Air Diffusers with OBD vs Without OBD – Pros & Cons 1. Introduction In HVAC systems, the airflow control damper (OBD – Opposed Blade Damper) is an important accessory typically installed behind air diffusers. However, not all systems require an OBD. So, what are the differences between diffusers with and without OBD? 2. What is …
Top quality











