Plenum Fans
Models QEM and QEP
Belt and Direct Drive
September
2008
Quiet & Efficient
Plenum Fans
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
Plenum fans are designed to handle a variety of commercial industrial projects. They are designed for unhoused operation 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:
t 1BSLJOH HBSBHFT
t 1BDLBHFE BJS IBOEMFST
t #VJMU VQ BJS IBOEMFST
t $VTUPN BJS IBOEMFST
t (FOFSBM TVQQMZ BOE SFUVSO TZTUFNT
QEM arrangement 9 belt drive shown with optional guarding.
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.
simplified with one fan design for belt drive and another for direct with motors mounted directly to the fan to reduce the fan’s footprint
#PUI BSSBOHFNFOUT DPWFS UIF FOUJSF 2&. PQFSBUJOH SBOHF 8IJMF 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.
QEP arrangement 1 belt drive shown with optional structural steel base and belt guard.
Plenum Model Number Code:
2&1$8 ** 1 #
Fan Size
QEM 12-36
QEP 12-73
Model
QEM
QEP
Arrangement 4 - Direct
#FMU
Rotation $8$$8
Motor HP
Motor RPM |
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A |
' |
# |
M |
$ |
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1FSDFOUBHF 8IFFM 8JEUI
(Direct Drive only)
1
1 11 1
Fan Class (QEP only, QEM exceeds Class I) I, II, III
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.
2
Performance Comparison
9 vs. 12-Blade Wheels |
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Advantages of 12-Blade Wheels
5SBEJUJPOBM DFOUSJGVHBM XIFFMT VUJMJ[F CMBEF XIFFM EFTJHOT 8IJMF UIFJS 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.
4J[F 1FSGPSNBODF $SJUFSJB PG $'. ! JO XH
8IFFM |
RPM |
#SBLF |
Motor |
Static |
LwA |
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Type |
HP |
HP Size |
Eff. |
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#MBEF |
2607 |
7.76 |
10 |
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96 |
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#MBEF |
2400 |
6.37 |
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90 |
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4J[F 1FSGPSNBODF $SJUFSJB PG $'. ! JO XH
8IFFM |
RPM |
#SBLF |
Motor |
Static |
LwA |
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Type |
HP |
HP Size |
Eff. |
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#MBEF |
1469 |
26.9 |
30 |
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96 |
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#MBEF |
1416 |
23.9 |
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92 |
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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.
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 Comparison
Size 33 @ 1400 RPM
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9-Blade Wheel |
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RPM |
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12-Blade Wheel |
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Efficiency |
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8 |
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80% |
wg) |
7 |
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70% |
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6 |
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60% |
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(in. |
5 |
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50% |
Pressure |
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4 |
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40% |
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Static |
3 |
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30% |
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2 |
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20% |
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1 |
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10% |
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0 |
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0% |
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0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
Volume (cfm x 1000)
Figure 1
Inlet Sound Comparison - Size 33
9-Blade Wheel 12-Blade Wheel
(dB) |
100 |
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90 |
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Power |
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80 |
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Sound |
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70 |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
LwA |
Octave Band
Figure 2
Outlet Sound Comparison - Size 33
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9-Blade Wheel |
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12-Blade Wheel |
(dB) |
100 |
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90 |
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Power |
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80 |
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Sound |
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70 |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
LwA |
Octave Band
Figure 3
Static Efficiency
3
Standard Construction
and Features
QEM Arrangement 9
Motor on Right
QEP Arrangement 3
4
Standard Construction
and Features
12-Blade Aluminum Airfoil Wheel
#PUI UIF 2&. BOE 2&1 QMFOVNT GFBUVSF UIF TBNF high efficiency and low sound 12-blade airfoil design. The aluminum wheel reduces start-up torque requirements as well as shaft loading during
PQFSBUJPO #MBEFT GPS TJ[FT BSF DPOTUSVDUFE PG5 BMVNJOVN FYUSVTJPOT XIJMF TJ[FT VUJMJ[F QSFDJTJPO MBTFS DVU BOE EJF GPSNFE BMVNJOVN 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
UIF SFRVJSFNFOUT PG #7 ".$" "/4* TUBOEBSE#BMBODF 2VBMJUZ BOE 7JCSBUJPO -FWFMT GPS 'BOT
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
#FMU ESJWF QMFOVN GBOT BSF supplied with air handling quality bearings which are
JOTQFDUFE UP CF XJUIJO 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.
