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Model PVe Heat Recovery Unit
When installed on a roof, a typical installation
will include at least one roof penetration in order
to deliver return air to the unit from the space.
Additionally, a second roof penetration may be used
for supply air discharge to the space.
Roof Curb and Rail Mounting
Service Clearances
Duct Dimensions
Position the unit roof opening such that the Return Air
Intake will line up with the corresponding ductwork.
If applicable, adjust position to also accommodate
the SA Discharge vent. Make certain that proposed
positioning of the unit still maintains recommended
service clearances.
Option Bottom Top Side End
OA Intake X
SA Discharge X X
RA Intake X
EA Discharge X
OA - Outdoor Air
SA - Supply Air (to the space)
RA - Return Air (from the space)
EA - Exhaust Air
Model A B C D E F
PVe-20
10.7
(280)
12.2
(310)
10.3
(270)
11.8
(300)
22.0
(570)
14.0
(360)
PVe-35
11.9
(310)
13.7
(350)
11.4
(290)
13.1
(340)
34.0
(870)
14.0
(360)
PVe-45
14.1
(360)
16.0
(410)
13.3
(340)
14.5
(370)
46.0
(1170)
14.0
(360)
PVe-55
16.4
(420)
19.2
(490)
15.9
(450)
18.6
(480)
60.0
(1530)
14.0
(360)
All dimensions are shown in inches (millimeters).
Intake and Discharge Options
Bypass
Damper
Face
Damper
Outdoor Air Hood
Filters
Filters
Filters
Exhaust
Air Hood
Control Center
Face/Bypass Damper
Plate Heat
Exchanger
Plate Heat
Exchanger
Outdoor
Air Hood
C
B
AD
E
CLEARANCE
CLEARANCE
B
C
A
D
D
OA Intake
RA Intake
SA Discharge
EA Discharge
B
A
C
D
E
F
Model A B C D
PVe-20
36
(920)
36
(920)
36
(920)
60
(1530)
PVe-35
48
(1220)
36
(920)
36
(920)
60
(1530)
PVe-45
60
(1530)
36
(920)
36
(920)
60
(1530)
PVe-55
72
(1830)
36
(920)
36
(920)
60
(1530)
All dimensions are shown in inches (millimeters). The
weatherhoods include 2-inch aluminum mesh filters that
are removed out of the end of the hood as shown in this
drawing and require extra clearance for removal.
Bypass
Damper
Face
Damper
Outdoor Air Hood
Filters
Filters
Filters
Exhaust
Air Hood
Control Center
Face/Bypass Damper
Plate Heat
Exchanger
Plate Heat
Exchanger
Outdoor
Air Hood
C
B
AD
E
CLEARANCE
CLEARANCE
B
C
A
D
D
Do not face the Outdoor Air Intake of the unit into
prevailing wind and also keep the air intake away
from any other exhaust fans. Likewise, position the
Exhaust Air Discharge opening away from any other
outdoor air intakes of other equipment.
When cutting duct openings, cut opening one inch
larger (25 mm) than duct size to allow clearance for
installation. Area enclosed by roof curb must comply
with clearance to combustible materials. If the roof
is constructed of combustible materials, area within
the roof curb must be ventilated, left open or covered
with non-combustible material which has an “R” value
of at least five (5). If area within curb is left open,
higher radiated sound levels may result.
Where the supply or warm air duct passes through
a combustible roof, a clearance of one inch must be
maintained between the outside edges of the duct
and combustible material in accordance with NFPA
Standard 90A.
SA Discharge