Has two pieces in my 30sqm large glassed "fall / spring" utrum isolated decking.
The fans are bothered by about 10 degrees above the outside temperature, which was worse than I hoped for. Feel that the air blowing from the fan at full speed the training is "fes lukewarm".
Not the special silent (about 50-52 dB) Nor, except in the lowest position (900W) where they certainly are quiet, but heats hardly at all.
So, for me, these were not right.
This fan is good.
At minimum power the fan runs at a slower speed and making noise thus not not very much.
It has 3 power modes. 950W, 1080W and 1820W (measured on my copy).
The fan can also be run without heat.