The blower is recommended to be located outside of the test lab to isolate the noise generated by the blower. Locate the shaker cooling blower so that the duct run between the shaker and blower is short and direct to minimize pressure loss in the duct. Be sure to connect it to the blower inlet, coaxial with the motor shaft, so the blower acts as a suction blower, pulling air through the shaker and exhausting it from the blower outlet
The maximum length of the duct supplied by manufacturer is 4.0 or 4.5 meters. Connect air duct between shaker and blower. The air duct should be mounted firmly to the shaker outlet and blower inlet by screwing the yoke provided
NOTE: COOLING BLOWER SHOULD BE LOCATED IN AN AREA REMOTE FROM THE SHAKER TO REDUCE THE BACKGROUND ACCOUSTIC NOICE LEVEL AROUND THE SHAKER. A FLEXIBLE DUCT OF 4.5 METER (WHEN STRETCHING) IS SUPPLIED WITH THE SHAKER SYSTEM. FIXED DUCKWORK (FOR EXAMPLE, THE PVC OR THIN SHEET METAL DUCT WITH SMOOTH INNER SURFACE) OF 200 MM OUTER DIAMETER (THE INNER DIAMETER MUST BE BIGGER THAN 190mm) CAN BE USED IF THE TOTAL RUN LENGTH DOES NOT EXCEED 7.5 METERS. LARGER 250 MM INNER DIAMETER FIXED DUCTWORK SHOULD BE USED FOR RUN LENGTH FROM 7 TO 11 METERS. 300 MM INNER DIAMETER IS FOR RUNNING FOR 11 TO 20 METERS. IF THE FIXED DUCKWORK IS ADOPTED, THE SUPPLIED FLEXIBLE DUCT WILL BE CUT AND USED AS TWO ENDS ADAPTOR ONLY, 2 METERS FOR THE END TO SHAKER AND 1 METER FOR THE END TO BLOWER. AND AT THIS SITUATION, THE FLEXIBLE DUCT MUST BE IN SHRINK.
IF LENGTHENING THE DUCT, MAX 3 TURNINGS ARE ALLOWED. THE TURNING MUST BE MADE BY 2 PIECES OF 45 DEGREE CONNECTORS. EVERY TURNING WILL REDUCE 1 METER OF ABOVE LEGTH EQUIVALENTLY. FOR EXAMPLE, IF THERE ARE 3 TURNINGS WHEN THE DUCT DIAMETER IS 300MM, THE MAX LENGTH IS LIMITED TO 22 METERS.