Heavy - (of slumber) deep and complete; "a heavy snooze"; "fell into a profound sleep"; "a sound sleeper"; "deep wakeless rest" Wall and roof-mounted dampers are placed on mechanical HVAC air flow methods. Typically used in airflow Management in air flow systems possibly to modulate airflow or as being a https://dampers-for-industrial-se90122.tusblogos.com/37382130/the-definitive-guide-to-dampers-for-industrial-sector