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C. indoor-air (conditioned supply air) system, Return air options, Indoor fan performance – Friedrich 18000 B User Manual

Page 11: Front free, Table 2

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11

C. Indoor-Air (Conditioned Supply Air) System

The VEB/VHB series unit may be applied in either a free return air configuration or a ducted return air configuration. The supply
air path is intended to be ducted. The design and construction of the 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 capabilities of the system
at the design airflow (See Table 2).

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.

Return Air Options

Front Free

Front Free

Front Free

Front Free

Front Free

Return

Return

Return

Return

Return

Side Ducted

Return

Front Ducted

Return

Figure 10

NOTE: Ducted return air configurations require field fabrication of a duct-mounted filter box. Filters are not
supplied with units configured for ducted return.

Indoor Fan Performance

Table 2

Indoor Blower Air Flow, SCFM (ARI RATED as shown)

Model

ESP

0.1

0.2

0.3

0.4

0.5

VE/HB18

Indoor

850

750

640

550

450

250

VE/HB24

Indoor

980

890

800

720

650

300

VE/HB30

Indoor

1120

1070

1000

940

830

375

VE/HB36

Indoor

1220

1120

1050

990

860

400

VE/HB42

Indoor

1570

1510

1470

1400

1350

525

VE/HB49

Indoor

1670

1610

1570

1500

1450

525

VE/HB60

Indoor

1980

1920

1860

1800

1700

675

Note:

Italic

indicates performance outside the required operating window of +/- 10% of rated SCFM. All values are wet

coil with filter installed.

RA Grille Minimum Net

Free Open Area (Sq. In.)

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