A vectorized jet fan device for ventilation which is capable of directing high speed air stream discharged from the fan by a small angle at a higher flow speed for the primary purposes of efficiently meeting and utilizing space clearance and improving aerodynamic performance. The rod block is cut into a predetermined length. When the recording medium cartridge is inserted into a disc device, the inner rotor is rotated against the resilient force of the coil spring by a shutter opening mechanism provided in the disc recording and reproducing device. The prefix value is combined with the master key from the processing unit to create a random value that is the seed for a hashing algorithm. The compressible housing is lowered onto a suitable base member having upstanding probes which are also compressible and which physically engage respective ones of the conductors at one end thereof and an appropriate conductor on the other when the test apparatus is fully assembled and testing occurs. Such compositions find utility in the manufacture of automobile components, for example.