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 13 (click to view)
Venting
The hood is more effective when used in the extraction setting (ducted to the outside). Venting kits may be purchased through your retailer or DIY store, and must be ducted to an outside vent of 100mm (4�) minimum.
The ducting used must be manufactured from fire retardant material.
When the hood is ducted externally the charcoal filter must be removed.
To Fit the Ducting
1. Open the grille by pressing inwardly on the actuator bolts at each side of the grille, while pulling the grille panel downwards. The grille panel will slide into the intermediate position. Raise the lower edge of the grille forward through 45° angle until the grille becomes detached from the slide mechanism. Align the flat sides on the spigot with the recesses in the top of the casing. Insert and snap fix the spigot into the casing. Connect the ducting to the spigot and make an air tight seal. Remove the charcoal filter.
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Recirculation
The charcoal filter (optional extra) must be fitted for recirculation.
