Rinnai 27
Ducted Gas Heater IM
Table 6. Outlet Register Chart
System Model
Airflow Rate
(L/s)
A
B
C
D
Maximum No.
Ceiling Outlets
Typical No.
Floor Outlets
Minimum No.
Floor/Ceiling
Outlets
(Adaptive Zoning)
Minimum No.
Floor/Ceiling Outlets
SP4 Heaters – Universal
SP415UN
620
10
12
6
2
SP421UN
621
10
12
6
2
SP430UN
918
16
23
7
2
SP435UN
1004
17
23
7
3
BX5 Heaters – External
BX520EN (300mm)**
605
10
12
5
2
BX520EN (350mm)**
667
12
13
6
2
BX526EN (350mm)**
944
16
23
7
2
BX526EN (400mm)**
1011
17
23
7
3
** Model and base-box duct size
NOTE
For SP4UN installations, the normal return air pop configuration is side entry, but can be
changed to the end of the fan cabinet if necessary. Connecting the return air duct to the end of
the unit reduces the rated airflow by up to 30%.
DUCTING AND OUTLETS
