Use the delivery line, not maximum PSI

Maximum PSI does not tell you how many cubic feet per minute a compressor publishes at a tool's operating pressure. They are separate fields. For an Air Tool Match comparison, the relevant compressor entry is a delivery figure such as 4.0 CFM at 90 PSI, not a headline such as 200 max PSI.

Three manufacturer pages make the distinction visible:

Compressor Published maximum pressure Published delivery at 90 PSI
California Air Tools 8010 120 PSI 2.20 CFM
Metabo HPT EC914S 200 PSI 4.0 CFM
Campbell Hausfeld VT6271 135 PSI 10.2 CFM

The Metabo HPT has the highest maximum pressure here at 200 PSI, but publishes 4.0 CFM at 90 PSI. The Campbell Hausfeld reaches 135 PSI and publishes 10.2 CFM at 90 PSI, more than double the airflow. On these three pages, the pressure headline does not tell you which model moves more air at 90 PSI.

What maximum PSI says

Maximum PSI is a pressure specification. On the California Air Tools 8010 page, the manufacturer publishes 120 PSI Maximum Pressure. The same page separately publishes 3.10 CFM @ 40 PSI and 2.20 CFM @ 90 PSI.

The Metabo HPT EC914S page follows the same pattern. Its specification table gives a maximum pressure of 200 PSI, then lists air delivery as 5.1 CFM at 40 PSI and 4.0 CFM at 90 PSI.

On the Campbell Hausfeld VT6271 page, maximum pressure is 135 PSI. The page gives compressor output in different fields: 11.5 CFM at 40 PSI and 10.2 CFM at 90 PSI.

Each page keeps pressure capacity and airflow delivery separate. Air Tool Match does the same.

What a delivery-at-pressure line says

A delivery line joins a flow value to a stated pressure condition. That pair can be read beside a tool figure only when the tool's publication uses the same pressure and the stored labels pass the site's comparison rule.

Suppose a tool page publishes:

Average Air Consumption: 4.2 CFM at 90 PSI

The Metabo HPT page supplies two other numbers that may catch the eye:

Maximum pressure: 200 PSI
Air delivery: 4.0 CFM at 90 PSI

Only the second entry shares the shape of the tool record. It is airflow at 90 PSI. The 200 PSI field is not a flow value, so subtracting 4.2 CFM from 200 PSI would mix different quantities and produce nonsense.

The units expose the error. CFM describes volume per unit time. PSI describes pressure. A page may display both prominently, but prominence does not make them interchangeable.

Higher maximum pressure does not settle the CFM comparison

The three verified pages are useful because their order changes depending on which column you read.

By maximum pressure, the order is:

  1. Metabo HPT EC914S: 200 PSI.
  2. Campbell Hausfeld VT6271: 135 PSI.
  3. California Air Tools 8010: 120 PSI.

By published delivery at 90 PSI, the order is:

  1. Campbell Hausfeld VT6271: 10.2 CFM.
  2. Metabo HPT EC914S: 4.0 CFM.
  3. California Air Tools 8010: 2.20 CFM.

That reversal is not a buying recommendation. The products differ in far more than these fields, and the table does not account for receiver size, duty cycle, recovery, power supply, configuration, or intended use. It demonstrates one thing: sorting by maximum PSI does not reproduce the published 90 PSI delivery order on these pages.

Why product cards make the mix-up easy

Retail listings and manufacturer summaries often have limited space. A large maximum-pressure number can appear near a tank size, horsepower description, or marketing name, while the delivery figures sit farther down in a specification table. A reader scanning the headline can copy the wrong field before reaching the rows that contain CFM.

Use a repeatable check:

  1. Find the exact model number.
  2. Search the manufacturer page for CFM, SCFM, air delivery, performance, or 90 PSI.
  3. Record the complete delivery label, value, unit, and pressure.
  4. Save maximum PSI in a separate field if you need it for another purpose.
  5. Do not substitute maximum PSI when the delivery line is missing.

The final step matters. A missing CFM-at-pressure entry is an absence, not an invitation to estimate it from tank capacity, horsepower, or maximum pressure.

Why 40 PSI and 90 PSI remain separate

All three source pages publish a higher CFM figure at 40 PSI than at 90 PSI for the same model. The value belongs with its row. Air Tool Match does not lift the larger 40 PSI value and use it against a tool figure published at 90 PSI.

For the California Air Tools 8010, the page shows:

3.10 CFM at 40 PSI
2.20 CFM at 90 PSI

A note that says only 3.10 CFM has already lost a condition that changes its meaning. The guide on why compressor CFM changes at 40 and 90 PSI covers that reading problem in detail.

What this comparison cannot establish

A delivery figure on a product page is not a measurement of the air reaching a particular tool in a particular shop. This article does not calculate compressor size, operating reserve, recovery time, receiver adequacy, duty cycle, regulator settings, hose loss, simultaneous demand, electrical suitability, installation requirements, or pressure safety.

It also does not decide that one compressor can run a specific tool. Air Tool Match places two compatible published figures on one scale and shows the arithmetic. Real equipment selection includes conditions the current records do not contain.

For a purchase, installation, or operating decision, take the exact tool model, compressor model, duty pattern, and site conditions to the manufacturers or a qualified professional.

Check the field before using the matcher

Open the compressor's manufacturer page and locate the delivery line tied to the same pressure as the tool record. If the page provides only maximum PSI, tank capacity, horsepower, or a delivery value without a pressure condition, the current site does not have enough information for its comparison.

You can inspect every stored compressor label in the records directory before returning to the matcher.

Sources checked

Checked 2026-09-28. Manufacturer pages can change; each stored record retains its own checked date.