This master should be used by designers working on Port of Portland construction projects and by designers working for PDX
tenants (“Tenants”). Usage notes highlight a few specific editing choices, however the entire section should be evaluated and
edited to fit specific project needs.
SECTION 233400 - HVAC FANS
PART 1 - GENERAL
1.1
DESCRIPTION
A.
1.2
This section describes centrifugal fans, in-line centrifugal fans, roof exhaust fans, plug fans,
roof vents, small cabinet fans, propeller fans, and pressure blowers.
RELATED WORK SPECIFIED ELSEWHERE
A.
Section 230500, Common Work Results for HVAC
B.
Section 230529, Hangers and Supports for HVAC Piping and Equipment
C.
Section 230545, Seismic Restraints for HVAC Piping and Equipment
D.
Section 230548, Vibration and Seismic Controls for HVAC Piping and Equipment
E.
Section 230553, Identification for HVAC Piping and Equipment
F.
Section 230593, Testing, Adjusting, and Balancing
G.
Section 230900, Instrumentation and Controls for HVAC
H.
Section 233300, Air Duct Accessories
1.3
REFERENCES
A.
AFBMA: Anti-Friction Bearing Manufacturers Association
B.
NFPA: National Fire Protection Association
1.
NFPA 96: Standard for Ventilation Control and Fire Protection of Commercial Cooking
Operations
1.4
SUBMITTALS
A.
For systems, equipment, and components specified herein, submit product/material data; shop
drawings; operation and maintenance data; as-constructed data; installation, startup, and testing
manuals; operation and maintenance manuals; and as-constructed drawings.
1.
Shop Drawings: Include dimensions and details of construction.
2.
Product Data: Include performance of fans.
3.
Provide certified sound power ratings for each fan.
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Use B only if Commissioning Section 019100 is included in the project manual.
B.
For systems, equipment, and components specified herein, submit commissioning plans and
schedules; checkout, startup, operational, functional and final acceptance test plans, procedures,
checklists, and reports; and operation and maintenance training plans.
PART 2 - PRODUCTS
Tenants: Throughout Part 2, delete all instances of “or pre-bid approved equal” and replace with “no substitution,” unless otherwise noted.
2.1
CENTRIFUGAL FANS
A.
Acceptable Manufacturers: Pace, Trane, Barry, Twin City, Peerless, Aerovent, Acme,
Greenheck, Cook, or pre-bid approved equal.
B.
Description: Centrifugal or utility type centrifugal fans as indicated, standard factory finish,
AMCA rated.
C.
Fans:
1.
Single width, single inlet, double width, double inlet, forward curved, backward inclined,
or air foil blades as scheduled.
2.
Welded steel housing with sloped cut-off plates, spun-steel or die formed inlet cone, and
welded steel supports.
3.
Statically and dynamically balanced within its own bearings with a maximum full
amplitude shaft deflection at bearings not to exceed 0.001 inch at 1200 rpm, grease
packed pillow block sealed bearings with not less than two pillow blocks per fan
assembly. L-10 bearing life of 80,000 hours minimum in accordance with AFBMA
standards.
D.
Motor: Integrally mounted, 1800 rpm maximum, with pre-lubricated sealed ball bearings. See
Section 230500, Common Work Results for HVAC, for further motor requirements.
E.
Drive: Sized for 150 percent of motor horsepower, cast iron adjustable sheaves, V-belt type,
sheaves statically and dynamically balanced, multiple belt drives on units over 2 hp. Metal
guard over drive, OSHA approved. Provide fixed sheaves on units over 5 hp. Replace fan
sheaves as necessary to obtain desired results. Include allowance for one sheave change for
fans with fixed sheaves.
F.
Provide vibration isolation as specified.
G.
Kitchen Hood Exhausters: Provide non-sparking wheel assembly, fully welded scroll, and
scroll drain units designed for use in kitchen hood applications.
H.
Provide fully welded scroll and scroll drains on fans subject to moist air streams.
I.
Fans exposed to weather shall have heavy gauge protective covers over bearings and shaft
assembly.
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J.
Provide fan outlets with removable angles and bolts for attaching flexible connections or
discharge dampers.
K.
