The extractors are inserted inside an aluminium tube frame with sheet panels covered entirely with sound-absorbent materials. One side can be opened easily for internal inspections.
The version with a single-phase motor is coupled directly to the fan wheel with so-called reverse blades.An electronic controller may be required to adjust speed.
The version with a triple-phase motor is equipped with a belt transmission to activate the fan wheel for more professional uses. In this case, there are two transmission speeds and an electronic controller cannot be used.
...._._______....Directly coupled __..___.._....._|____________with gear _
