Install Master Flow 4 in. Dampers (6-Pack) in individual runs of round pipe in an HVAC system (each sold separately) to balance and adjust the flow of air. These dampers include spring-loaded hardware and are constructed from galvanized steel to provide durability.

Install Master Flow 4 in. Dampers (6-Pack) in individual runs of round pipe in an HVAC system (each sold separately) to balance and adjust the flow of air. These dampers include spring-loaded hardware and are constructed from galvanized steel to provide durability.