Description
Continuous-Duty Shop Air, 24/7 — Schulz 20 HP Rotary Screw Air Compressor (74 CFM, 230V)
Reciprocating compressors are built for intermittent use — run one all day and it overheats, wears out, and starves your tools for air. The Schulz 20 HP rotary screw compressor (SKU 970.3903-0) is designed for 100% continuous duty, delivering a steady 74 CFM of clean, cool, low-pulsation air for production environments that run all shift. With a 120-gallon ASME tank and 230V three-phase power, it drops in as the backbone of a busy shop’s air system. Sizing a screw compressor to your actual demand matters — call or text CET at 586-210-0555 before ordering and we will confirm the right model for your CFM and electrical service.
✓ 100% continuous-duty rotary screw airend • ✓ 74 CFM steady delivery • ✓ Up to 125 psig • ✓ Low noise, low pulsation • ✓ 20 HP / 230V 3-phase
SKU: 970.3903-0 • Motor: 20 HP • Air Delivery: 74 CFM • Power: 230V 3-PH • Tank: 120-gallon ASME tank
Max Pressure: 125 psig • CET Verified • Call or text 586-210-0555 — confirm sizing before ordering
Overview
At a Glance
Specifications
Tech Specs
| SKU | 970.3903-0 |
| Motor | 20 HP |
| Air Delivery | 74 CFM |
| Max Working Pressure | 125 psig |
| Electrical | 230V / 3-Phase / 60 Hz |
| Compressor Type | Rotary screw, oil-flooded, air-cooled |
| Tank | 120-gallon ASME horizontal |
| Dimensions (L × W × H) | 40" × 59" × 30" |
| Weight | 1200 lb |
Common Questions
Frequently Asked Questions
- Why choose rotary screw over a piston compressor?
- Rotary screw compressors run continuously without overheating, deliver steady low-pulsation air, run quieter, and last far longer under heavy use. Piston (reciprocating) units are better for intermittent light-duty work; for a shop that runs air most of the day, a screw compressor is the right tool.
- How much CFM do I actually need?
- Add up the CFM demand of every tool that runs at once, then add headroom for leaks and future growth. This 20 HP model delivers 74 CFM. Undersizing causes pressure drops and short-cycling; oversizing wastes energy. Call or text 586-210-0555 with your tool list and CET will size it correctly.
- What electrical service does it require?
- This unit is wired for 230V / 3-Phase / 60 Hz. Confirm your shop’s available voltage and phase before ordering — a 460V three-phase unit will not run on 230V service and vice versa. If you are unsure, call or text 586-210-0555.
- Do I need an air dryer with it?
- For most production air — especially finishing, painting, and instrument air — yes. A refrigerated dryer downstream removes moisture that would otherwise rust piping and ruin finishes. CET can match a Schulz ADS dryer to this compressor’s output; call or text 586-210-0555.
All Screw Models
Find the Right Schulz Screw Compressor
The Schulz rotary screw line spans 8 to 50 HP in 230V and 460V configurations. Every model is CET Verified. Not sure which fits your demand and electrical service? Ask for a CET sizing match.
| Motor | Air Delivery | Tank | Power | SKU | Order |
|---|---|---|---|---|---|
| 8 HP | 27 CFM | 60 gal | 230V 1-PH | 970.3980-0 | Order |
| 8 HP | 27 CFM | 60 gal | 230V 1-PH | 970.3890-0 | Order |
| 8 HP | 27 CFM | 60 gal | 230V 3-PH | 970.3891-0 | Order |
| 8 HP | 27 CFM | 60 gal | 230V 3-PH | 970.4075-0 | Order |
| 8 HP | 27 CFM | 60 gal | 460V 3-PH | 970.3891-460 | Order |
| 8 HP | 27 CFM | 60 gal | 460V 3-PH | 970.4075-460 | Order |
| 10 HP | 35 CFM | 120 gal | 230V 3-PH | 970.3902-0 | Order |
| 10 HP | 35 CFM | 120 gal | 460V 3-PH | 970.3902-460 | Order |
| 15 HP | 51 CFM | 120 gal | 230V 3-PH | 970.3455-0 | Order |
| 15 HP | 51 CFM | 60 gal | 230V 3-PH | 970.3454-0/F | Order |
| 15 HP | 51 CFM | 60 gal | 460V 3-PH | 970.3454-460 | Order |
| 15 HP | 51 CFM | 120 gal | 460V 3-PH | 970.3455-460 | Order |
| 20 HP | 74 CFM | 120 gal | 230V 3-PH | 970.3903-0 | Current |
| 20 HP | 74 CFM | 120 gal | 460V 3-PH | 970.3903-460 | Order |
| 25 HP | 89 CFM | 80 gal | 230V 3-PH | 970.2840-S | Order |
| 25 HP | 89 CFM | 80 gal | 460V 3-PH | 970.2840-460 | Order |
| 25 HP | 92 CFM | 120 gal | 230V 3-PH | 970.3904-0 | Order |
| 25 HP | 92 CFM | 120 gal | 460V 3-PH | 970.3904-460 | Order |
| 30 HP | 113 CFM | 120 gal | 230V 3-PH | 970.3907-0 | Order |
| 30 HP | 113 CFM | 120 gal | 460V 3-PH | 970.3907-460 | Order |
| 40 HP | 89 CFM | 80 gal | 230V 3-PH | 970.3233-S | Order |
| 40 HP | 89 CFM | 80 gal | 460V 3-PH | 970.3233-460 | Order |
| 40 HP | 150 CFM | 120 gal | 230V 3-PH | 970.3977-0 | Order |
| 40 HP | 150 CFM | 120 gal | 460V 3-PH | 970.3977- 460 | Order |
| 50 HP | 207 CFM | Base-mounted | 230V 3-PH | 970.3458-0 | Order |
| 50 HP | 207 CFM | Base-mounted | 460V 3-PH | 970.3458-460 | Order |
All models rated to 125 psig max working pressure. Available in 230V and 460V three-phase (and 230V single-phase on select 8 HP units). Call or text 586-210-0555 for a CET sizing match.
Why Buy From CET
The CET Difference
- Over 20 years supplying industrial compressed-air equipment — we match customers to the right compressor the first time.
- Real technical support before and after the sale — call or text 586-210-0555. For screw-compressor sizing and electrical, we recommend a quick call before ordering.
- Fast fulfillment and freight coordination — call or text 586-210-0555 to confirm availability and delivery.
- Complete air systems — we stock the matching dryers, filters, and tanks so your system is right the first time.
- The best order communication in the industry — updates at every step, and a heads-up in advance in the rare case of a delay.
Still Deciding
Not Sure Which Compressor Fits Your Shop?
Call before you order. CET’s technical team will confirm whether the 20 HP / 74 CFM model matches your air demand, duty cycle, and electrical service in a 5-minute call. Call or text 586-210-0555.
