The Model 20 High-Output Smoke Blower from Superior Signal Company blasts 4,000 cfm of smoke at 4.0 static pressure to push smoke through large systems requiring high volume and pressure. It fits all standard manholes, plus has a second outlet to blow into pipes and other openings. It can be configured for use with smoke candles or smoke fluid to quickly and easily detect sources of surface inflow and other faults in sanitary sewer lines. It has an insulated heating chamber with a stainless steel injector to maximize dry smoke output, and high-quality liquid-based smoke. 800/945-8378; www.superiorsignal.com.