P.O. Box 410
Schofield, WI 54476
Phone: 715.359.6171
www.greenheck.com

Product Specification Guide
Direct Drive High Plume Dilution Blower, Model Vektor-MD
Facility Service Subgroup: Division 23 HVAC (previously Division 15)

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Specifier Notes: This product specification guide is written according to the Construction Specifications Institute (CSI) Format.

This section must be carefully reviewed and edited by the Engineer to meet the requirements of the project and local building code.  Coordinate with other specification sections and the drawings.

Delete all unnecessary “Specifier Notes” when editing this section. 

Note to User: This document is subject to copyright protection and is proprietary to Greenheck Fan Corporation. However, Greenheck Fan Corporation authorizes the user a limited non-exclusive license to use this document or portions of it for the purpose of preparing written product specifications for the above CSI MasterFormat category.  All information in this document as provided by Greenheck Fan Corporation is informational in nature and is provided without representation or warranty of any kind as to the user or any other party, including, without limitation, ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, OR NON-INFRINGEMENT. To the greatest extent permitted by applicable law, Greenheck Fan Corporation assumes no liability, and User assumes all liability and risk, for the use or results from the use of this document or the information contained herein, whether as modified by the user or not. Users should consult www.greenheck.com to verify that this document represents the most current version.
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1.	GENERAL

1.1	WORK INCLUDED

A. 	High-Plume Dilution Laboratory Exhaust System, Model Vektor-MD

1.2	RELATED WORK 

A. 	All sections, drawing plans, specifications and contract documents.

1.3	REFERENCES

A.	ANSI/AMCA Standard 99-10, "Standards Handbook” 
B.	ANSI/AMCA Standard 204-05, "Balance Quality and Vibration Levels for Fans"
C.	ANSI/AMCA Standard 210-07, "Laboratory Methods of Testing Fans for Aerodynamic Performance Rating"
D.	AMCA Publication 211-05, "Certified Ratings Program - Product Rating Manual for Fan Air Performance"
E.	AMCA Standard 260-07, “Laboratory Methods of Testing Induced Flow Fans for Rating”
F.	ANSI/AMCA Standard 300-08, "Reverberant Room Method for Sound Testing of Fans"
G.	AMCA Publication 311-05, "Certified Ratings Program – Product Rating Manual for Fan Sound Performance"
H.	AMBA Method of Evaluating Load Ratings of Bearings ANSI-11 (r1999)
I.	ANSI/AMCA Standard 500-D-12, "Laboratory Methods of Testing Dampers for Rating"
J.	ANSI/AMCA Standard 500-L-12, "Laboratory Methods of Testing Louvers for Rating"
K.	SMACNA - Medium Pressure Plenum Construction Standard
L.	ANSI/AIHA Z9.5-2012 – Laboratory Ventilation
M.	ASHRAE - Laboratory Design Guide
N.	OSHA guideline 1910.212 – General requirements for Machine Guarding. (www.osha.gov)
O.	OSHA guideline 1910.219 – General requirements for guarding safe use of mechanical power transmission apparatus.  (www.osha.gov)
P.	OSHA guideline 1926.300 – General requirements for safe operation and maintenance of hand and power tools. (www.osha.gov)
Q.	UL Standard 705, “Power Ventilators”

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Specifier Notes:

	Fans with Sure-Aire Flow Monitoring selected shall include the following.