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QEM |
QEP |
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Available Sizes |
11 sizes |
18 sizes |
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12–36 |
12–73 |
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.BYJNVN 7PMVNF |
DGN |
200,000 cfm |
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17 m3 T |
99 m3 T |
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Maximum Pressure |
JO XH |
12 in. wg |
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1.6 kPa |
3 kPa |
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Performance Classes |
I, II (Partial) |
I, II, III |
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Arrangements |
4, 9 |
1, 3, 4 |
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Mounting |
Horizontal |
Horizontal, |
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7FSUJDBM |
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8IFFM #MBEF "MVNJOVN |
Standard |
Standard |
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AMCA Air |
Standard |
Standard |
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AMCA Sound |
Standard |
Standard |
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8IFFM #BMBODF |
G 6.3 |
G 6.3 |
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3FDPSEFE 7JCSBUJPO 4JHOBUVSF |
No |
Standard |
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#FBSJOHT -JGF 3BUJOHT |
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L10ISTIST |
Standard |
/ " |
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L10IST400,000 hrs |
/ " |
Standard |
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Framework Construction |
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Galvanized Steel |
Standard |
/ " |
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Permatector™ Coated Steel |
/ " |
Standard |
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Integral Lifting Points |
Standard |
Standard |
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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
4IBGUJOH UISPVHI JO NN EJBNFUFS JT "*4* TUFFM -BSHFS TIBGUT BSF "*4* TUFFM "MM TIBGUJOH is turned, ground, polished and sized such that the
GJSTU DSJUJDBM TQFFE JT PG UIF NBYJNVN PQFSBUJOH 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.
Optional Construction
QEM
Protective Cage
Inlet Guard
Belt Guard
Protective Cage
QEP
Protective Cage
Inlet Guard
Shaft Guard
Belt Guard
Protective Cage
Structural Isolation Base
6
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
XJUI B ESJWF TFSWJDF GBDUPS *OTUBMMFE BOE BMJHOFE to provide reduced vibration levels and minimize installation costs.
Motor for use with Frequency Drive
Motors meet EPACT or NEMA Premium efficiencies
BOE BSF BWBJMBCMF JO 7'% DPNQBUJCMF DPOTUSVDUJPO
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-
"JSFhT OPO JOWBTJWF EFTJHO JT BDDVSBUF UP XJUIJO and does not impact fan performance.
Isolators
#BTF NPVOU JTPMBUPST BSF BWBJMBCMF JO FJUIFS OFPQSFOF 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.
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QEM |
QEP |
#FBSJOHT &YUFOEFE -JGF |
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L10 IST- 1,000,000 hrs |
/ " |
Optional |
Isolation |
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Direct Mount Isolators |
Optional |
Optional |
4USVDUVSBM #BTF X *TPMBUPST |
/ " |
Optional |
OSHA Compliant Guarding |
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Guard, Inlet |
Optional |
Optional |
(VBSE #FMU |
Optional |
Optional |
Guard, Shaft |
Guard |
Optional |
Protective Cage |
Package |
Optional |
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Extended Lube Lines |
Optional |
Optional |
Sure-Aire™ Flow Monitor |
Optional |
Optional |
*OMFU 7BOF %BNQFS /FTUFE |
/ " |
Optional |
Inlet Collar |
/ " |
Optional |
Flange, Inlet |
/ " |
Optional |
Special Powder Coatings |
/ " |
Optional |
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)
#VJMU JOUP UIF JOMFU DPOF BOE BMMPXT GPS DPOUJOVPVT modulation of airflow or one-time system balance at start-up.
