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C. Indoor-Air
(Conditioned
Supply
Air)
System
The VEB/VHB series unit may be applied in either a free return air configuration ora ducted return air configuration. The supply
air path is intended to be ducted. The design and construction ofthe indoor-air system must provide adequate air distribution
to ensure comfort levels throughout the structure.
The combined pressure losses of the return and supply air paths must not exceed the external static ca pabilities of the system
at the design airflow (See Table 2 below).
If the unit is installed in a closet behind a door and the return air louver or grille is directly opposite the unit RA opening, 2-
in. clearance is required between the front of the unit and the back side of the louver or grille. If the louver or grille is located
elsewhere on the door so it is not directly in front of the RA opening, a minimum of 7-in. clearance is required between the
front of the unit and the back side of the door. The minimum "net free open area" required for the RA louver or grille is listed
in Table 2.
Indoor
Fan Performance
Table
2
ESP
Rated
0.1"
0.2"
0.3"
0.4"
0.5"
VEB18 / VHB18
VEB24 / VHB24
VEB30 / VHB30
VEB36 / VHB36
VEB42 / VHB42
VEB49 / VHB49
VEB60 / VHB60
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
630
800
1000
1120
1400
1500
1800
85O
89O
1070
1220
1610
1610
2040
75O
8OO
1000
1120
1570
1570
1980
63O
720
94O
1050
1510
1510
1900
55O
650
830
990
1470
1470
1800
450
54O
720
86O
1400
1400
1750
IRA Grille Minimum Net
Free Open Area (Sq. In.)
25O
3OO
375
4OO
525
525
675
Italics numbers indicate
performance
outside the required operating window.
Bold figures indicate the standard
rated airflow.
Indoor Airflow values were measured
with wet coil.
Figure
10
Return
Air Options
Front
Free
Return
Front
Ducted
Return
NOTE: Ducted return air configuration requires field fabrication of a duct-mounted filter box.
11
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