, commissioning etc. as required

Supplying and installation of gravity type Aluminum/ GI louver shutters suitable for 380mm sweep exhaust fans with fastener /GI nuts and bolts etc. complete as required.

Making opening on brick wall of suitable size for fixing of 380mm sweep Exhaust Fans including making good the damages, minor civil works etc. complete as required. (For room sites)

Supply of 450mm X 450mm X 50mm size panel type Inlet Air Filter having washable Synthetic Fiber filtration medium, GI/Aluminium frame with aluminium /spray iron protect mesh capable for air filtration 35 microns (maximum size ) and maximum air handling capacity of 2000 CFM, including fixing the same in existing GI /MS frame structure etc. complete as required.

Supply of inlet Air filter housing cum louver unit of following size , made of 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 width GI supporting strip of length 560 mm with drill holes at both ends in front facia for holding the air filter in position, louver blades of 100mm width of required quantities shall be welded horizontally at back side of the filter housing frame with half of the portions remain outside the frame at an angle of about 30 deg downwards to prevent entering of rain water into the room/shelter , a GI /stainless steel protective wire mesh of size 2.64mmX2.64mm, having wire diameter 14 SWG & each square size 25mmX25mm (distance from centre to centre of wire - 25mm 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 Engineer in charge, including fixing the same in existing opening with Fastener /GI nuts and bolts etc. complete as required. (Drawing and Sample are to be got approved from the Engineer in charge before execution).

Overall Size 460mm (Width) X 450 mm (Height) X 300 mm (Depth) - For Room sites

Making of air inlet opening on brick wall of approximate size 450mm X 460mm, suitable for fixing the filter housing cum louver unit including making good the damages, minor civil works etc. as required.

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.

Replacement of the burnt out Exhaust fan motors only by new one of 380mm /15" heavy duty 1400 RPM, capacitor start and run type, continuously rated, totally enclosed and ruggedly built type motor having pre lubricated double ball bearing with Class "A" and "E" insulation suitable for operation on 230 volts single phase 50 HZ AC supply, connection and testing etc. complete as required. (make: Almonard model – 380/15” H/D). (The dismantled burnt-out motor may be retained by the agency) (Make- Almonard HD (ISI) / Crompton Greaves as per the make and model of old motor)

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 <26o C - All Exhaust Fans are to be switched OFF with LED indicator "LT". (2). When the room temperature is in between 26o C to 35o 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 35o C:- Both Exhaust fans will be worked simultaneously with 10 minutes rest for each one alternatively after continous running of one hour. (Note: Where only one Exhaust fan is available, the same is to be operated continuously when room temperature is > 26o C with 10 minutes rest for every one hour of continous operation.)

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