Greenheck QEM User manual

Plenum Fans
Models QEM and QEP
Belt and Direct Drive
September
2008

Greenheck Fan
Corporation certifies
that the Model QEM
and QEP plenum
fans shown herein
are licensed to bear
the AMCA seal.
Direct Drive models
are not licensed
to bear the AMCA
Seal. The ratings shown are based on
tests and procedures performed in
accordance with AMCA Publication
211 and Publication 311 and comply
with the requirements of the AMCA
Certified Ratings Program.
Models QEM and QEP plenum fans are designed and engineered to provide superior performance and reliability
in commercial or industrial applications. Our products are manufactured with
state of the art laser, forming, spinning and welding equipment and
endure our quality control testing to ensure trouble free start-up.
Plenum fans are designed to handle a variety of commercial and
industrial projects. They are designed for unhoused operation which
results in a savings of the space normally occupied by the
fan housing. Additional space savings are realized
when multiple duct takeoffs are required. Ductwork is
connected directly to the pressurized plenum without
intermediate transitions. Typical applications include:
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Advantages of the QEM vs. QEP
Greenheck offers two solutions for your plenum design needs. The QEM is a cost effective
solution for performances in class I and most of class II as well. Fan selection is
simplified with one fan design for belt drive and another for direct drive, both
with motors mounted directly to the fan to reduce the fan’s footprint.
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the initial purchase cost of the QEM is lower than other plenum
fans, the QEM still shares the exact same performance
benefits of the high end model QEP.
Model QEP can be utilized when customers demand a
premium quality product, or need to reach performances in
the class III operating range. In addition to sharing the same
high-efficiency and low sound wheel design as the QEM,
the QEP also features longer life L10 80,000 hour bearings,
a powder coat finish, as well as a wider range of mounting
options and accessories.
2

Quiet & Efficient
Plenum Fans 
QEP arrangement 1 belt drive shown with
optional structural steel base and belt guard.
QEM arrangement 9 belt drive
shown with optional guarding.
Plenum Model Number Code:
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Model
QEM
QEP
Motor RPM
Arrangement
4 - Direct
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Fan Size
QEM 12-36
QEP 12-73
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Motor HP
Rotation
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Fan Class (QEP only, QEM exceeds Class I)
I, II, III
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1
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(Direct Drive only)

9-Blade Wheel 12-Blade Wheel
Octave Band
Sound Power (dB)
1 2 3 4 5 6 7 8 LwA
100
90
80
70
Sound Performance
Figures 2 and 3 show the inlet and outlet sound
spectrums for the size 33 unit used in the above
performance comparison.
Lower Sound Power (LwA)
The overall A-weighted sound power levels for
identical performance requirements show that the
12-bladed wheel design is quieter.
Easy to Attenuate
High sound power levels in the first and second
octave bands are difficult to attenuate. The 12-bladed
wheel generates less low frequency sound power.
Improved Sound Quality
A sound spectrum with a dominant tone can be
annoying to a listener. Greenheck’s 12-bladed wheel
provides balanced sound power levels across the
octave bands. This results in sound that is pleasing to
the listener.
Air Performance
Figure 1 plots the fan performance and efficiency of
two fans running at the same rpm. Increased wheel
efficiency allows the 12-bladed fan to produce more
airflow while using less energy.
9-Blade Wheel 12-Blade Wheel
Octave Band
Sound Power (dB)
1 2 3 4 5 6 7 8 LwA
100
90
80
70
Figure 1
Figure 2
Figure 3
8
7
6
5
4
3
2
1
0
80%
70%
60%
50%
40%
30%
20%
10%
0%
Static Pressure (in. wg) Static Efficiency
0 5 10 15 20 25 30 35
Volume (cfm x 1000)
9-Blade Wheel
12-Blade Wheel
RPM
Efficiency
Air Performance Comparison
Size 33 @ 1400 RPM
Inlet Sound Comparison - Size 33
Outlet Sound Comparison - Size 33
Advantages of 12-Blade Wheels
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performance is adequate, recent industry trends have seen the emergence
of 12-blade wheel designs where customers demand higher mechanical
efficiency and lower sound levels.
Model QEM and QEP plenum fans feature a 12-blade aluminum airfoil
construction wheel. As demonstrated in Figure 1, this 12-blade design
meets customer needs by providing higher efficiency, lower sound levels
as well as lower energy consumption.
Greenheck’s 12-blade wheel design features extruded aluminum blades
up to and including size 49, while the largest sizes utilize laser cut, die-
formed aluminum blades. The two performance examples below demonstrate the
superior performance of the 12-blade design.
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Type RPM #SBLF
HP
Motor
HP Size
Static
Eff. LwA
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Type RPM #SBLF
HP
Motor
HP Size
Static
Eff. LwA
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Performance Comparison
9 vs. 12-Blade Wheels 
3

