I have an old furnace blower that I want to convert to a shop air clearner. I want the motor to operate from a normal 110 volt switch. My question is which wires do I connect to the switch? The motor is a 1/2 hp Emerson Model K55HXLGG3702 It has 6 wires - black, white, brown, blue, red, yellow

The white wire bypasses the switch and connects directly to white wire of the power feed. All the rest connect to different motor windings. Power to each different combination should give a different speed. I don't think any of them would be reverse. I doubt you find out which ones are which without a diagram from the manufacturer. I don't know how many you can connect at once, maybe even all of them for the highest speed. There may be some conventions for which wore is which, but I don't know them. I am not sure others here will too. We have good people here in some areas, but some gaps.

Look at the label on the motor, it should tell you what goes where. The white is typically the neutral(yellow is used by some mfrs), and the others are speed legs, with each color wire representing a different speed. The brown wire sounds like a capacitor lead-so watch your wiring schematic closely and see what hooks up where. Cut and tape off all unused leads, and secure them with a "zip" or plastic wire tie.

DO NOT COMBINE WIRE COMBINATIONS. The motor will almost definitely "release it's smoke" if you do...