4.0 Outlet Guide
The outlet chart provides recommendations based on using the Brivis "SuperSizeGuide" or a system designed using
accepted design principles. These figures also relate to typical size registers and diffusers used on domestic heating
systems i.e. 300mm x 100mm floor registers and 150mm round ceiling diffusers, with 150mm ductwork connection.
For all systems, a minimum number of outlets must remain fully open (this includes both the outlet grille and the
damper in the duct) if the heater is to operate properly without overheating. Similarly, ceiling outlet systems have a
maximum number of outlets that can remain fully open, to ensure that the velocity through each outlet is sufficient.
These maximum ceiling outlet figures relate to fully open outlets, however, the system will operate efficiently with more
outlets open, if it has been properly balanced. There is no maximum number for floor outlets, so the following chart
below lists the typical number of floor outlets for each heater model.
The outlet chart has been divided up into three columns as follows:
A. The maximum number of outlets that should remain fully open for a ceiling outlet system
B. The typical number of outlets for a floor outlet system
C. The minimum number of outlets that should remain fully open for floor/ceiling systems
Table 3: Outlet register chart
Model
Airflow
Rate
(l/s)
A
Maximum
Ceiling
B
Typical
Floor
C
Minimum
Floor/Ceiling
CC315
540 10 9 5
CC320
540 10 9 5
CC320XA
625 11 10 6
CC325
600 11 10 6
CC325XA
680 12 11 7
CC330
920 13 16 8
CC330XA
980 14 16 8
Note: Airflow figures are based on the maximum fan speed setting at total static pressure of 50Pa for
15, 20 & 25 kW models, 125Pa for the 30kW model.
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