Inline duct fan, control system, and method of controlling the same

A method for controlling operation of an inline duct fan via a plurality of operating modes, the method comprising:

• configuring the inline duct fan to operate in one or more of the plurality of operating modes;
• detecting one or more HVAC commands;
• transitioning the inline duct fan from a first operating mode of the plurality of operating modes to a second operating mode of the plurality of operation modes based on the HVAC command;
• and
• adjusting a speed of the inline duct fan based on the inline duct fan in accordance with the second operating mode, wherein the speed of the inline duct fan is adjusted differently for different operation modes of the plurality of operating modes.

A method for adjusting airflow within an HVAC system, the method comprising:

• determining a first speed for an inline duct fan based on a comparison of a freewheeling speed to one or more predetermined speed thresholds;
• adjusting a speed of the inline duct fan to the first speed;
• determining if the speed of the inline duct fan is to be adjusted based on the first speed and an airflow threshold;
• determining a second speed for the inline duct fan based on the first speed being less than the airflow threshold;
• and
• adjusting the speed of the inline duct fan to the second speed.