Castair Air Compressors

Castair Air Compressors Castair, Inc., based in Spicer, MN, is a trusted manufacturer of high-quality slow-rpm air compressors since 1991. In Floor Heating
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Specializing in industrial and gas-powered reciprocating and rotary screw compressors.

03/24/2026

New product alert for Contractors, HVAC, rental and roofer customers. Higher CFM air compressors on 110volt power.

"Team up strong with our friends at Auto Value Parts Stores! We're live and loaded at the North American Farm & Power ...
03/19/2026

"Team up strong with our friends at Auto Value Parts Stores! We're live and loaded at the North American Farm & Power Show TODAY, TOMORROW, and SATURDAY (9 AM - 5 PM) – come see why CASTAIR Air Compressors are the go-to for pros who demand cast iron durability, quiet operation, and long-haul reliability. Paired perfectly with top-shelf WIX Filters, genuine Auto Value parts, and Milwaukee Tool power – it's the ultimate shop upgrade spot!

" Power up your shop, garage, or ranch with CASTAIR Air Compressors – now in stock at all Shipton's Big R locations! Th...
03/09/2026

" Power up your shop, garage, or ranch with CASTAIR Air Compressors – now in stock at all Shipton's Big R locations! These heavy-duty beasts are built with all cast iron construction for long-lasting performance, slow RPM for super-quiet operation, oil-lubricated reliability, and industrial-grade components that stand up to tough jobs. From the popular Garage Series 20-Gallon 2HP models to Commercial Two-Stage units and bigger industrial options – they've got the power you need without the noise or breakdowns. Whether you're running tools, inflating, painting, or handling farm/ranch work, CASTAIR delivers dependable air every time! Stop by your nearest Shipton's Big R today:
Billings (East, West, Heights)
Lewistown
Hardin
Sheridan, WY Don't wait – stock is moving fast!

🚀 Introducing the G212P50VP: The Powerhouse of Our Garage Series! 🚀Meet the G212P50VP, our most popular garage series co...
03/09/2026

🚀 Introducing the G212P50VP: The Powerhouse of Our Garage Series! 🚀

Meet the G212P50VP, our most popular garage series compressor! Designed for both professionals and DIY enthusiasts, this compressor is the largest you can run on a standard 115-volt plug, making it perfect for any garage setup.

Is moisture killing your pneumatic tools & raising downtime? Our Refrigerated Compressed Air Dryers keep air dry & syste...
03/07/2026

Is moisture killing your pneumatic tools & raising downtime? Our Refrigerated Compressed Air Dryers keep air dry & systems running smooth. Reliable. Efficient. Affordable.

Good morning from CASTAIR! Check out our HYBRID series for your variable air needs.
03/07/2026

Good morning from CASTAIR! Check out our HYBRID series for your variable air needs.

Here's the key technical data on how **elevation (altitude)** affects **compressed air** in an **air compressor**. Th...
03/06/2026



Here's the key technical data on how **elevation (altitude)** affects **compressed air** in an **air compressor**. This is based on physics (ideal gas law, air density changes) and industry standards from compressor manufacturers.

# # # Main Effects of Higher Elevation
As you go up in altitude, **atmospheric pressure decreases**, which directly lowers **air density** (fewer air molecules per cubic foot). Air compressors (reciprocating, rotary screw, etc.) draw in a **fixed volume** of air per cycle, but with thinner air, they intake **fewer molecules** (less mass of air).

Key impacts:
- **Reduced output flow (CFM / SCFM)**: The compressor delivers **less usable compressed air** (mass flow) at the same pressure.
- **Slightly reduced discharge pressure capability** (if not adjusted): Higher compression ratios needed to reach the same PSI, which can stress components.
- **Engine/motor derating** (for gas/diesel models): Less oxygen = less power (about 3% horsepower loss per 1,000 ft).
- **Increased heat & strain**: Thinner air = poorer cooling; compressor works harder → higher temps, potential overheating, reduced efficiency/lifespan.
- **No major change to final compressed air quality** (once compressed, moisture/oil issues depend more on dryer/filtration), but overall system performance drops.

