The following table lists the recommended orifice diameters, associated flow rate ranges, and canister volumes and sampling times:
| Canister Volume/Sampling Time | Orifice | Siltek-Treated | Stainless Steel | |||||
| 400 cc | 1 Liter | 3 Liter | 6 Liter | 15 Liter | Flow | Size | cat.# | cat.# |
| 8 hour | 24 hour | 48 hour | 125 hour | — | 0.5–2 mL/min | 0.0008″ | 24217 | 24216 |
| 2 hour | 4 hour | 12 hour | 24 hour | 60 hour | 2–4 mL/min | 0.0012″ | 24160 | 24165 |
| 1 hour | 2 hour | 6 hour | 12 hour | 30 hour | 4–8 mL/min | 0.0016″ | 24161 | 24166 |
| — | 1 hour | 4 hour | 8 hour | 20 hour | 8–15 mL/min | 0.0020″ | 24162 | 24167 |
| — | — | 2 hour | 3 hour | 8 hour | 15–30 mL/min | 0.0030″ | 24163 | — |
| — | — | 1 hour | 1.5 hour | 4 hour | 30–80 mL/min | 0.0060″ | 24164 | 24169 |
| — | — | — | 0.5 hour | 1 hour | 80–340 mL/min | 0.0090″ | 22101 | — |