Inlet Collar (QEP)
8FMEFE UP UIF GBO JOMFU QBOFM BSSBOHFNFOU PS JOMFU 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,
1FSGPSNBODF $PBUJOHT GPS 7FOUJMBUJPO 1SPEVDUT GPS B complete listing of coatings and a relative resistance chart.
7
Arrangements
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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t 3FRVJSFT TFQBSBUF TUSVDUVSBM CBTF GPS NPUPS NPVOUJOH t .PUPS GSBNF TJ[F EPFT OPU MJNJU BWBJMBCJMJUZ
QEP Arrangement 3 — Horizontal, Motor on Frame (Side) Sizes 12—73
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t 6TFE JO JOTUBMMBUJPOT XJUI UJHIU TQBDFT BOE MPXFS PWFSIFBE DMFBSBODF t /P TFQBSBUF CBTF SFRVJSFE GPS NPVOUJOH NPUPS
t -JNJUFE BWBJMBCJMJUZ CBTFE PO NPUPS GSBNF TJ[F
t .PUPS TMJEF CBTF QSPWJEFT GPS DPOWFOJFOU CFMU UJHIUFOJOH
QEP Arrangement 3 — Horizontal, Motor on Frame (Top) Sizes 12—73
t $PNQBDU EFTJHO XJUI NPUPS NPVOUFE UP UPQ PG GBO t /P TFQBSBUF CBTF SFRVJSFE GPS NPVOUJOH NPUPS
t -JNJUFE BWBJMBCJMJUZ CBTFE PO NPUPS GSBNF TJ[F
t .PUPS TMJEF CBTF QSPWJEFT GPS DPOWFOJFOU CFMU UJHIUFOJOH
QEP Arrangement 3 — Vertical, Motor on Frame Sizes 12—54
t $PNQBDU EFTJHO XJUI NPUPS NPVOUFE UP TJEF PG GBO
t /P TFQBSBUF TUSVDUVSBM CBTF SFRVJSFE GPS NPVOUJOH NPUPS t -JNJUFE BWBJMBCJMJUZ CBTFE PO NPUPS GSBNF TJ[F
t .PUPS TMJEF CBTF QSPWJEFT GPS DPOWFOJFOU CFMU UJHIUFOJOH
QEP Arrangement 4 — Horizontal, Direct Drive Sizes 15—60
t .JOJNBM NBJOUFOBODF XJUI OP CFMUT PS QVMMFZT t -PX WJCSBUJPO MFWFMT
t $PNQBDU TQBDF TBWJOH EFTJHO XJUI NPUPS EJSFDUMZ DPOOFDUFE UP XIFFM t %JGGFSFOU QFSGPSNBODFT UISPVHI XIFFM XJEUI BOE NPUPS SQN WBSJBUJPOT t &MJNJOBUJPO PG CFMU SFTJEVF UIBU DBO DPOUBNJOBUF UIF BJSTUSFBN
8
Arrangements
QEM Arrangement 9 — Horizontal, Motor on Frame (Side) Sizes 12—36
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t 6TFE JO JOTUBMMBUJPOT XJUI UJHIU TQBDFT BOE MPXFS PWFSIFBE DMFBSBODF t /P TFQBSBUF CBTF SFRVJSFE GPS NPVOUJOH NPUPS
t .PUPS TMJEF CBTF QSPWJEFT GPS DPOWFOJFOU CFMU UJHIUFOJOH
QEM Arrangement 4 — Horizontal, Direct Drive Sizes 15—36
t .JOJNBM NBJOUFOBODF XJUI OP CFMUT BOE QVMMFZT t -PX WJCSBUJPO MFWFMT
t $PNQBDU TQBDF TBWJOH EFTJHO XJUI NPUPS EJSFDUMZ DPOOFDUFE UP XIFFM t %JGGFSFOU QFSGPSNBODF UISPVHI XIFFM XJEUI BOE NPUPS SQN WBSJBUJPOT t &MJNJOBUJPO PG CFMU SFTJEVF UIBU DBO DPOUBNJOBUF UIF BJSTUSFBN
Available Motor on Frame Positions
Left |
Top |
Right |
Available Motor on Base Positions
Z W
Y X
9
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.
