Abstract: A stabilizer for a ventilation duct includes a sensor, sensitive to a variable parameter such as temperature, which affects the flow of air in the duct. The sensor includes an opening in a return flow conduit communicating with a deformable chamber contained within a section of the duct. As the parameter changes, pressure at the opening changes thereby affecting the volume of the chamber and likewise the volume of the section of the duct in which the chamber is located.

Abstract: A bladder, suitably formed of silicone rubber and molded into a cylindrical shape, is provided internally with a deforming spring. The resultant unit serves as a delivery stabilizer for a ventilation shaft without loss of elasticity of the bladder.

Abstract: An insufflation nozzle, which has a plane of symmetry, includes a sleeve having an inlet which is symmetrical about an axis and an outlet orifice. A deflector is disposed to face the outlet orifice and extends transversely with respect to the axis. A link is provided between the deflector and the sleeve to permit movement of these components relative to one another. The link includes a screen disposed symmetrically with respect to the plane of symmetry. A surface of the deflector which is directed toward the sleeve has planar portions which are inclined relative to the axis and have a spacing, relative to the outlet orifice of the sleeve, which increases along a direction extending away from the screen.