Sound power level (re: 10-12 watts) at fan inlet and discharge when producing CFM at static
pressure shall not exceed the following in any octave band:
FAN
ID
2.2
63
Octave Band Center Frequency (HZ)
125
250
500
1000 2000
4000
8000
ROOF EXHAUST FANS
A.
Acceptable Manufacturers:
pre-bid approved equal.
B.
General Description: Provide curb-mounted centrifugal roof exhauster.
C.
Fans:
1.
Provide single-width, single-inlet, airfoil blades.
2.
Provide one piece heavy gauge spun aluminum construction, steel inlet bell, arranged for
curb mounting.
3.
Statically and dynamically balanced within its own bearings; grease packed pillow block
sealed bearings shall not have less than two pillow blocks per fan assembly.
D.
Motor: Integrally mounted, 1800 rpm maximum, with prelubricated sealed ball bearings.
Provide two speed motors where specified. See Section 230500, Common Work Results for
HVAC, for further motor requirements.
E.
Drive: Sized for 150 percent of motor horsepower, cast iron adjustable sheaves, V-belt type,
sheaves statically and dynamically balanced, with multiple belt drive on all units over 2 hp.
F.
Provide fan wheel and motor mounted on integral double deflection neoprene isolators.
G.
Accessories: Provide bird screen, gravity backdraft damper, disconnect switch under enclosure,
and roof curb compatible with roof construction. Greenheck GPI, or pre-bid approved equal.
2.3
Carnes, Penn, Greenheck, Jennaire, Cook, Acme, Briedert, or
PLUG FAN
A.
Acceptable Manufacturers: Pace, Tempmaster, Twin City Blower, Barry, Cook, Acme, or prebid approved equal.
B.
Description: Centrifugal plug fan, horizontal arrangement, with motor, drive, mounted on a
common welded steel base, AMCA rated.
C.
Fan: SWSI, Arrangement 1 airfoil blade wheel with inlet cone, statically and dynamically
balanced as an assembly, with a maximum full amplitude shaft deflection at bearings not to
exceed 0.001 inch at 1200 rpm.
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D.
Motor: 1800 rpm, with prelubricated sealed ball bearings, mounted on an adjustable steel base.
See Section 230500, Common Work Results for HVAC, for further motor requirements.
E.
Bearings: Spherical roller bearings, 80,000 hour L-10 life (AFBMA standard), factory
lubricated with easily accessible grease fittings.
F.
Drive: Multiple belt with fixed sheaves and OSHA approved metal guard. Size drive for
150 percent of motor horsepower.
G.
Vibration Isolation: Provide vibration isolation as specified.
H.
Nominal sound power level (re: 10-12 watts) at fan inlet and discharge when producing cfm at
static pressure shall not exceed the following in any octave band:
Octave Band Center Frequency (HZ)
FAN ID
AHU-_-___
AHU-_-___
2.4
Supply
Fan
Return
Fan
63
125
250
500
1000
2000
4000
8000
95
100
94
90
87
85
81
75
92
93
90
82
79
78
71
63
ROOF VENT
A.
Acceptable Manufacturers:
approved equal.
B.
Description: Heavy gauge galvanized steel, low silhouette, roll formed rib sections, exterior
baked enamel finish with interior gray prime coat, suitable for curb mounting, with bird screen
and natural aluminum mill finish.
C.
Accessories: Roof curb compatible with roof construction.
2.5
Carnes, Penn, Greenheck, Acme, Briedert, Cook, or pre-bid
INLINE CENTRIFUGAL FANS
A.
Acceptable Manufacturers: Greenheck BSQ, Penn, Cook, Acme, Carnes, or pre-bid approved
equal.
B.
Description: Inline centrifugal, belt driven, cabinet fan, AMCA rated, backward inclined wheel,
heavy gauge steel housing adequately braced with all edges sealed, externally mounted 1800
rpm motor, with hinged access doors and disconnect switch. Provide energy efficient motor as
specified. See Section 230500, Common Work Results for HVAC, for further motor
requirements.
2.6
PROPELLER FANS
A.
Acceptable Manufacturers: Greenheck, Pace, Carnes, Penn, Jennaire, Cook, Acme, Briedert,
American Coolair, Acme, Aerovent, or equal.
