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Step controllers get a bad reputation because so many cheap ones click loudly between speeds or make your fan hum at low settings
curative if you spot pythium early
this is one of the better options out there
though they're designed for static rooms and vehicles rather than plugging directly into a 12V socket
Display: LCD screen with automatic dimming and green LED backlight (non-disruptive to plants)
G.A.S - EC5 Fan Speed Controller Beneficial Inoculants Step controllers get a badG. A. S EC5 Fan Speed Controller Reactive Temperature Technology for EC Fan Pairs Best for: growers who want the fastest reacting thermostatic control G. A. S offers for a pair of EC intake and extraction fans. Our thoughts This is the top of G. A. S's EC controller range for a reason Reactive Temperature Technology means it doesn't just react to temperature, it reacts to the rate of change, so a sudden heat spike gets dealt with fast rather than the
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