| Capture of contaminated air |
| Type of mouth | Opening | Dimens. | Required flow |
 | GROOVE | H / L =0.2 | Q = 13.500 va Ld |
 | GROOVE with flange | H / L =0.2 | Q = 10.000 va Ld |
 | UNCOVERED RIM | H / L =0.2 | Q = 3600 va
(10 d² + S) |
 | RIM FLANGE | H / L =0.2 | Q = 2750 va
(10 d²+ S)
S= L+ H |
 | CABIN | In line with the function | Q = 3.600 va |
 | GROOVE | In line with the function | Q = 5.000 vaPD
P = Perimeter |
