Question 1

How do I size an industrial air compressor?

Accepted Answer

Size a compressor by the total CFM (cubic feet per minute) your tools and equipment require at their operating PSI, then add roughly 30% headroom for future growth and to avoid running the unit at 100% duty. Add the CFM of every tool that may run simultaneously, match the required pressure (most shop applications run 90-125 PSI), and confirm your available electrical supply (voltage and phase). A1 Compressor Warehouse offers free sizing support to match the right compressor to your application.

Question 2

What is the difference between oil-free and oil-lubricated air compressors?

Accepted Answer

Oil-lubricated compressors use oil to lubricate and seal the compression element, offering long life and lower cost for general industrial use, but they require oil changes and can carry trace oil into the air. Oil-free compressors deliver Class 0 air with no oil in the airstream, which is essential for medical, dental, food, electronics, and pharmaceutical applications where any oil contamination is unacceptable. Anest Iwata oil-free scroll compressors are a common choice for these clean-air needs.

Question 3

What size air compressor do I need for air tools?

Accepted Answer

Check the CFM requirement for each air tool and add the CFM of all tools that will run at once, then add about 30% headroom. Light tools like impact wrenches need 3-5 CFM, while continuous-demand tools like sanders or grinders can need 8-12 CFM or more. For most professional shops a two-stage compressor in the 5-10 HP range covers a single-bay operation; larger shops and production lines typically move to rotary screw compressors for continuous duty.

Question 4

Is A1 Compressor Warehouse an authorized dealer?

Accepted Answer

Yes. A1 Compressor Warehouse is an authorized dealer for Atlas Copco, Anest Iwata, Mattei, Schulz, and EL-AV. Every product ships with genuine OEM parts and full manufacturer warranty. We serve customers nationwide with fast US shipping and provide service in the Carolinas.

Question 5

What is the difference between a rotary screw and a reciprocating air compressor?

Accepted Answer

Reciprocating (piston) compressors are ideal for intermittent use and lower-duty applications, delivering high pressure at a lower upfront cost. Rotary screw compressors are built for continuous duty, running cooler and quieter with steadier air delivery, which makes them the standard for shops and plants that use air throughout the day. Variable-speed (VSD) rotary screw models further cut energy costs by matching output to demand.

Question 6

Do air compressors come with a warranty and shipping?

Accepted Answer

Yes. All compressors sold by A1 Compressor Warehouse include the full manufacturer warranty and genuine OEM parts. We ship nationwide across the United States, offer same-day quotes, and provide expert sizing support to help you select the right unit before you buy.

Model	QAS 25 ID T4F NB
Atlas Copco Part Number	8972823120
Type	Mobile Diesel Generator
Tier Rating	T4F
Nominal Power	20/25 kVA
Peak Power	N/A kVA
Voltage	480/240/208/120 V
Frequency	60 Hz
Sockets	2 x NEMA 5-20R GFCI & 2 x 125/250V 50A CS6369
Engine	Isuzu 4LE2T Diesel
Engine Output	30 kW
Engine Displacement	2200 cm³
Fuel Tank Capacity	75 gal
Fuel Autonomy (at nom. load)	48.2 h
Sound Pressure (LpA @ 7 m)	67 dB(A)
Sound Power (LwA)	N/A dB(A)
Dimensions (L × W × H)	129 L × 54 W × 66 H in
Weight	2565 lb
Warranty	12 months from start-up / 18 months from receipt (whichever comes first)

Brand	Atlas Copco
Model #	QAS 25 ID T4F NB
Mfr Part #	8972823120
Horsepower	20/25 kVA
CFM	2200 cm³
Max Pressure	67 dB(A)
Tank Size	75 gal
Voltage	480/240/208/120 V
Noise	67 dB(A)
Weight	2565 lb
Dimensions	129 L × 54 W × 66 H in
Warranty	12 months from start-up / 18 months from receipt (whichever comes first)

Atlas Copco QAS 25 ID T4F NB Mobile Diesel Generator

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