As some of you know, I've been revisiting my ventilation the last few weeks.
The toys I have been playing with are :-
RVK 6" L1
RVK 5" L1
RVK 5" A1
RVK 4" A1
The two L1's are new 'toys', the A1's are existing ventilation.
Now, with the A1's, any fan controller worked well... if the fan dropped much below 50% there was a discernible hum... but nothing that would disturb you
The L1's - they hum like the Welsh mens choir tuning up on any of my existing controllers. They even hummed at 100%!
I got a Hydor from Ebay, cheap as chips (and with good reviews here) at about 70- 100% fine, but, below that hum... not as bad as my A1 controllers... but there...
So, I suppose I'm saying is this...
If the RVK has a large capacitor slapped to the side of it then a fan controller is a lot more expensive than the other sort!
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