4
Standard Construction
and Features 
QEM Arrangement 9
Motor on Right
QEP Arrangement 3


Standard Construction
and Features 
12-Blade Aluminum Airfoil Wheel
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high efficiency and low sound 12-blade airfoil
design. The aluminum wheel reduces start-up
torque requirements as well as shaft loading during
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blades to improve efficiency and reduce vibration. All
wheels are balanced to grade G6.3 per ANSI S2.19.
AMCA Air and Sound Certification
AMCA certification assures that all Greenheck plenum
fans will perform as cataloged. Fans are rated for air
performance as well as sound levels (inlet and outlet).
Quality Assurance
All plenum fans receive
a run test at the design
speed in the factory after
final assembly. QEM fans
are checked for amp draw
and the levels recorded.
QEP fans are subjected
to a complete vibration
analysis in three planes.
The recorded filter-in
vibration levels must meet
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A permanent record of this test is kept on file at the
factory for future reference. A copy of the test report
is available upon request.
Premium Quality Bearings
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supplied with air handling
quality bearings which are
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tolerance for swivel torque,
noise levels and bore size
specifications. Other
bearing design features
include concentric
mounting collars (no set
screws) which provide
superior grip force between
the collar and the fan shaft
as well as zerk fittings for
lubrication.
Drive Frame
All plenum fans feature
a laser cut and formed
framework. Model QEM
utilizes a galvanized
construction, while the
QEP features a fully
welded design with
Permatector™, an electrostatically applied polyester
urethane powder coat finish.
Fan Shaft
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is turned, ground, polished and sized such that the
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speed for increased bearing life and decreased
vibration.
CAD Drawings Available
To assist with system design and layout, 2D CAD files
for all plenum fans are available. Drawings can be
downloaded directly through the CAPS program after
product selection at www.greenheck.com or consult
the factory.
QEM QEP
Available Sizes 11 sizes
12–36
18 sizes
12–73
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17 m3T
200,000 cfm
99 m3T
Maximum Pressure JOXH
1.6 kPa
12 in. wg
3 kPa
Performance Classes I, II (Partial) I, II, III
Arrangements 4, 9 1, 3, 4
Mounting Horizontal Horizontal,
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AMCA Air Standard Standard
AMCA Sound Standard Standard
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L10IST- 400,000 hrs /" Standard
Framework Construction
Galvanized Steel Standard /"
Permatector™ Coated Steel /" Standard
Integral Lifting Points Standard Standard

6
Optional Construction

QEP
QEM
Inlet Guard
Protective Cage
Shaft Guard
Belt Guard
Protective Cage
Structural Isolation Base
Inlet Guard
Protective Cage
Belt Guard
Protective Cage

7
Optional Construction
& Accessories 
Inlet Guard
Assembled and mounted low-pressure loss, zinc
coated guards.
Belt Guard
Custom guarding with two tachometer holes and belt
tension inspection door, assembled and mounted.
Protective Cage
Totally enclosed guard to protect personnel from
unhoused spinning wheel. Typically packaged
with a belt guard to provide complete protection.
(arrangement 1 QEP also requires a shaft guard).
Shaft Guard
Formed guard that covers the shaft between the belt
guard and the plenum cage (arrangement 1 only).
Extended Lube Lines
Allows for bearing lubrication from a remote location.
Ideal for guarded fans or for relocating all lubrication
requirements to a single, readily accessible location.
Factory Selected Drives
Cast iron sheaves and matched belts standard
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to provide reduced vibration levels and minimize
installation costs.
Motor for use with Frequency Drive
Motors meet EPACT or NEMA Premium efficiencies
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Disconnect Switch
Toggle type and heavy duty disconnect switches are
available for positive electrical shutoff and safety
when servicing fans.
Sure-Aire™ Flow Measurement
Sure-Aire™ provides the real-time flow measurement
for use in building automation systems. The Sure-
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and does not impact fan performance.
Isolators
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or spring mounts. The isolators are sized to match the
fan weight at each mounting point.
Isolation Base (QEP)
Provides a known space envelope for the complete
fan assembly. Compact C-channel platform welded
for superior rigidity and solid foundation.
Extended Life Bearings (QEP)
Air handling quality, pillow block bearings meet a
basic rating fatigue life L10QFS"#."TUBOEBSET
in excess of 200,000 hours at maximum operating
speed. Equivalent to average or L life of 1,000,000
hours.
Inlet Vane Damper (QEP)
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modulation of airflow or one-time system balance at
start-up.
Inlet Collar (QEP)
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cone (arrangement 1 and 4) to allow for round slip-fit
connections to the fan inlet.
Inlet Flange (QEP)
Circular inlet flanges with pre-punched holes provide
an easy means for bolted connection to ductwork.
Requires an inlet collar. Matching bolt-on companion
flanges are also available.
Special Coatings (QEP)
Special coatings are available for protective purposes.
Coatings are applied before assembly so that each
manufactured component is coated inside and out.
Consult Greenheck’s Product Application Guide,
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complete listing of coatings and a relative resistance
chart.
QEM QEP
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L10 IST- 1,000,000 hrs /" Optional
Isolation
Direct Mount Isolators Optional Optional
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OSHA Compliant Guarding
Guard, Inlet Optional Optional
(VBSE#FMU Optional
Guard
Package
Optional
Guard, Shaft Optional
Protective Cage Optional
Extended Lube Lines Optional Optional
Sure-Aire™ Flow Monitor Optional Optional
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Inlet Collar /" Optional
Flange, Inlet /" Optional
Special Powder Coatings /" Optional

