How to perfectly install Ventman ventilation frameless circle diffusers in gypsum ceilings Installing ventilation correctly is just as important as choosing the right product. In this video, we show how to perfectly install Ventmann frameless circle diffusers into gypsum ceilings, ensuring a flawless architectural finish and optimal airflow performance. Ventmann circle diffusers are designed to be plaster-in and frame-free, allowing them to integrate directly into gypsum ceilings as part of the