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4 HP
A 4 HP air compressor category filters by motor-power class, and the electrical requirements come from the individual unit rather than the HP number. Confirm the voltage, phase, and control requirements on each listing against your installation, and compare delivered CFM at the working PSI your tools require against your total demand.
Matching 4 HP To The Work Pattern
Your application matters as much as the motor class. Intermittent, single-tool work pulls air in bursts, while sustained use or running more than one tool at once raises total demand and leaves less room to spare. Small air compressors like the ones in this category will have a maximum duty cycle of 50%, so you need a compressor that delivers twice as much air as the application demands. Confirm whether your demand is occasional or steady before deciding, since the workload pattern is a separate check from the 4 HP figure itself.
Checking Air Delivery Behind A 4 HP Rating
Motor power is not airflow, so the figure that determines a match is delivered CFM measured at the working PSI your tools or process need. Check each product page for the rated CFM and the pressure at which it is stated, then set that against your totaled demand, since a maximum PSI figure is not the same as delivered airflow. If your verified demand is lighter, the 3 HP air compressors category may fit, while steady or simultaneous demand points toward the 5 HP air compressors category.
FAQ:
What electrical information should I confirm for 4 HP equipment?
Confirm the voltage, phase, and any control requirements on each product page against the service available at your installation, rather than assuming them from the HP rating.
How does sustained use affect a 4 HP sizing decision?
Sustained or simultaneous use raises total airflow demand, so total the air your tools draw at once and account for the 50% duty-cycle margin rather than sizing to a brief peak.
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