#BDLTUPQ DMVUDIFT PS CBDLGMPX DPOUSPM EBNQFST 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.
8IFFMT TIPVME CF TFMFDUFE BT DPOUSB SPUBUJOH
$8 $$8 $8 FUD UP JNQSPWF BJSGMPX QBUUFSOT 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.
Discharge Configuration Coefficients
Discharge |
Radial |
Axial |
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Unducted |
2.0 |
2.3 |
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Ducted |
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1.8 |
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Ducted |
1.1 |
1.4 |
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with Bell |
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5"#-& %JTDIBSHF $PFGGJDJFOUT
Effects of Air Density
Ratings in the fan performance tables and curves of this catalog are based on standard air: clean and dry
XJUI B EFOTJUZ PG MCT GU3 at 70°F at a pressure of 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.
24 in. x 27 in. (Radial)
24 in. x 27 in. (Axial)
Example of Performance Correction
Select a fan to meet the following requirements:
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7PMVNF |
DGN |
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4UBUJD 1SFTTVSF |
JO XH |
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Airstream Temperature: |
70°F |
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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
DPOEJUJPOT UP VTF DBUBMPHFE EBUB 7PMVNF SFNBJOT 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
GBDUPS 5BCMF " 6TF UIF DPSSFDUJPO GBDUPS UP BEKVTU the static pressure by multiplying the required static pressure by the correction factor.
JO XH Y JO XH
10
System
Considerations
3.System effects for plenum discharges must also be calculated and added to the design pressure. In a properly designed plenum (see Duct System Effect
section), the system effect coefficient (Co) depends on the orientation of the discharge relative to the fan and duct connection (if any). For air plenums with multiple discharges, calculate the system effect by using the highest loss coefficient for all discharges. In this example, the discharges are ducted so the
highest loss will be axial (Co "TTVNF UIBU UIF two discharges will each handle 10,000 cfm.
Plenum Exit Velocity [ft/min]
7PMVNF <GU3 NJO> 0VUMFU "SFB <GU2>
<GU3 NJO> JO Y JO <JO2 GU2>
<GU NJO>
System Effect
$o Y %FOTJUZ <MC GU3> Y
&YJU 7FMPDJUZ <GU NJO> 2
Y Y 2
4.Now select a fan size from the catalog data based on the corrected performance. The corrected static
QSFTTVSF PG JO XH QMVT UIF TZTUFN FGGFDU PGJO XH NFBOT UIF GBO TIPVME CF TFMFDUFE GPS
20,000 cfm at 4.0 in. wg. A size 33 plenum will meet this performance at 1290 frpm using 17.9 bhp. (Note: The bhp does not include drive losses. Consult AMCA Publication 203-90 for help in estimating drive
MPTTFT #BTFE PO UIF SFRVJSFE GSQN UIF VTFS IBT the option of selecting either model QEM or QEP.
