A duct fan that can be used with or without a carbon filter. TT100 has two modes, one at 147m3/h and another at 187m3/h.
In- and exhaust 100mm
Effect: 147m3 noise level 28dBA
Effect: 187m3 noise level 36dBA
To change the speed of the fan, just change the cord's position between L1 and L2.
The cord attached to the N will always be there and you can never connect L1 same time as L2!