| ■ Mechanical safety • As standard equipment, the motors shall have an internal thermal overload protection (TOP) sensor. • The minimum motor insulation class shall be IP55 in compliance with EN 60529 (IK0B in compliance with EN 50102). They shall have a minimum coefficient of efficiency of EFF2 in accordance with CEMEP criteria. • A non-removable, hinge-mounted door guard (optional), requiring a special tool for opening, in compliance with EN 292.2, shall guarantee personal safety. • Mechanical adjustment of the Fan/Motor assembly (belt tension) shall be by way of a single piece sliding platform (notched rails for motors > 22 kW) adjustable by a single screw, without having to slacken the motor mounting. Thus, motor alignment shall remain fixed. • As standard equipment, Fan/Motor assemblies shall be mounted on rubber vibration-absorbing pads (spring mounting available as an option). This assembly shall not rest directly on the floor panel but shall rest on an intermediate base frame comprising at least 2 main cross members in order to spread the load generated by the Fan / Motor assembly in a even manner (without any excess pressure points) in order to retain the rigidity characteristics of the AHU's lower panel. ■ Filters • The filtration systems shall meet the requirements of the EN 779 standard in terms of gravimetric and opacimetric categories and the requirements of the EN 1B22 standard for high efficiency categories. • The air tightness of the filtering surface shall comply with Class F9 of the EN 1BB6 standard. • The filtration surface shall comprise rail-mounted filter cells, with the addition of a foam seal between the frame's outer surround and the filter cells, and the addition of mastic sealing between the filtration surface frame and the air handling unit tunnel. • The filtration surface air tightness shall be ensured by way of a sliding rail actuated by a compression handle. • The filters shall be selected in averagely clogged mode. ■ Water coils_ • The coils shall comprise a finned block with copper tubes. The copper tubes shall be deoxidised by the phosphorous electrolysis method. The aluminium fins shall be with a pitch of 2.1, 2.5 or 3.2 mm. • The coils shall be mounted on slide rails. • A condensate tray shall be integrated in the coil. It shall be inclined to prevent any water retention. It shall have folded edges and be slide rail mounted for easy removal with the aim of perfect decontamination. • The fitment of a water droplet eliminator shall be obligatory when the air velocity across the coil exceeds 2.7 m/ sec. • Hydraulic connections shall be of the gas thread male threaded type or smooth type for diameters > 50/60. • The coil shall be tested to a pressure of 16 bar for a service pressure of 10 bar. ■ €lectric heating coils • The electric heating coils shall comprise a series of stainless steel sheathed heating resistances. They shall be prewired and connected to a terminal block located behind an access door. The coils shall be mounted on sliding rails. The equipment shall be protected by a manual reset safety thermostat. The power supply to the electric heating coil shall be dependent on fan operation. ■ Dampers They shall be capable of being motorized and be selected from the following versions : • Standard : galvanised steel blades, blades driven by tie rods, polyamide bearings, 1300 Pa admissible pressure for a 1 metre length. • Isolation (airtight) : as a minimum requirement, the tightness shall be in compliance with EN 1751, galvanised steel blades, blades driven by tie rods, nylon bearings, 1300 Pa admissible pressure for a 1 metre length. • Reinforced air tightness : isolation damper for clean room, operating theatre, laboratory...As a minimum requirement the tightness shall be in compliance with Class 4 (total leakage) and Class 3 (frame leakage) in compliance with EN 1751, enabling its usage in the event of formolisation disinfection procedures. ■ Heat recovery (heat pipe, thermal mheel or run around coils as an option) • Plate recuperator : It shall be made of aluminium and adapted for a differential pressure of 1000 Pa. • The leakage rate between the two air streams shall be less than 1 %. • A condensate tray with a threaded condensate drainage pipe shall be mounted on the extracted air side. • A by-pass shall be proposed as an option for free cooling, for reducing or eliminating the antifreeze coil upstream of the recuperator or for preventing plate clogging during periods when heat recovery is not required. | 