1.	Flow monitoring station shall monitor the pressure difference between the fan inlet and the smallest diameter of the inlet cone.
2.	Volumetric flow to be calculated from empirically derived formulas based on testing by the fan manufacturer.
3.	Flow monitoring station shall not use air restricting flow devices that reduce fan performance or create additional fan sound.
4.	Two (2) equidistantly spaced sensor orifices to be drilled in the smallest diameter of the inlet cone venturi. Flow tubes from each venturi sensor shall be extended to a termination location mounted on the fan housing.
5.	High-pressure flow port(s) shall be mounted in low velocity fan inlet. Flow ports from the high-pressure sensor shall extend to a termination location mounted on the fan housing.
6.	Termination location shall include a low-pressure connection, a high-pressure connection and a listing of the empirically determined flow rate coefficient.
7.	Flow monitoring station shall accurately measure the pressure differential to within +/- 3%.
8.	Flow monitoring station to be installed by the fan manufacturer as part of the standard fan assembly.
9.	Flow monitoring station to be supplied with electronics package that includes pressure transmitter and LCD digital readout.
10.	Material:
•	Tubing: black polyethylene, UV resistant, chemically inert tubing, interior and exterior (standard), Temperature range: -100 - 175°F (-73 - 80°C)
•	Tube Fittings: Stainless steel compression fittings, interior. Brass compression fittings, exterior

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1.4	QUALITY ASSURANCE

A.	Performance ratings: Conform to ANSI/AMCA Standards 210, 260 and 300. Fans must be tested in accordance with AMCA Publications 211, 260 and 311 in an AMCA accredited laboratory and certified for air and sound performance. Fan shall be licensed to bear the AMCA ratings seal for air performance (AMCA 210), sound performance (AMCA 300), and induced flow fan for high plume dilution blowers (AMCA 260). Manufacturers that are not licensed to bear the AMCA 210 and 260 ratings seal, must provide performance witness testing (at the manufacturer's expense), per paragraph 1.4.D.
B.	Classification for Spark Resistant Construction shall conform to ANSI/AMCA Standard 99.
C.	Each fan shall be vibration tested before shipping, as an assembly, in accordance with ANSI/AMCA Standard 204. Each assembled fan shall be test run at the factory at the specified fan RPM and vibration signatures shall be taken on the motor mounting plate in three planes - horizontal, vertical, and axial. The maximum allowable fan vibration shall be less than 0.08 in. /sec peak velocity; filter-in reading as measured at the fan RPM. This report shall be provided at no charge to the customer upon request. Test reports providing vibration levels in mils or not clearly identifying vibration levels in all three planes will not be accepted. Vibration testing at the blade pass area or elsewhere on fan housing, not accurately reflecting the vibration levels being experienced by the motor bearings, shall not be viewed as equivalent and the equipment rejected. 
D.	Manufacturers that do not comply with paragraph 1.4.A must also provide, at the owner and engineer's option and manufacturer's expense, witness testing of fan discharge and entrainment airflow, performed in an AMCA accredited laboratory, in accordance with AMCA 210 and 260. This test shall verify the critical and safety related dilution performance of the high plume dilution blower, as stated by the manufacturer.

1.5	SUBMITTALS

A.	Provide dimensional drawings and product data on each high-plume dilution laboratory exhaust fan assembly.
B.	Provide fan curves for each fan at the specified operation point with the flow, static pressure and horsepower clearly plotted.
C.	Provide nozzle velocity of exhaust fan, total exhaust flow, and discharge plume rise at specified wind velocity. Submitted plume rise values will be calculated using the ASHRAE Momentum Flux method. Submittals using outdated methods (Brigg’s equation) will not be accepted.
D.	Strictly adhere to QUALITY ASSURANCE requirements as stated in section 1.4 of this specification.

1.6	DELIVERY, STORAGE, AND HANDLING

A.	Deliver materials to site in manufacturer’s original, unopened containers and packaging, with labels clearly indicating manufacturer, material, products included, and location of installation.
B.	Store materials in a dry area indoor, protected from damage, and in accordance with manufacturer’s instructions. For long term storage, follow manufacturer’s Installation, Operation and Maintenance manual.
C.	Handle and lift fans in accordance with the manufacturer’s instructions. Protect materials and finishes during handling and installation to prevent damage. Follow all safety warnings posted by the manufacturer.