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ELEVATION (FEET ABOVE SEA LEVEL) |
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0 |
1000 |
2000 |
3000 |
4000 |
5000 |
6000 |
7000 |
8000 |
9000 |
10000 |
11000 |
12000 |
13000 |
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-50 |
0.77 |
0.80 |
0.83 |
0.86 |
0.89 |
0.93 |
0.96 |
1.00 |
1.03 |
1.07 |
1.11 |
1.15 |
1.20 |
1.24 |
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-25 |
0.82 |
0.85 |
0.88 |
0.92 |
0.95 |
0.98 |
1.02 |
1.06 |
1.10 |
1.14 |
1.18 |
1.22 |
1.27 |
1.32 |
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0 |
0.87 |
0.90 |
0.93 |
0.97 |
1.00 |
1.04 |
1.08 |
1.12 |
1.16 |
1.20 |
1.25 |
1.29 |
1.34 |
1.39 |
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50 |
0.96 |
1.00 |
1.03 |
1.07 |
1.11 |
1.15 |
1.20 |
1.24 |
1.29 |
1.33 |
1.38 |
1.44 |
1.49 |
1.54 |
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70 |
1.00 |
1.04 |
1.08 |
1.12 |
1.16 |
1.20 |
1.24 |
1.29 |
1.34 |
1.39 |
1.44 |
1.49 |
1.55 |
1.60 |
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(°F) |
100 |
1.06 |
1.10 |
1.14 |
1.18 |
1.22 |
1.27 |
1.31 |
1.36 |
1.41 |
1.47 |
1.52 |
1.58 |
1.63 |
1.69 |
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150 |
1.15 |
1.19 |
1.24 |
1.28 |
1.33 |
1.38 |
1.43 |
1.48 |
1.54 |
1.60 |
1.66 |
1.72 |
1.78 |
1.85 |
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TEMPERATURE |
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200 |
1.25 |
1.29 |
1.34 |
1.39 |
1.44 |
1.49 |
1.55 |
1.61 |
1.67 |
1.73 |
1.79 |
1.86 |
1.93 |
2.00 |
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250 |
1.34 |
1.39 |
1.44 |
1.49 |
1.55 |
1.61 |
1.67 |
1.73 |
1.79 |
1.86 |
1.93 |
2.00 |
2.07 |
2.15 |
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300 |
1.43 |
1.49 |
1.54 |
1.60 |
1.66 |
1.72 |
1.78 |
1.85 |
1.92 |
1.99 |
2.06 |
2.14 |
2.22 |
2.30 |
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350 |
1.53 |
1.58 |
1.64 |
1.70 |
1.77 |
1.83 |
1.90 |
1.97 |
2.04 |
2.12 |
2.20 |
2.28 |
2.36 |
2.45 |
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400 |
1.62 |
1.68 |
1.74 |
1.81 |
1.88 |
1.95 |
2.02 |
2.09 |
2.17 |
2.25 |
2.33 |
2.42 |
2.51 |
2.60 |
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450 |
1.72 |
1.78 |
1.85 |
1.91 |
1.99 |
2.06 |
2.14 |
2.21 |
2.30 |
2.38 |
2.47 |
2.56 |
2.66 |
2.75 |
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AIRSTREAM |
500 |
1.81 |
1.88 |
1.95 |
2.02 |
2.09 |
2.17 |
2.25 |
2.34 |
2.42 |
2.51 |
2.60 |
2.70 |
2.80 |
2.90 |
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550 |
1.91 |
1.98 |
2.05 |
2.13 |
2.20 |
2.29 |
2.37 |
2.46 |
2.55 |
2.64 |
2.74 |
2.84 |
2.95 |
3.06 |
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600 |
2.00 |
2.07 |
2.15 |
2.23 |
2.31 |
2.40 |
2.49 |
2.58 |
2.67 |
2.77 |
2.88 |
2.98 |
3.09 |
3.21 |
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650 |
2.09 |
2.17 |
2.25 |
2.34 |
2.42 |
2.51 |
2.60 |
2.70 |
2.80 |
2.90 |
3.01 |
3.12 |
3.24 |
3.36 |
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700 |
2.19 |
2.27 |
2.35 |
2.44 |
2.53 |
2.62 |
2.72 |
2.82 |
2.93 |
3.04 |
3.15 |
3.26 |
3.38 |
3.51 |
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750 |
2.28 |
2.37 |
2.46 |
2.55 |
2.64 |
2.74 |
2.84 |
2.94 |
3.05 |
3.17 |
3.28 |
3.40 |
3.53 |
3.66 |
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800 |
2.38 |
2.47 |
2.56 |
2.65 |
2.75 |
2.85 |
2.96 |
3.07 |
3.18 |
3.30 |
3.42 |
3.55 |
3.68 |
3.81 |
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850 |
2.47 |
2.56 |
2.66 |
2.76 |
2.86 |
2.96 |
3.07 |
3.19 |
3.31 |
3.43 |
3.55 |
3.69 |
3.82 |
3.96 |
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900 |
2.57 |
2.66 |
2.76 |
2.86 |
2.97 |
3.08 |
3.19 |
3.31 |
3.43 |
3.56 |
3.69 |
3.83 |
3.97 |
4.12 |
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950 |
2.66 |
2.76 |
2.86 |
2.97 |
3.08 |
3.19 |
3.31 |
3.43 |
3.56 |
3.69 |
3.83 |
3.97 |
4.11 |
4.27 |
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1000 |
2.75 |
2.86 |
2.96 |
3.07 |
3.19 |
3.30 |
3.43 |
3.55 |
3.68 |
3.82 |
3.96 |
4.11 |
4.26 |
4.42 |
5"#-& " %FOTJUZ $PSSFDUJPO 'BDUPST*NQFSJBM 6OJUT
Airstream Temperature Variations
8IFO B GBO JT TFMFDUFE UXP UFNQFSBUVSFT JO UIF airstream should be considered: Start-up and normal
PQFSBUJPO 8IJMF UIF IQ SFRVJSFE JT SFEVDFE BU IJHIFS temperatures, the motor must be sized based the lowest temperature that could be present in the airstream (when air density is at its maximum value).
