The Superior Model 25 High Output Smoke Blower designed specifically for smoke testing provides 4,000 cfm of smoke at 4.0 static pressure - double the normal output to push smoke through large systems requiring greater volume and pressure. The 25-HO can be used with Smoke Candles or Fluid to easily detect sources of surface inflow and faults in sewer lines. Developed over 50 years ago, the Superior Smoke Testing Technique remains the industry standard for sewer smoke testing today.