LE6XRT ERV
19
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
UNIT PLACEMENT
6.0 INSTALLATION
6.2 DUCT CONNECTIONS
6.3 INDOOR SOUND ATTENUATION
6.1 ASSEMBLY OF MODULES
All duct connections to the sides of the unit are equipped with double-flanged duct connections. These
allow for connection of ductwork insulated on the inside or the outside, or for installation of lined ducts.
If the unit has factory-installed dampers on the sides of the unit, no duct flanges are provided at the
dampers. Ducts can be attached directly to the dampers.
Ducts inside a
building that are
connected to the
outside must be
insulated with a
sealed vapor barrier on both
the inside and the outside of
the insulation.
Duct stiffness:
Make sure the ductwork at the unit outlets is stiff enough to resist the flexing and resulting booming
noise associated with system start-up and shutdown, as well as the turbulent flow conditions at the
blower outlets.
In general, provide smooth transitions from the ERV outlets to the duct. The ducts connecting to the
outlets should be straight for a sufficient distance , with gradual transitions to the final duct size. These
guidelines are consistent with SMACNA recommended duct layout practices for efficient and quiet air
movement.
Radiated noise:
LE units are insulated with high density fiberglass. This provides significant attenuation of radiated
sound from the unit itself.
The outlet ducts can be significant sources of radiated sound, as well. The FA duct should be insulated
for sound control. This insulation should start at the unit. At a minimum, the first ten feet of duct should
be insulated. All parts of the FA and RA ducts located in a mechanical space with noise-generating
equipment should also be insulated for sound control, both to minimize sound radiation out of the FA
and RA ducts and also to control sound radiation into both ducts.
Many ERVs are ordered pre-assembled at the factory. For those units that are to be assembled in
the field, follow the assembly instructions found in the accompanying LE Models: Shipping, Rigging,
Lifting, Assembly manual, to be found in the documentation package shipped with each unit and
available online at
www.renewaire.com.
Double-Flange Duct Connection
