"concertina" aspiration aircraft
"CONCERTINA" ASPIRATION AIRCRAFT
Ventilation duct is the Fip brand that identifies the ventilation pipe suitable for the delivery of fresh and pure air, taken from the outside, to the excavation face and to any intermediate stations of the tunnels in progress.
Ventilation duct Concertina is the version provided with a harmonic steel spiral, thanks to which it is kept open and can also be used in suction, favoring the purification of air through the discharge of dust, fumes and gas from the excavation face.
Ventilation duct Concertina is suitable for the realization of curves, joints and derivations in general, of all those non-linear paths in which, maintaining its circularity, it is preferred for lightness, cost and size, to rigid metal connections. Moreover it can also be axially reduced up to 90% of its length.
It can be made with S-X (normal) or S-A (anti-static - ATEX) fabric, in diameters from 200 to 2200 mm and with standard spiral pitch of mm.150 or mm. 75 for a greater radius of curvature and greater resistance to depression. For the joints are available versions with zip, with velcro or with ring joint.