Reconsider the example assuming that the fan was operating at 9,000 ft. elevation with a start-up
BJSTUSFBN UFNQFSBUVSF PG ¡' BOE B OPSNBM PQFSBUJOH UFNQFSBUVSF PG ¡' /PUF UIF OFX OPSNBM PQFSBUJOH conditions require the same density correction factor as 13,000 ft. elevation at 70°F, so the fan selection is still valid.)
'JSTU DBMDVMBUF IQ BU UIF TUBSU VQ DPOEJUJPO 'PS ¡' at 9,000 ft. elevation, the air density correction factor (Table 2A) is 1.14. Divide the cataloged bhp by the correction factor.
CIQ BU TUBSU VQ
Now calculate hp during normal operation using the
TBNF QSPDFEVSF CVU GPS ¡' BU GU FMFWBUJPO
CIQ EVSJOH OPSNBM PQFSBUJPO
The motor should be sized based on the larger of these two values. So although the normal operation would
POMZ SFRVJSF B IQ NPUPS UIF GBO TIPVME CF TFMFDUFE with a 20 hp motor based on the higher hp requirement at start-up.
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ELEVATION (METERS ABOVE SEA LEVEL) |
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0 |
250 |
500 |
750 |
1000 |
1250 |
1500 |
1750 |
2000 |
2250 |
2500 |
2750 |
3000 |
3500 |
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-50 |
0.76 |
0.78 |
0.81 |
0.83 |
0.85 |
0.88 |
0.91 |
0.93 |
0.96 |
0.99 |
1.02 |
1.05 |
1.08 |
1.15 |
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-25 |
0.84 |
0.87 |
0.90 |
0.92 |
0.95 |
0.98 |
1.01 |
1.04 |
1.07 |
1.10 |
1.14 |
1.17 |
1.21 |
1.28 |
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0 |
0.93 |
0.96 |
0.99 |
1.02 |
1.05 |
1.08 |
1.11 |
1.14 |
1.18 |
1.21 |
1.25 |
1.29 |
1.33 |
1.41 |
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21 |
1.00 |
1.03 |
1.06 |
1.09 |
1.13 |
1.16 |
1.20 |
1.23 |
1.27 |
1.31 |
1.35 |
1.39 |
1.43 |
1.52 |
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50 |
1.10 |
1.13 |
1.17 |
1.20 |
1.24 |
1.27 |
1.31 |
1.35 |
1.39 |
1.44 |
1.48 |
1.52 |
1.57 |
1.67 |
(°C) |
75 |
1.18 |
1.22 |
1.26 |
1.29 |
1.33 |
1.37 |
1.41 |
1.46 |
1.50 |
1.55 |
1.59 |
1.64 |
1.69 |
1.80 |
100 |
1.27 |
1.31 |
1.35 |
1.39 |
1.43 |
1.47 |
1.52 |
1.56 |
1.61 |
1.66 |
1.71 |
1.76 |
1.81 |
1.92 |
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TEMPERATURE |
125 |
1.35 |
1.39 |
1.44 |
1.48 |
1.52 |
1.57 |
1.62 |
1.67 |
1.72 |
1.77 |
1.82 |
1.88 |
1.93 |
2.05 |
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150 |
1.44 |
1.48 |
1.53 |
1.57 |
1.62 |
1.67 |
1.72 |
1.77 |
1.82 |
1.88 |
