Specifications

Appendix C: Flow Measuring Station and Balancing Damper
Positions
Balancing damper
Flow measuring station (FMS)
Reverse door option
Min. 8” [203 mm]
Flexible duct connection
Fresh air
from outside
Exhaust air
from building
Min. 12”
[305 mm]
Min. 12”
[305 mm]
Notes:
1. The ‘exhaust air to outside’ duct is above the ‘supply air to space’ duct.
2. Straight duct sections minimum of 30” [762 mm] are required on supply to building and exhaust from the building to
achieve good airflow performance.
3. Flexbile duct connections, balancing damper and flow measuring stations are supplied and installed by others.
Supply air
to space
Exhaust air to outside
(see Notes below)
Flexible duct connection
Min. 30”
[762 mm]
Figure C1: HRV600i and HRV1200i flow measuring station and balancing damper positions
Flow measuring
station (FMS)
Defrost air opening
(see Note 4 below)
Min. 12”
[304 mm]
Exhaust air
from space
Min. 30”
[762 mm]
Min. 12”
[304 mm]
Flexible duct connection
Low voltage
terminal strips
Balancing damper
(not supplied)
Exhaust air
to outside
Supply air
to space
Notes:
1. The ‘fresh air from outside’ duct is above the ‘exhaust air from space’ duct.
2. Straight duct sections minimum of 30” [762 mm] are required on supply to building and exhaust from the building to
achieve good airflow performance.
3. Flexible duct connections, balancing damper and flow measuring stations are supplied and installed by others.
4. Air is drawn in to the defrost air opening on top of the unit for recirculation defrost from the space or room in which the
unit is mounted. If this air is not suitable for supply air or if a negative pressure is created and is not acceptable, then the
defrost air opening should be ducted to a branch from the return air duct or from a suitable space.
Figure C2: HRV700i flow measuring station and balancing damper positions
VCES-HRV-IOM-1C – HRV600i, HRV700i, HRV1200i
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