QEP Arrangement 1 — Horizontal, Motor on Base
Sizes 12—73
(shown with optional base & belt guard)
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QEP Arrangement 3 — Horizontal, Motor on Base
Sizes 18—73
(shown with optional base & belt guard)
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QEP Arrangement 3 — Horizontal, Motor on Frame (Side)
Sizes 12—73
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QEP Arrangement 3 — Horizontal, Motor on Frame (Top)
Sizes 12—73
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QEP Arrangement 4 — Horizontal, Direct Drive
Sizes 15—60
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QEP Arrangement 3 — Vertical, Motor on Frame
Sizes 12—54
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8
Arrangements


QEM Arrangement 9 — Horizontal, Motor on Frame (Side)
Sizes 12—36
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QEM Arrangement 4 — Horizontal, Direct Drive
Sizes 15—36
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Available Motor on Frame Positions
9
Arrangements

Z W
Y X
Left Top Right
Available Motor on Base Positions

10
System
Considerations 
Air Plenum Design Guidelines
To assure optimum performance and be able to use
the system effect coefficients below, the following
guidelines should be adhered to in the plenum design:
1. Flexible connections at the inlet are recommended to
isolate vibration. The inlet connection can be square
(connected to the inlet panel) or round (connected
to an optional inlet collar).
2. Plenum walls should be at least one-half of a wheel
diameter away from the fan.
3. Dampers or coils should be at least three-quarters
of a wheel diameter away from the fan to assure an
even velocity distribution through them.
4. For fans operating in parallel:
Have one wheel diameter clearance between
adjacent fans.
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should be used to prevent windmilling of wheels if
fans are started or stopped at different times.
Do not select fans near the top of the fan curve to
prevent unstable operation.
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between the fans.
See AMCA Publication 201 for additional information
on this subject.
Duct System Effect
Reduction in cataloged air performance due to a plenum
around the fan is called a system effect. System effect
is a pressure loss, which must be added to the total
external static pressure of the duct system in order to
make the proper fan selection from catalog data. The
pressure loss calculation is based on the velocity of
the air in the discharge ductwork. As shown below, it
is derived by multiplying the appropriate coefficient by
the velocity pressure.
Effects of Air Density
Ratings in the fan performance tables and curves of
this catalog are based on standard air: clean and dry
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29.92 in. of mercury. A change in elevation, temperature
or the type of gas handled will affect density. A fan
running at a constant speed and installed in a fixed
system will experience changes in pressure output and
horsepower consumption if the density of the airstream
varies. The air volume delivered by the fan will remain
constant regardless of air density.
Example of Performance Correction
Select a fan to meet the following requirements:
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Airstream Temperature: 70°F
Installation Elevation: 13,000 ft.
Plenum Discharges (ducted): 24 in. x 27 in. Radial
24 in. x 27 in. Axial
1. The selection is at non-standard atmospheric
conditions and must be corrected to standard
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at 20,000 cfm, since the volume delivered is not
affected by air density.
2. An air density correction factor must be applied to
the static pressure. For an elevation of 13,000 ft. and
a temperature of 70°F, 1.6 is the required correction
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the static pressure by multiplying the required static
pressure by the correction factor.
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Discharge Configuration Coefficients
Discharge Radial Axial
Unducted 2.0 2.3
Ducted  1.8
Ducted
with Bell 1.1 1.4
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24 in. x 27 in.
(Radial)
24 in. x 27 in.
(Axial)