Page 13
Healthy Climate
®
HRV/ERV Ventilators
Installation Methods
There are three methods of installation for the HRV
/
ERV:
S
Simplified installation (Page 14)
S
Partially dedicated installation (Page 15)
S
Fully dedicated installation (Page 16)
Sizing the Ductwork
The installer must ensure all ductwork is sized and
installed as designed to ensure the system will perform as
intended.
The amount of air (cfm) that the HRV
/
ERV unit will deliver
is directly related to the total external static pressure
(E.S.P.) of the system. Static pressure is a measure of re-
sistance imposed on the blower by length of ductwork plus
the number of fittings used in the ductwork.
Installing Ducting Between the HRV/ERV Unit
and Living Areas in the House
A well designed and installed ducting system will allow the
HRV
/
ERV to operate at its maximum efficiency.
All ducts should be kept short and have as few bends or
elbows as possible to maximize airflow. Forty-five degree
elbows are preferred to 90º elbows. Use Y" tees instead of
straight tees whenever possible.
All duct joints must be fastened with screws, rivets or duct
sealant and wrapped with mastic or quality duct tape to
prevent leakage. Mastic is preferred but if duct tape is used
it should be the aluminum foil type.
Galvanized (rigid) ducting from the HRV
/
ERV to the living
areas in the house is recommended whenever possible al-
though flexible duct can be used in moderation, if neces-
sary.
A short length (approximately 12" [300mm]) of non-metal-
lic flexible insulated duct should be connected between the
HRV
/
ERV and the supply/exhaust duct system to avoid
possible noise transfer through the duct system.
All ducts running through attics and unheated spaces must
be sealed and insulated to code.
IMPORTANT
Applications such as greenhouses, atriums, swim-
ming pools, saunas, etc. have unique ventilation re-
quirements which should be addressed with an iso-
lated ventilation system.
