What adjustment controls paint flow from a spray gun?

• A. Fluid control knob
• B. Fan control knob
• C. Trigger length
• D. Nozzle size

Answer: (A)

The fluid control knob is the part that directly adjusts how much paint moves through the gun. Turning it changes the size of the opening where the paint flows, so you can increase or decrease the paint delivery for a given air supply. This is what lets you dial in the right amount of coating to apply without runs or gaps.

The fan control knob affects the air that shapes the spray pattern, not the amount of paint. The nozzle size sets the fixed opening at the tip, influencing atomization and the maximum possible flow, but it isn’t the adjustable control you use during painting. The trigger initiates flow, but the precise control over how much paint comes out is provided by the fluid control knob.