A vacuum system’s rated airflow does not necessarily equal the airflow available at the duct opening. Hose length, diameter, bends, connections, leakage, filters, and duct resistance can all affect the operating condition of the complete extraction path. Hose...
A contractor who blocks every register except the one nearest the vacuum connection is not maximizing suction. In most systems, that contractor is starving the fan curve, spiking static pressure past the point where the motor delivers useful airflow, and pulling...
Pressure means nothing without volume. A compressor rated at 150 PSI is useless for duct agitation if it cannot sustain airflow under load. This is the single most misunderstood spec on a contractor’s equipment sheet, and it is why crews running undersized...
Negative pressure is not a switch you flip. It is a verifiable engineering state, a closed envelope where air is measurably moving from the surrounding space into the ductwork, and nowhere else. Guessing does not qualify. Turning on the vacuum and assuming containment...
