GAIL (India) Limited

10ACTUATOR:In case of motorised smoke -cum-fire damper it shall have its own panel which willincorporate necessary circuit required to stop down voltage available from UPS oremergency power supply to show the status of damper (open or closed), to allowremoting testing of damper & indication in event of damper clouser due to signal fromsmoke sensor/temp sensor & reset button Additional terminal will be provided to havesingle (sound beep or visual)in central control room. The fire damper shall be mounted infire rated wall with a duct sleeve 400mm/500mm long depending upon the wallthickness. The sleeve shall be factory filled of fire damper the joints at sleeves end shall beslip on type minimum thickness of GI sheet shall be 18g. The fire damper shall beinstalled in accordance with the installation method recommended by the manufacturer9.0 SUPPLY AND RETURN AIR GRILLES:Supply and return air grilles shall be MS or anodized extruded aluminium constructionwith individually adjustable bars as shown on drawings and indicated in schedule ofquantities. Supply air grilles shall be generally double deflection type, with removablekey operated volume control dampers. Return air grilles shall be generally doubledeflection type similar to supply air grilles but without dampers. All supply and return airgrilles behind wooden grilles shall be single deflection type with one way bars only, thesupply air grilles being provided with removable key operated volume control dampers.Mild steel supply and return air grilles shall be factory coated with rust resistant primerand shall be finished with two coats of paint as per client's choice. Aluminium supplyand return grilles shall be powder coated and to have colour of client's choice or extrudedaluminium as per bill of quantities.10.0 SUPPLY AND RETURN AIR DIFFUSERS:\Supply and return air diffusers shall be shown on the drawings and indicated in scheduleof quantities. The supply air diffuser shall be provided with removable key operativevolume control dampers. Mild steel diffusers/dampers shall be factory coated with rustresistant primer. These shall be finished with two coats of paint as per client's choiceAluminium supply and return air diffusers shall be powder coaled and to have colour ofclient's choice or shall be extruded aluminiumi. Round or Rectangular Diffusers:Supply/return air linear diffuser shall be MS or Extruded aluminiumconstruction, square, rectangular, or round diffusers with flush fixed pattern oradjustable flow pattern. Diffusers for different spaces shall be selected inconsultation with the Architect/Consultants Supply air diffusers may beequipped with fixed air-distribution grids, removable key-operated volumecontrol dampers, and antismudge rings as per requirements of schedule ofquantities.ii.Linear Supply air/ Return Air Grilles:This shall be extruded aluminium construction with fixed horizontal bars at 15dig inclination and flange on both side. The thickness of fixed bar louvers shall beat least 5.5mm & angle shall be 20mm/30mm inside The grilles shall be suitablefor concealed fixing volume control damper of extruded. Aluminium constructionwith black anodised finished shall be provided in SA duct collars