Application. Mixing sections with AirM R1 top-flow and AirM R2 side-flow for recirculation systems, with back-up fan or for organising the air intake or exhaust in the desired direction. Design and materials. Service panels on the top for AirM R1 or on the side for AirM R2 allow the connection of standard dampers and flexible inserts of the appropriate size. The operating temperature range of the flowing air is -40°C to +70°C.