Installation preparation

Any installation position.
IP 20 degree of protection only when installed in ducts with at least 1 m of duct on the suction and pressure sides.
Only install on walls, ceilings or brackets with sufficient load-bearing capacity.

Decide on the installation location. Make sure there is sufficient space to the wall/ceiling.
Make provision for a service opening for the terminal box and fan unit.
Lay a permanent power cable to the installation location.
Loosen both knurled thumb screws [2] at the EFR Flatbox and remove the mounting bracket [3].

Duct preparation

Folded spiral-seams ducts with a diameter DN 100 or DN 125 are recommended, depending on the unit type.
Only use folded spiral-seams ducts that match the nominal diameter.
Connect the ducting to the duct fan using flexible cuffs, e.g. Maico ELR, in order to prevent the transmission of vibrations to the duct system.
Install an air filter, e.g. Maico TFE if operating the unit in a dusty environment.