TinnerFlow™3rd YearAirflow / FittingsYELLOW · Check First
Opposing air streams crashing into a flat tee can create turbulence, noise, and static problems. The fix is usually a revised fitting, splitter/divider vane, or smoother Y-style transition approved by layout/detailing.
A bullnose tee can be a problem when two return or supply streams hit each other head-on. The duct may be installed neatly, but the air path is fighting itself.
Check whether the fitting is causing noise, static spike, or bad TAB readings. Bring the foreman/detailer a field sketch and options such as a splitter/divider vane, turning help, or a revised Y/pant-leg style fitting so both air streams enter in a smoother direction.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.