- **~3% reduction in capacity (CFM)** per **1,000 feet** above sea level.
- This is roughly linear and tied to the drop in atmospheric pressure/density.

More precise: Use the ratio of absolute pressures (since density ∝ pressure at constant temp).

- Sea level: ~14.7 psia (pounds per square inch absolute)
- Formula for approximate CFM adjustment:
**CFM at altitude ≈ Rated CFM × (Altitude pressure / 14.7 psia)**

Examples (approximate, assuming constant temp; real-world varies slightly by model/temp/humidity):

| Elevation (ft) | Approx. Atmospheric Pressure (psia) | % of Sea Level Density/Pressure | Expected CFM Output (vs. Sea Level Rating) | Example: 100 CFM @ Sea Level → Output at Altitude

- At 5,000 ft (mile-high city), expect ~15–17% less air output.
- Manufacturers often provide specific **derating tables/factors** for their models (e.g., rotary screw might lose less than single-stage reciprocating due to design).

# # # Other Notes
- **SCFM vs. ACFM**: Ratings are often in ACFM (actual cubic feet per minute at intake conditions). At altitude, to get the same **SCFM** (standard/sea-level equivalent mass flow), you need a **larger compressor** (e.g., oversize by 20%+ at high elevations).
- **Electric vs. Gas/Diesel**: Electric motors lose less directly (no oxygen dependency), but still see flow reduction from lower density. Gas engines derate ~3% HP per 1,000 ft.
- **Solutions for High-Altitude Use**:
- Oversize the compressor (e.g., select one rated higher at sea level).

This is why shops in mountainous areas (Rockies, etc.) often need bigger units or accept lower performance. If you're sizing a CASTAIR compressor for a specific elevation (e.g., dairy farm in Colorado), share the feet above sea level + required CFM/PSI, and I can help calculate a rough adjustment! 🚀

Power Your Productivity! 💪 Discover how industrial-grade compressors from CASTAIR, INC can enhance efficiency and reliab...
03/05/2026

Power Your Productivity! 💪 Discover how industrial-grade compressors from CASTAIR, INC can enhance efficiency and reliability in your operations. Invest in quality, and watch your workplace thrive!

Happy Friday from CASTAIR Air Compressors! Kick off your weekend right with reliable, heavy-duty power from the I718VC...
02/27/2026

Happy Friday from CASTAIR Air Compressors! Kick off your weekend right with reliable, heavy-duty power from the I718VC1-S – our top-rated 7.5 HP industrial vertical air compressor that's built to last!
80-gallon vertical ASME tank
24.8 CFM @ 175 PSI (32.4 CFM @ 0 PSI) for serious shop performance
All cast iron 2-stage pump, slow RPM design for quieter operation & longer life
Powder-coated tank, fully enclosed metal belt guard, and MADE IN THE USA quality

Whether you're tackling automotive work, manufacturing, or heavy-duty garage projects, the CASTAIR I718VC1-S delivers consistent, high-volume compressed air without breaking a sweat. Power up your productivity this Friday – and every day! Tag a shop buddy who needs this beast in their lineup!

A couple MORE TRUCKLOADs of premium CASTAIR industrial air compressors just tested, wrapped, and ready to ship! From hea...
02/12/2026

A couple MORE TRUCKLOADs of premium CASTAIR industrial air compressors just tested, wrapped, and ready to ship! From heavy-duty piston to reliable rotary screw units – we're moving serious volume to shops, factories, and job sites nationwide. Built in the USA for maximum durability, efficiency, and uptime. Whether you're outfitting a new facility, expanding your fleet, or stocking up for peak season – CASTAIR delivers truckloads of performance you can count on. Who's ready to power up?

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Castair Distributors — Our 2026 List Price Schedule is now available. If you're currently stocking or quoting Castair ...
02/11/2026

Castair Distributors — Our 2026 List Price Schedule is now available. If you're currently stocking or quoting Castair air compressors and need the updated pricing, please reach out. DM us here, comment below, or contact your rep directly to request your copy. Thank you for partnering with us.

Address

8894 47th Street NE
Spicer, MN
56288

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

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