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B.
Description: Axial flow panel mounted sidewall propeller fan, belt drive, belt guard, OSHA
approved screens, and gravity backdraft damper, disconnect, supply or exhaust.
C.
Motor: 1800 rpm maximum, pre-lubricated, sealed ball bearings.
Common Work Results for HVAC, for further motor requirements.
D.
Drive: Sized for 150 percent motor horsepower, adjustable sheaves, V-belt drive.
2.7
See Section 230500,
PRESSURE BLOWERS
A.
Acceptable Manufacturers: American Fan, New York Blower, Acme, Cook, Joy, Penn
Ventilator, Twin City, or equal.
B.
Description: Non-sparking type pressure blower with motor and base, AMCA B construction.
C.
Wheel: Radial blade type impeller, spark resistant aluminum construction, statically and
dynamically balanced.
D.
Motor: ODP, pre-lubricated, sealed ball bearings, aluminum or steel base. See Section 230500,
Common Work Results for HVAC, for further motor requirements.
E.
Housing: Spark-resistant cast aluminum or steel construction, two-piece split housing, and nonferrous shaft seal to prevent motor shaft sparking.
F.
Vibration Isolation: Provide vibration isolation as specified.
G.
Bearings: Grease-packed pillow-block sealed bearings. L-10 bearing life of 50,000 hours
minimum in accordance with AFBMA standards.
H.
Drive: Sized for 150 percent of motor horsepower, cast iron fixed sheaves, multiple belt drives,
metal guard, and shall be OSHA approved. Replace fan sheaves as necessary.
I.
Accessories:
1.
Full cutoff blast gate, galvanized steel gate, cast aluminum housing, and thumbscrew
lock. Blast gates shall be required only where a single fan serves multiple vehicles for
balancing of ductwork.
2.
Flapper Cap Roof Termination: Heavy gauge aluminized steel, stack cover with
counterbalance, high temperature gasket hinge with brass busing, stainless steel
attachment band, and bolt. Hapco, or equal.
J.
Application: For use with vehicle exhaust extraction system.
PART 3 - EXECUTION
3.1
FLEXIBLE CONNECTIONS
A.
Provide flexible connections on all inlet and discharge duct connections.
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3.2
CENTRIFUGAL FANS
A.
Mount on isolator base on roof rails.
B.
Provide vented roof curb at roof penetration in accordance with NFPA 96.
3.3
ROOF EXHAUST FANS
A.
Mount fan on roof curb in accordance with the manufacturer’s recommendations. Anchor fan
to curb and curb to roof. Coordinate roof opening size and curb location.
B.
Connect ductwork.
3.4
PLUG FANS
A.
Install in accordance with the manufacturer’s instructions.
B.
Mount on isolators as specified.
C.
Lubricate bearings as recommended by the bearing manufacturer.
D.
Startup: After installation and before starting:
1.
Check fan isolation for freedom of motion.
2.
Statically and dynamically balance fan as an assembly, with a maximum full amplitude
shaft deflection at bearings not to exceed 0.001 inch at 1200 rpm.
3.
Engage the manufacturer to perform pre-startup and startup tasks.
3.5
ROOF VENTS
A.
Install curb on roof, flash and counter flash, and mount cap using lag screws for wood and
machine bolts for metal.
B.
Make ductwork connections.
3.6
INLINE CENTRIFUGAL FANS
A.
Mount in ductwork using vibration isolation as specified.
B.
Connect ductwork using flexible connections.
C.
Arrange for unobstructed access to access door.
3.7
PROPELLER FANS
A.
Mount fan where specified.
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3.8
PRESSURE BLOWERS
A.
Mount using vibration isolators and miscellaneous steel as required. Arrange mounting to resist
fan thrust and rotation.
B.
Make ductwork connections using flexible connections.
C.
Install flapper cap roof termination above roof.
Choose 3.9 or 3.10. Use 3.9 if Commissioning Section 019100 is included; otherwise use 3.10.
3.9
COMMISSIONING
A.
3.10
A.
Commission the systems, equipment, and components specified herein.
TESTING
Check out, start up, and test the systems, equipment, and components specified herein.
END OF SECTION 233400
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