advanced flue system allows preheated air
(replacement volume) to enter the room via the primary casing vent.
addition to the DraftMaster (anti downdraft) Terminal, the system
also incorporates an adjustable vent
within the ceiling manifold to control the air flow between the primary
casing and active flue.
secondary casing allows the active flue to retain a high heat level
to ensure efficient discharge of smoke gases.