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I am installing a ceiling fan, and the instructions say to not use a full range dimmer switch to control fan speed with. What exactly is a full range dimmer switch? The existing dimmer switch that controlled the old fan speed turns on in stages, 1-2-3, as compared to a continuously sliding type ( "full range" ???) dimmer that has no presets. Why would the manufacturer say not to use a full range dimmer switch to begin with? THX much for your reply.