11
1.800.627.4499
EV-Series Indoor
ERV
UNIT PLACEMENT
7/8" Power In
7/8" Control In
10"
Round Typ.
(Optional
45EVT10
Transition
Kit Shown)
25 1/4"
11 1/4"
5 1/4" Typ.
Disconnect
Switch
5 1/8" Typ.
54 1/2" Overall
(with Round Transitions)
CL 2 1/4" Control In
CL 14 1/4" Power In
EA
OA
FA
RA
Pressure
Ports (4) Typ.
(2) 7/8" Holes
for Wiring in
Bottom of E-Box
33 7/8" Case
15 7/8"
Case
16 3/8"
Overall
6 3/8"
10 1/8"
26 1/4"
1 1/2" Typ.
44 1/8" Case
47 1/8" Overall
(with Flanges)
14 1/4" Minimum
Service Area (Doors can be Removed from
Hinges)
44 1/2" Minimum
Service Area
24 3/4"
TOP VIEW
Door
Swing
Door
Swing
4 1/4" Typ.
20 1/4"
Typ.
7/8"
Typ.
CL 2 5/8"
Control In
CL 4 1/8"
Power In
12" X 8" Typ.
Duct Flange
(Optional
45EVDF
Kit Shown)
2 1/8"
Typ.
36 3/8" Overall
RIGHT VIEW
FRONT VIEW
LEFT VIEW
Model: EV450IN
Drawing Type: Unit Dimension
Version: MAY17
ABBREVIATIONS
EA: Exhaust Air to outside
OA: Outside Air intake
RA: Room Air to be exhausted
FA: Fresh Air to inside
INSTALLATION ORIENTATION
Unit may be installed in any orientation.
NOTE
1. UNLESS OTHERWISE SPECIFIED,
DIMENSIONS ARE ROUNDED TO THE
NEAREST EIGHTH OF AN INCH.
2. SPECIFICATIONS MAY BE SUBJECT
TO CHANGE WITHOUT NOTICE.
4.2 SERVICE CLEARANCES
FIGURE 4.2.0 SERVICE CLEARANCES, TOP VIEW
Take these simple steps to attenuate noise from the unit.
4.3.1 Outside the Building
Exhaust velocity noise is the primary cause of unit-related noise outside the building. Size the
exhaust duct and grille for less than 1000 feet per minute (FPM) air velocity. 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 outlet ducts can be significant sources of radiated sound as well. The FA and EA ducts
(outlet ducts) 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 EA ducts located
in the mechanical space should be insulated for sound control, both to minimize sound radiation
out of these ducts and also to control sound radiation into the ducts.
4.3.4 Aerodynamic (Velocity) Noise
When sound attenuation is a design concern, the primary consideration is velocity noise at the
unit’s Fresh Air blower outlet. The average velocity at the blower outlets is 1100 FPM when the
unit is operating at 600 CFM.
4.3 SOUND ATTENUATION
For maximum air performance minimize the number of elbows, and do not place elbows within
3' of the EV450IN’s discharges. For applications where duct noise is a critical issue, use noise
attenuating techniques such as duct isolation, insulation, and proper duct design per SMACNA
or ASHRAE standards.
