Keeps the tank below 28, was hitting 31 before this fan. It's also a lot quieter than my old one.

Further to my review, having experienced a really hot spell in UK, the fan has performed well.
I did have to back it up with additional fan occasionally, but as I say, it's been really hot (30c + at times).
One thing I have discovered, which is slightly disappointing, is that the grill covering the blades isn't stainless & showed signs of rust so I've taken it off. Otherwise - spot on.

Got this fan to replace a makeshift DIY job I'd cobbled together blowing in the sump of my 300L system.
I have it controlled by a STC-1000, and it works a treat. As the description states "makes big wind"!
It cools the system by about 3-4 degrees over about 2 hours. It's not silent, but in the sump cabinet I can't hear it so no problem.
Good build quality too.

This thing works great, makes very little noise and it is able to cool, my 200 l tank a few degrees in only a couple of hours.

Very happy with it, again, you can't go wrong with this fan.

a little noisy, but works effectively

Funcona perfectamente,lo recomiendo

excellent produit

Prodotto dalle ottime caratteristiche, silenzioso e potente, efficace ne raffreddare di 4°/5° su 250 litri.

Excellent quality, can rediuce the temperature 4-5° on a 260 liter.