ProFix come in a variety of sizes based on airflow requirements. The sizing listed to the right is Keller standard; if additional sizes are required, please consult with your local Keller representative.
| Switch size | NW [in] | Length [mm] | Measurement range [cfm] | Measurement range with 10 % control tolerance [cfm] |
|---|---|---|---|---|
| ProFix125 | 5 | 25.6 | 85 - 580 | 300 - 580 |
| ProFix140 | 5.5 | 25.6 | 150 - 700 | 350 700 |
| ProFix160 | 6 | 25.6 | 200 - 950 | 470 - 950 |
| ProFix180 | 7 | 25.6 | 235 - 1,175 | 580 - 1,175 |
| ProFix200 | 8 | 29.6 | 300 - 1,470 | 735 - 1,470 |
| ProFix224 | 9 | 29.6 | 380 - 1,880 | 950 - 1,880 |
| ProFix250 | 10 | 29.5 | 470 - 2,350 | 1,175 - 2,350 |
| ProFix280 | 11 | 29.5 | 580 - 3,000 | 1,470 - 3,000 |
