Castair 25 HP Rotary Screw Air Compressor — 105 CFM @ 100 PSI, 120 Gal ASME Tank, 100% Duty Cycle
The Castair 25 HP Rotary Screw Air Compressor is a 100% duty-cycle screw unit built to run all day, every day — no cool-down periods, no lockout codes, just power in, air out. It delivers 105 CFM at 100 PSI, and comes self-contained on a USA-made ASME-certified 120-gallon tank with the magnetic starter and controls already mounted and wired. Castair engineered this line to be the most user-friendly rotary screw on the market to install, operate, and maintain — one solenoid runs the air-end, with no computer to fault out. Built to order by Castair, a family-owned Minnesota manufacturer since 1991.
Why It's Different: The whole design philosophy is serviceable, off-the-shelf parts: standard V-belts with an adjustable tightener, spin-on oil and separator filters, automotive-type paper air filter, and copper air/oil lines you can source anywhere. A built-in air/oil separator, air-cooled aftercooler/oil cooler (removable for cleaning), easy-to-read pressure and temperature gauges, and an hour meter all come standard. High-pressure and dual high-temperature shutdowns protect the unit, and a 10-minute shutdown timer saves electricity when no air is being drawn. Heavy-duty industrial 1,725 RPM motors carry a full 15% service factor.
Best For: Industrial plants, large fabrication facilities, and operations with heavy, sustained air demand.
Configuration: Choose 230V or 460V three-phase power and vertical or horizontal tank orientation. All configurations deliver 105 CFM at 100 PSI. Selectable pressure: 135, 150, or 175 PSI (135 PSI standard).
⚠️ BEFORE YOU ORDER — PLEASE READ: This is a built-to-order industrial rotary screw compressor.
• Electrical: three-phase only — requires a dedicated 230V or 460V three-phase circuit (per your selected model), installed by a licensed electrician with proper grounding. Magnetic starter comes mounted and wired — just connect power.
• Lead time: all Castair units are built to order — confirm current production lead time before purchase.
• Weight & placement: approx. 1,045 lb; requires a level floor, adequate ventilation for heat dissipation, and freight handling for delivery.
It is the customer's responsibility to verify electrical service, floor space, and ventilation before purchase and installation.
Features
-
100% duty cycle — runs continuously with no required cool-down
-
105 CFM @ 100 PSI rated output
-
Self-contained on a USA-made ASME-certified 120-gal tank — no separate water separator or tank plumbing needed
-
Magnetic starter & controls mounted and wired — just connect power
-
One solenoid operates the air-end — no computers, no lockout codes
-
Selectable pressure: 135 / 150 / 175 PSI (135 PSI standard)
-
Built-in air/oil separator with spin-on filter
-
Air-cooled aftercooler / oil cooler standard — removable for easy cleaning
- Pressure & temperature gauges, hour meter standard
-
High-pressure + dual high-temperature shutdown protection
-
10-minute shutdown timer saves electricity when air isn't needed
-
Heavy-duty industrial 1,725 RPM motor with full 15% service factor
-
Off-the-shelf serviceable parts — standard V-belts, spin-on filters, copper lines
-
Factory-filled synthetic lubricant (4,000 hours / 1 year)
-
2-year warranty on air-end, electric motor & tank
Specifications & Model Guide
| Castair Rotary Screw 25 HP — 105 CFM @ 100 PSI (Three-Phase) |
| Model |
Voltage |
Orientation |
Tank (Gal) |
L × W × H (in) |
Wt (lb) |
| R25312VG30-230 |
230V |
Vertical |
120 |
44 × 32 × 73 |
1,045 |
| R25312VG30-460 |
460V |
Vertical |
120 |
44 × 32 × 73 |
1,045 |
| R25312HG30-230 |
230V |
Horizontal |
120 |
69 × 33 × 55 |
1,045 |
| R25312HG30-460 |
460V |
Horizontal |
120 |
69 × 33 × 55 |
1,045 |
| Shared Specifications |
| Manufacturer |
Castair (Spicer, Minnesota — family-owned since 1991) |
| Type |
Rotary screw air compressor, 100% duty cycle, ASME tank |
| Total HP |
25 HP |
| Output |
105 CFM @ 100 PSI |
| Pressure |
Selectable 135 / 150 / 175 PSI (135 standard) |
| Motor |
Industrial 1,725 RPM, 15% service factor |
| Phase / Voltage |
Three-phase; 230V or 460V |
| Tank |
120 gal, ASME-certified (USA-made), vertical or horizontal |
| Lubricant |
Factory-filled synthetic, 4,000 hr / 1 yr |
| Warranty |
2 years on air-end, electric motor & tank |
| Certification |
ASME-certified air receiver tank |
| Brand |
Castair |
What's Included
- Rotary screw compressor self-contained on a USA-made ASME tank
- Magnetic motor starter & controls — mounted and wired
- Built-in air/oil separator, air-cooled aftercooler/oil cooler
- Pressure & temperature gauges, hour meter
- Factory-filled synthetic lubricant (4,000 hr / 1 yr)
- (Factory-mounted options available — electronic auto tank drain, vibration pads. Preventative-maintenance kits, ball valves & metal flex lines also available. Contact us to configure.)
Manuals & Documentation