1.7	WARRANTY

A.	Submit, for Owner's acceptance, manufacturer's standard warranty document executed by authorized company official. Manufacturer's warranty is in addition to, and not a limitation of, other rights Owner may have under Contract Documents.
1.	The warranty of this equipment is to be free from defects in material and workmanship for a period of 12 months [24 or 36 months] from the purchase date. Any units or parts, which prove defective during the warranty period, will be replaced at the manufacturers’ option when returned to the manufacturer, transportation prepaid.
2.	Motor Warranty is warranted by the motor manufacturer for a period of one year. Should motors furnished prove defective during this period, they should be returned to the nearest authorized motor service station.

2. 	EQUIPMENT

2.1 GENERAL

A.	Base fan performance at standard conditions (density 0.075 Lb. /ft3).
B.	Each fan shall be direct driven in AMCA arrangement 4 according to drawings.
C.	Each fan to be equipped with 316 stainless steel lifting lugs for corrosion resistance.
D.	Fasteners exposed to corrosive exhaust shall be stainless steel.
E.	Curb cap shall be hot rolled steel [316 stainless steel] coated with corrosion resistant coating.
F.	Fan assemblies that use flexible connectors that can fail, and cause loss of laboratory containment shall not be acceptable.
G.	Base fan system assembly shall be designed for a minimum of 125 mph wind loading, without the use of guy wires.

2.15 CORROSION RESISTANT COATING

A.	All steel fan and system components (fan, nozzle, windband and plenum) shall be corrosion resistant coated with LabCoat™, a two-part electrostatically applied and baked, sustainable, corrosion-resistant coating system. Standard finish color to be RAL 7023, concrete grey.
All parts shall be cleaned and chemically prepared for coating using a multistage wash system which includes acid pickling to remove oxide, improving the coating bond to the substrate.
The first powder coat applied over the prepared surface shall be an epoxy primer. After application, the coating shall be heated to a gelatinous consistency (partial cure) at which time the second powder coat of polyester resin shall be electrostatically applied and then be cured simultaneously at a uniform temperature of 400°F (204°C).
The coating system shall not be less than a total thickness of 6 mils, shall not be affected by the UV component of sunlight (does not chalk), and have superior corrosion resistance to acid, alkali, and solvents. Coating system shall exceed 4000-hour ASTM B117 Salt Spray Resistance.
Note that 10-20 mil thick wet coating systems pollute the environment (air and water), and that these manually applied coatings are not uniform over the impeller surface and can cause fan imbalance and vibration.

2.2 FAN HOUSING AND OUTLET

A.	Fan housing to be aerodynamically designed with high-efficiency inlet, engineered to reduce incoming air turbulence.
B.	Fan housing shall be bifurcated allowing motor to be visually inspected without contacting or entering the contaminated airstream. Housing must be manufactured of welded steel or stainless and meet specification section 2.15 for corrosion resistant coating. No uncoated metal fan parts will be acceptable.
C.	Fan housings that are fabricated of polypropylene or fiberglass that have lower mechanical properties than steel, have rough interior surfaces in which corrosive, hazardous compounds can collect, and / or which chalk and structurally degrade due to the UV component of the sunlight shall not be acceptable.
D.	A multi-stage air induction discharge nozzle shall be supplied by the fan manufacturer designed to efficiently handle an outlet velocity of up to 7000 FPM. The multi-stage nozzle shall induce ambient air up to 270% of fan capacity. Nozzles that are manufactured by third party vendors or that are fabricated of plastic or resins, having mechanical properties less than steel shall not be acceptable. Air induction performed by secondary fan with high tipping point shall provide certified and stamped FEA (finite element analysis) calculations of entire system withstanding a force equivalent to 125 mph wind loading. This calculation to include recommended guy wires and anchorage for safely securing assembly to roof deck. Recommended guy wires and anchorage shall be provided by fan manufacturer.
E.	Fan shall include aluminum windband coated with Hi-Pro Polyester coating. Windband to focus and direct entrainment air into the same airstream as the exhaust effluent. Windbands that are fabricated of polypropylene or fiberglass that have lower mechanical properties than steel, have rough interior surfaces in which corrosive, hazardous compounds can collect, and / or which chalk and structurally degrade due to the UV component of the sunlight shall not be acceptable.
F.	An integral fan housing drain shall be used to drain rainwater when the fan is de-energized.
G.	Inlet cone shall be provided with multiple tap piezometric ring to determine airflow through fan housing. Pressure ports shall be run to the exterior of the fan housing and terminated at common location. Fans with aftermarket invasive flow measuring probes, and not manufactured by the fan manufacturer, that are located in airstream decreasing fan performance or becoming clogged are not acceptable. Flow calibration constants shall have been derived through testing impeller and housing in AMCA licensed and certified air chamber. 
H.	Housing shall include cover plate providing additional weather protection to motor. Systems without motor cover plate shall provide a motor with wash-down duty rated enclosure.
I.	A bolted & gasketed access door shall be supplied for impeller inspection and service.
J.	Fan assembly shall be constructed to AMCA type B spark resistant construction as standard with aluminum or non-ferrous impeller and aluminum rub ring to reduce sparking in the event of a motor bearing or shaft failure. Manufactures submitting on spark resistance type C with non-ferrous inlet cone are not acceptable.

