Film tube (5) for the circulating therethrough of air for optimising the climate in a cultivation space. This film tube (5) can be suspended from some form of construction in, for example, a greenhouse (1). Suspension is effected as a result of the fact that there is attached in said film tube (5) a carrier (8,18,28) extending in the longitudinal direction thereof. A perforation is formed through the film tube (5) for receiving therethrough a suspension member such as a hook (13). This hook (13) also engages with the carrier (8,18,28) in such a way as to allow longitudinal forces acting on the film tube (5) to be accommodated. A film tube (5) of this type can, for example, be suspended below cultivation drainpipes. The carrier (8,18,28) can comprise a belt consisting of two remote longitudinal strands and transverse strands extending therebetween, there being delimited between each two longitudinal strands and transverse strands an opening for the receiving therethrough of the hook (13).
