In a known way, fill packs, and in particular honeycomb fill packs are composed of pleated or corrugated plastic layers L, said layers being placed side by side and glued to one another to form, with the respective pleats, a series of small tubes inclined with respect to the vertical, suitable to allow {HEAD ~ the air flow} according to {TAIL ~ F1} to pass through and to offer a large contact surface with said flow 
according to
In a known way , fill packs , and in particular honeycomb fill packs are composed of pleated or corrugated plastic layers L , said layers being placed side by side and glued to one another to form , with the respective pleats , a series of small tubes inclined with respect to the vertical , suitable to allow { HEAD ~ the air flow } according to { TAIL ~ F1 } to pass through and to offer a large contact surface with said flow
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