Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank´s for your help, I already recived these manual from you
Text excerpt from page 11 (click to view)
INSTALLING THE COOKER HOOD
Please ensure that when the appliance is installed it is easily accessible to an engineer in the event of a breakdown. All installations must comply with the local authorities requirements for the discharge of exhaust air. Incorrect installation may affect the safety of this cooker hood.
Installation Requirements
Before installation check the wall to which the cooker hood is to be fitted for electric cables, water pipes or gas. If it is necessary to fix the hood to a hollow construction plaster or partition board structure then it should be sufficiently reinforced to be quite rigid in the area of the cooker hood mounting brackets, and the appropriate rawl plugs used for this type of fixing (not supplied).
Ducting
The ducting must be fire retardant (EFI 625) 100mm (4ins), and (EFI 630) 125mm (5ins) in diameter and the length should be no more than: 3 metres with one 90° bend 2 metres with two 90° bends Bends of more than 90° will reduce the efficiency of the hood and reduce the airflow.
Clearance Height
The cooker hood is designed to be fitted over a cooking appliance at the clearance heights stated, providing the maximum output of the appliance beneath does not exceed the maximums quoted in the Technical Specifications. If the output of the appliance below the cooker hood exceeds the maximum outputs quoted, please refer to the cooker manufacturer�s installation instructions.