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16
HE-Series Indoor
ERV
INSTALLATION
4.3 SOUND ATTENUATION
Take these simple steps to attenuate noise from the unit.
4.3.1 Outside the Building
The exhaust hood is the primary source of noise outside the building. When practical, orient the
exhaust air hood to point away from houses or public areas.
4.3.2 Ducts
Make sure the ductwork at the unit outlets is stiff enough to resist the flexure and resulting
booming associated with system start-up and shut-off, as well as the turbulent flow conditions
at the blower outlets.
In general, provide smooth transitions from the ERV’s 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. Follow SMACNA guidelines.
4.3.3 Radiated Noise
The HE1.5XIN is 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 10' of
duct should be insulated. All parts of the FA and RA ducts located in a mechanical space with
noise-generating equipment also should be insulated for sound control, both to minimize sound
radiation out of the FA duct, and also to control sound radiation into both ducts.
5.0 INSTALLATION
5.2 FLOOR INSTALLATION
Most units are installed in a location specified by others. In general, it is preferable to install the
unit on a flat, reasonably level surface, such as a concrete floor. When positioning the unit, it is
not to be slid on its legs because they can be bent.
5.1 DUCTWORK
5.1.1 Ducts to the Outside
The exhaust outlet and fresh air inlet on the outside of the building should be at least 10' apart
to avoid cross-contamination. The exhaust outlet should not dump air into an enclosed space or
any other structure. The inlets and outlets should be screened against insects and vermin and
shielded from the weather to prevent the entry of rain or snow.
Ducts connecting the HE1.5XIN to the outside must be insulated, with sealed vapor barrier on
both inside and outside of the insulation. Insulate both the Outside Air (OA) and Exhaust Air (EA)
ducts.
5.1.2 Inside Ductwork System
Ensure Good Ductwork Design
Ductwork should be designed to allow the unit to provide the required airflow and reduce
pressure drop for efficient, quiet operation. If the inside ducts run through unconditioned spaces
they must be insulated with a sealed vapor barrier on both inside and outside of insulation.
NOTE: 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.
Tape both inner and outer
vapor barriers of insulated
duct to collars on duct
adapters. This is critical to
prevent migration of mois-
ture into insulation. Build-up
of moisture can result in
failure of the duct system
and/or frost in the insula-
tion. Make sure any tears
in the inner and outer vapor
barriers are sealed.
CAUTION