2.3	FAN IMPELLER

A.	Fan impeller shall be mixed flow design with non-stall characteristics. The impeller shall be electronically balanced both statically and dynamically exceeding AMCA Standards.
B.	Fan impeller shall be manufactured of aluminum. Impeller shall be coated with 2 - 3 mils dft of chemically resistant Hi-Pro Polyester resin, electrostatically applied and baked. Manufacturers not submitting with impellers that are aluminum shall provide motor bearing life calculations by the motor vender indicating motor bearing life in excess of L(10) of 100,000 hrs as applied in a vertical shaft down orientation. This calculation will be provided for each different motor and impeller combination listed on the schedule.
C.	Fan impellers that are fabricated of polypropylene or fiberglass that have lower mechanical properties than aluminum, and lower maximum tip speeds are not acceptable.

2.4 BYPASS AIR PLENUM

A.	The plenum shall be constructed of welded and coated steel and meet specification section 2.15 for corrosion resistant coating. Plenums that are fabricated of plastics or resins that are combustible and have mechanical properties less than steel shall not be acceptable.
B.	Fan designs that use inlet flexible connectors that can leak causing loss of lab exhaust shall not be permitted.
C.	Bypass air damper(s) shall be opposed-blade design for airflow control, airfoil design, fabricated of galvanized steel [304 stainless steel] for structural rigidity as standard.  Bypass damper(s) shall have plated steel damper rods, stainless steel sleeved bearings, 301 stainless steel jamb seals and the blades shall have polymer edge seals. Damper blade drive linkage shall be set by manufacturer and welded to eliminate linkage slippage. All damper access and service (drive actuators) shall be performed outside of the contaminated airstream. Dampers shall have maximum leakage of 4 cfm/ sq. ft. @ 1 in. wg, Air performance and leakage testing conducted in accordance with AMCA Standard 500-D.
D.	Fan isolation damper(s), shall be parallel-blade design, airfoil design, fabricated of steel [304 stainless steel construction] for structural rigidity as standard. Damper(s) shall be coated with 2 - 3 mils of chemically resistant Hi-Pro Polyester resin, electrostatically applied and baked. Isolation damper(s) shall have plated steel damper rods (if specified as 304 stainless steel damper, stainless steel damper rods will be provided), stainless steel sleeved bearings, 301 stainless steel jamb seals and the blades shall have polymer edge seals. Damper blade drive linkage shall be set by manufacturer and welded to eliminate linkage slippage. Dampers shall have maximum leakage of 4 cfm/ sq. ft. @ 1 in. wg, Air performance and leakage testing conducted in accordance with AMCA Standard 500-D. Pressure drop from the isolation damper to be included in submittal information and clearly shown in the total static pressure as this is impacts sizing and select of motor horsepower. Manufactures that do not include or indicate losses from the isolation damper shall include an additional 0.4 inches wg. to the scheduled pressure to account this loss.
E.	All isolation damper access and service (drive actuators) shall be performed outside of the contaminated airstream. Isolation damper be installed on twin tracks allowing damper to be removed from the side of the plenum Exhaust systems that require entry into the contaminated plenum to view, service or replace the isolation damper shall not be acceptable. 
F.	Isolation damper actuator(s) if scheduled shall be factory mounted and shall be wired to a step-down transformer. Actuator and transformer are located in a weatherproof enclosure.
G.	Blower / Plenum vibration isolation shall be limited to EPDM closed cell foam tape.

