is is associated with or forms at least part of the magnet 38 in this embodiment the magnet 38 may cling to the housing 24 as shown in fig2 the counter weight 34 is then preferably made from a ferromagnetic material e g steel or iron the magnet 38 firmly closes the flap 26 when it is in its closed position e g when the spool 18 is in its stowed position when the motor 30 is no longer powered or receives a signal to deploy the fire and or smoke barrier 14 a cord 40 may be unwound from a spool 42 that is connected to the motor 30 as the spool 42 turns the cord 40 may be wound onto a bobbin 44 that is connected to the spool 18 or is part of it after a short period of time the cord 40 as well as the assemblage 18 comes in contact with the flap 26 and pushes it open as is shown in solid line 40 u2033 the closure member 26 u2032 is thus prevented from closing by the cord 40 u2033 fig3 a and 3 b shows another embodiment of the present invention in which the closure member 26 comprises tip elements 46 1 46 2 that are designed so that they can only contact the cord 40 as opposed to either the bobbin 44 and the fire and or smoke barrier 14 as shown in fig3 b there may be two strings of cord 40 1 40 2 that are separate from.