A bullnose tee makes return air streams collide and howl
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.
Do not assume a fitting is good just because the metal fits
the air path still has to make sense.
Check
Identify airflow direction through both branches and the main.
Listen/feel for noise at the collision point and check whether TAB is reporting unstable readings.
Confirm whether the installed fitting matches the drawing and approved detail.
Measure available space for a smoother fitting, splitter/divider vane, or modified transition.
Get approval before cutting apart a main fitting because it affects airflow and balance.
Steps
Identify airflow direction through both branches and the main.
Listen/feel for noise at the collision point and check whether TAB is reporting unstable readings.
Confirm whether the installed fitting matches the drawing and approved detail.
Measure available space for a smoother fitting, splitter/divider vane, or modified transition.
Get approval before cutting apart a main fitting because it affects airflow and balance.
Say this to your foreman
The bullnose tee at [location] has opposing air streams crashing into each other. I checked airflow direction and space. Do you want a splitter/divider vane or a revised transition detail?