A laminar flow air mover includes a centrifugal fan having an outlet connected to a conduit system detachably mounted relative to the air mover. The antenna is movably installed between first and second contacts, and transmits and receives first and second signals of different frequency bands. The support structure includes means for adjusting the height and angle of the platform. The second and third lens plates are connected. This protective coating comprises a synthetic resin solid content ; and a mixture of acetylene glycol represented by the following general formula :andor an ethoxylated derivative of the acetylene glycol represented by the following general formula : at least one member selected from polyoxy block polymers represented by the following formula :OwxyzH\u2003\u2003. This invention is unique in that it destroys the virus directly, blocking the cold virus at its point of entry, and the remaining cold symptoms never appear.