User Manual

4
4" to 12" maximum
Indirect Connection - Breathing Tee
Indirect Connection - Return Air Grille
2. Types of Installation (continued)
Exhaust at the
source and supply
in the return
installation
This application uses a
devoted duct system for the
exhausting of stale air accumulated
in the home. The fresh air is dumped into
the return air duct and is distributed thru
the home by the existing supply air
ductwork of the forced air system.
Make sure when using this application that
your fresh air duct connection to the forced
air system return air duct is at least 3' from
the forced air system. You should check
with your local code or the forced air
system’s manufacturer.
Forced Air System
6'
18"
*For minimum distance between return and forced air
system, check with your local building codes and forced
air system manufacturer.
HRV/ERV
From Bathroom or
Kitchen
To living space
There are different practices used to combine HRV or ERV to a forced air system.
3'
Exhaust at the source
A Breathing Tee is a ventilation air supply
duct with an open tee located before the
connection to the return air duct. It allows
the HRV to function without supply air flow
rates being affected by the forced air
system’s fan speed.
Leaving a gap in the ventilation air supply
duct in place of the breather tee is
acceptable but not recommended.
With the return air grille approach, HRV or
ERV ventilation supply air is “dumped” near
a grille (between 4" and 12") in the return
air duct upstream of the recirculation fan.
*See your local code before making an installation.
INSTALLATION
GUIDE