The NP21 monorail systems is basically a special aluminium track profile with trolleys running inside the track profile. The profile is installed with joint pins, split pins, end stops and suitable bolt sets, and it is top mounted to a suitable steel bracket. The bracket is fixed to the building.

The NP21 is lthe largest monorail in the top mounted monorail product family. The shape of all these monorails are the same. NP21 can be used together with NP04.

The NP21 monorail can be easily hidden inside the ceiling or under the soffit of the roof. The result is that the monorail will become almost "invisible" from underneath.

Each trolley can carry loads up to 600 kg.

Normal maximal distance between brackets is 4,8 meter. 

Normally the trolleys will carry access platforms like:

- suspended platforms

- traversing gantries

- traversing ladders

- other facade or roof access applications.

The NP21 monorail system can only be installed horizontally.

The monorail can not be rolled or bent.