Three Speed Wiring Instruction   1. Wiring Diagram: N: COMMONLC: LOW SPEEDLB: MIDDLE SPEEDLA: HIGH SPEED   2. Wiring with REB speed control: Remark:To avoid influencing the fan service life,the optimal adjustable speed range is from 70%~100%. 3. Switch control: N: COMMONLC: LOW SPEEDLB: MIDDLE SPEEDLA: HIGH SPEED

Two Speeds Inline Fan Wiring Instruction 1. Wiring Diagram: N: COMMONLB: LOW SPEEDLA: HIGH SPEED 2. Wiring with REB Speed Control: Remark:To avoid influencing the fan service life,the optimal adjustable speed range is from 70% to 100%. 3. Switch Control: N: COMMONLB: LOW SPEEDLA: HIGH SPEEDC: SWITCH     How to Reduce Inline Fans Noise?

What Is an Inline Duct Fan and How Does It Work? These fans are spherical and are used to cover one ductwork section. As a result, your HVAC ducting will need to be worked on and exposed to install inline duct fans. Depending on the unit, some may be plugged in, while others require hardwiring and a relay to notify the furnace to turn on and off. As a result, an electrician may be necessary for installation in some cases. Know the form and size of your ductwork before making a purchase. This guarantees that you...