1.94 |
2.00 |
2.06 |
2.18 |
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175 |
1.52 |
1.57 |
1.62 |
1.67 |
1.72 |
1.77 |
1.82 |
1.88 |
1.93 |
1.99 |
2.05 |
2.11 |
2.18 |
2.31 |
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200 |
1.61 |
1.66 |
1.71 |
1.76 |
1.81 |
1.87 |
1.92 |
1.98 |
2.04 |
2.10 |
2.17 |
2.23 |
2.30 |
2.44 |
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225 |
1.69 |
1.74 |
1.80 |
1.85 |
1.91 |
1.96 |
2.02 |
2.09 |
2.15 |
2.21 |
2.28 |
2.35 |
2.42 |
2.57 |
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250 |
1.78 |
1.83 |
1.89 |
1.94 |
2.00 |
2.06 |
2.13 |
2.19 |
2.26 |
2.32 |
2.39 |
2.47 |
2.54 |
2.70 |
AIRSTREAM |
275 |
1.86 |
1.92 |
1.98 |
2.04 |
2.10 |
2.16 |
2.23 |
2.29 |
2.36 |
2.44 |
2.51 |
2.58 |
2.66 |
2.83 |
400 |
2.29 |
2.36 |
2.43 |
2.50 |
2.58 |
2.65 |
2.73 |
2.82 |
2.90 |
2.99 |
3.08 |
3.17 |
3.27 |
3.47 |
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300 |
1.95 |
2.01 |
2.07 |
2.13 |
2.19 |
2.26 |
2.33 |
2.40 |
2.47 |
2.55 |
2.62 |
2.70 |
2.78 |
2.96 |
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325 |
2.03 |
2.09 |
2.16 |
2.22 |
2.29 |
2.36 |
2.43 |
2.50 |
2.58 |
2.66 |
2.74 |
2.82 |
2.91 |
3.08 |
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350 |
2.12 |
2.18 |
2.25 |
2.31 |
2.38 |
2.46 |
2.53 |
2.61 |
2.69 |
2.77 |
2.85 |
2.94 |
3.03 |
3.21 |
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375 |
2.20 |
2.27 |
2.34 |
2.41 |
2.48 |
2.56 |
2.63 |
2.71 |
2.79 |
2.88 |
2.97 |
3.06 |
3.15 |
3.34 |
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425 |
2.37 |
2.44 |
2.52 |
2.59 |
2.67 |
2.75 |
2.84 |
2.92 |
3.01 |
3.10 |
3.20 |
3.29 |
3.39 |
3.60 |
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450 |
2.46 |
2.53 |
2.61 |
2.69 |
2.77 |
2.85 |
2.94 |
3.03 |
3.12 |
3.21 |
3.31 |
3.41 |
3.51 |
3.73 |
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475 |
2.54 |
2.62 |
2.70 |
2.78 |
2.86 |
2.95 |
3.04 |
3.13 |
3.23 |
3.32 |
3.42 |
3.53 |
3.63 |
3.86 |
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500 |
2.63 |
2.71 |
2.79 |
2.87 |
2.96 |
3.05 |
3.14 |
3.24 |
3.33 |
3.43 |
3.54 |
3.65 |
3.76 |
3.99 |
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550 |
2.80 |
2.88 |
2.97 |
3.06 |
3.15 |
3.25 |
3.34 |
3.44 |
3.55 |
3.66 |
3.77 |
3.88 |
4.00 |
4.24 |
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5"#-& # %FOTJUZ $PSSFDUJPO 'BDUPST.FUSJD 6OJUT
11