Replacement for existing ECS fans?
This Taiwan replica of the ECS fan mounted on many yachts is extremely attractively priced, but you have to accept a few disadvantages
The hole circle of the 4 outer screws in the stainless steel sheet deviates from the original, so you have to drill 4 additional holes in the deck. The supplied screws are consistently too thin for the existing holes and must be procured to match. The dimensions of the ventilation hole and the hole circle of the 6 retaining screws of the plastic parts are exactly the same as the original.
On the other hand, if you only want to replace the plastic parts and keep the cover plate, this is not possible because the size of the light entry opening is not identical.
Of course, you don't have these problems with a complete new installation, but it is noticeable that the designer of this fan copied the original without understanding how to assemble the clear water deflector and the deck flange do not really fit together well. For the form-fitting assembly, it was necessary to place 3 suitable polyamide washers between the deck flange and the water deflector to prevent the forces from causing mechanical damage when screwing. Unfortunately, we will only know when the time is up whether the UV stability of the plastics used is sufficient for this fan to also survive the 38 years that the ECS original survived.