Nu-Air Ventilation Systems Inc. - HRV Operating & Installation Manual
Rev. 3.4 Sept. 20, 2011 - 5 -
2. HOW THE NU-AIR SYSTEM WORKS
A. Powerful, centrifugal
blowers bring fresh air into
your home while an equal
amount of stale, humid air is
exhausted to the outside.
This is NU-AIR’s balanced
central ventilation system.
B. Incoming fresh air is filtered
before flowing through the
heat exchange core.
C. Stale, humid air flows
through the cross-flow heat
exchanger and transfers the
heat to the incoming fresh
air.
D. Warm fresh air is distributed to each room of the house through an independent ductwork system.
3. INSTALLATION
3.1. Installer's Responsibilities
Installers are responsible for the performance of the ventilation system and for ensuring that all codes
and standards are met.
Do not mount the fresh air supply near a source of contaminated air such as automotive exhaust, gas
or propane exhaust, garbage containers or oil tanks.
Do not connect a dryer exhaust to an HRV.
Combustion appliances such as furnaces and hot water heaters must not draw combustion air directly
from an HRV.
Do not connect a kitchen range hood to any part of this system.
Do not install in attics or other unconditioned spaces (min. 16º C).
Do not install in enclosed garages.
Try to maintain straight duct runs as much as possible, using as few joint fittings as possible.
Keep use of flexible ducting to a minimum.
Be sure to observe local codes regarding running and insulating ducts in unconditioned spaces.
Poorly insulated ducts run in unconditioned spaces will hamper the efficiency of the HRV.
Sizing the System
For residential applications you should have a minimum ventilation capacity of 10 cfm (5 L/s) per room.
The chart that accompanies the flow grid calibrates pressure readings to airflow. Refer to ASHRAE
Standard 62 for acceptable ventilation rates in commercial buildings.
Calculating TVC (Total ventilation Capacity) for Residential Applications:
• 20 cfm for the master bedroom
• 20 cfm for an unfinished basement
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