2.5 ROOF CURB

A.	The bypass air plenum or fan shall be mounted on factory fabricated roof curb provided by the fan manufacturer, as shown on the project drawings. 
B.	Exhaust system manufacturer shall supply a structural support curb for the plenum of specified height as shown on the drawings.
C.	Curb shall be fabricated of a minimum of 12-gauge corrosion-resistant coated steel and structurally reinforced. Curb shall be coated meeting specification section 2.15 for corrosion resistant coating. No uncoated metal roof curb parts will be acceptable.
D.	Curb shall be insulated with minimum of one inch of fiberglass insulation.
E.	When properly anchored to the roof structure, the standard curb / plenum / blower assembly shall withstand wind loads of up to 125 mph without additional structural support. Roof curbs not manufactured by the fan manufacturer shall provide a PE stamped certification, by a licensed structural engineer in the state where system is being installed, that the roof curb is designed and constructed to withstand weight load and lateral forces equivalent to 125 mph wind load to the total fan assembly. This documentation is required for each combination of fan size and qualities listed on project schedule.

2.6 FAN MOTOR AND DRIVE

A.	Motors shall be standard NEMA frame, EISA premium efficiency for 1200 and 1800 RPM or energy efficient for 900 RPM, TEFC enclosure with a 1.15 service factor for across the line operation or 1.0 service factor when used with variable frequency drive (VFD). A factory-mounted NEMA 3R [NEMA 4X] disconnect switch shall be provided for each fan.
B.	Motor shall be manufactured to be compatible for use with a VFD. Motor shall include a motor manufacturer mounted shaft grounding brush to protect the motor bearings and dissipate voltages and currents built up on motor shaft.
C.	Motor maintenance shall not be required for a period of over 1 year of continuous operation. Calculation of lubrication of motor shall be based on vertical shaft down motor orientation, weight of impeller, running time of 24 hours per day and thrust load created through air movement. Lubrication shall be limited to the motor bearings.
D.	Motor mounting shall be “C-face” and foot mounted for reduced vibration being transferred to the fan housing.
E.	Drive arrangement shall be AMCA arrangement 4, utilizing a tapered bushing connecting the motor shaft to impeller. Belt drive arrangement 9 is not acceptable.
F.	All non-permanently lubricated motors shall have nylon [stainless steel braided] extended lube lines with zerk fittings.

3.  EXECUTION

3.1	EXAMINATION

A.	Examine areas to receive fans. Notify the Engineer of conditions that would adversely affect installation or subsequent utilization and maintenance of fans. Do not proceed with installation until unsatisfactory conditions are corrected.

3.2	INSTALLATION

A.	Install fan systems as indicated on the contract drawings.
B.	Pipe housing drain to nearest drain.
C.	Install fans in accordance with manufacturer's Installation, Operation and Maintenance manual.

4. ACCEPTABLE MANUFACTURERS

A.	Greenheck Fan Corporation, PO Box 410, Schofield WI 54476-0410, www.greenheck.com
	Model Vektor-MD, Direct Drive High Plume Dilution Blower