Thank you for having the manual I needed for an older model Aiwa stero I had found on Ebay --- I wanted the Aiwa because I had tapes and cd's but I did not have a manual as to how to operate the system... I found what I needed and it has enabled me to set the system up for my enjoyment.
I wished detailed information of the JBL S310 and here I found it! Very happy with the service from this site!
Text excerpt from page 5 (click to view)
The appliance can be installed to recirculate or extract contaminated air. The cooker hood is more effective when used in the extraction mode.
Recirculation
The cooker hood is supplied specified for use in the recirculation mode with the charcoal filter fitted. In the recirculation mode contaminated air is passed through the charcoal filter to be purified and recirculated into the kitchen through a recirculation grille.