40 CFR Part 204, Appendix I
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Batch size | Code letter |
|---|---|
| 4 to 8 | A. |
| 9 to 15 | B. |
| 16 to 25 | C. |
| 26 and larger | D. |
| Sample size code letter | Test sample | Test sample size | Cumulative test sample size | Batch inspection criteria |
| Acceptance number | Rejection number |
| A | 1st | 4 | 4 | 0 | 1 |
| B | 1st | 3 | 3 | 0 | 1 |
| C | 1st | 3 | 3 | 0 | 2 |
| 2d | 3 | 6 | 1 | 2 | |
| D | 1st | 2 | 2 | (1) | 2 |
| 2d | 2 | 4 | (1) | 2 | |
| 3d | 2 | 6 | 0 | 2 | |
| 4th | 2 | 8 | 0 | 3 | |
| 5th | 2 | 10 | 1 | 3 | |
| 6th | 2 | 12 | 1 | 3 | |
| 7th | 2 | 14 | 2 | 3 |
1 Batch acceptance not permitted at this sample size.
| Sample size code letter | Number batches | Cumulative number batches | Sequence inspection criteria |
|---|---|---|---|
| Acceptance number | Rejection number | ||
| A | 2 | 2 | 1 | (1) |
| 2 | 4 | 2 | 4 | |
| 2 | 6 | 3 | 5 | |
| 2 | 8 | 4 | 5 | |
| B | 2 | 2 | 0 | (1) |
| 2 | 4 | 1 | 4 | |
| 2 | 6 | 2 | 5 | |
| 2 | 8 | 3 | 5 | |
| 2 | 10 | 4 | 6 | |
| 2 | 12 | 5 | 6 | |
| C | 2 | 2 | (2) | 2 |
| 2 | 4 | 0 | 2 | |
| 2 | 6 | 0 | 3 | |
| 2 | 8 | 1 | 3 | |
| 2 | 10 | 2 | 4 | |
| 2 | 12 | 3 | 4 | |
| D | 2 | 2 | 0 | 2 |
| 2 | 4 | 1 | 3 | |
| 2 | 6 | 2 | 4 | |
| 2 | 8 | 3 | 4 |
1 Batch sequence rejection not permitted for this number of batches.
2 Batch sequence acceptance not permitted for this number of batches.
| Test report number: | ||||
|---|---|---|---|---|
| Subject: | ||||
| Manufacturer: | Model: | Serial No.: | ||
| Rated speed: | Rpm: | Rated capacity: | | cfm (m3/in). | |
| Configuration identification: | Category identification: | |||
| Portable air compressor identification No.: | Build date: | |||
| Test conditions: |
Manufacturer's test site identification and location: |
Reflecting plane composition: |
| Operating speed as tested: | ||||
|---|---|---|---|---|
| Beginning of test | rpm | |||
| End of test | rpm | |||
| Air pressure supplied: | psi (kg/cm2) | Ambient wind speed______mph (km/hr) | ||
| Actual flow rate: | cfm (m3/min.) | Atmospheric pressure______psi (kg/cm2) | ||
| Temperature: | °F (°C) | |||
| Instrumentation: | ||||
| Microphone Manufacturer: | Model No.: | Serial No.: | ||
| Sound Level Meter Manufacturer: | Model No.: | Serial No.: | ||
| Calibrator Manufacturer: | Model No.: | Serial No.: | ||
| Other and Manufacturer: | Model No.: | Serial No.: | ||
| Data: | ||||
| Sound levels (decibels) | Background sound level at location 1 (decibels) | Location | ||
| 1 | 2 | 3 | 4 | 5 | Average sound level (decibels) |
| A-Weighted | | | | | |||
| Tested by: | Date: | |||
| Reported by: | Date: | |||
| Supervisory personnel: | Title: | |||
| | Title: | | |