Heavy - marked by wonderful psychological excess weight; weighted down In particular with sadness or difficulties or weariness; "a heavy heart"; "a heavy agenda"; "heavy information"; "a heavy silence"; "heavy eyelids" Wall and roof-mounted dampers are placed on mechanical HVAC air flow systems. Normally Employed in airflow Manage in air https://heavydutystainlesssteelda79901.blogdosaga.com/36752233/heavy-duty-stainless-steel-damper-manufacturers-an-overview