OSUT_1_23_34_23_Power_Ventilators.pdf

OUST-IN RANGE PROJECTS

SECTION 23 34 23.00 40

POWER VENTILATORS

04/06

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)

ASCE/SEI 7 (2005; Supple 1) Minimum Design Loads for Buildings and Other Structures

ASTM INTERNATIONAL (ASTM)

ASTM A 653/A 653M (2004a) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM B 209 (2004) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

ASTM B 209M (2004) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate (Metric)

ASTM B 37 (2003) Standard Specification for Aluminum for Use in Iron and Steel Manufacturer

UNDERWRITERS LABORATORIES (UL)

UL 705 (2004; R 2005e6) Standard for Power Ventilators

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Installation Drawings shall be submitted for power roof ventilator in accordance with the paragraph entitled, "Installation," of this section.

Record Drawings shall be submitted for power roof ventilators in accordance with paragraph entitled, "General Requirements," of this section.

SD-03 Product Data

Equipment and Performance Data shall be submitted in accordance with paragraph entitled, "General Requirements," of this section.

Manufacturer's catalog data shall be submitted for the following items:

Housing Fan Motor Bases Roof Curbs Dampers Screens Sound Baffles

SD-06 Test Reports

Test reports shall be submitted for system operational tests in accordance with the paragraph entitled, "Tests," of this section.

1.3 GENERAL REQUIREMENTS

Section 23 00 00.00 40 GENERAL MECHANICAL PROVISIONS applies to work specified in this section.

Record Drawings shall be submitted for power roof ventilator providing current factual information such as deviations from, and amendments to, the drawings and concealed and visible changes in the work.

1.4 QUALITY ASSURANCE

Ventilators shall be rated and labeled in accordance with the applicable standards of the Air Movement Control Association, and shall be licensed to bear the AMCA seal for both air and sound.

PART 2 PRODUCTS

2.1 DESIGN AND FABRICATION REQUIREMENTS

Roof ventilators shall comply with UL 705 and be furnished complete with bases, curbs, flashing flanges, noise baffles, dampers, damper controls, louvers, and screens.

Ventilators shall be designed for windloads in accordance with ASCE/SEI 7 and in no case shall the installed design be for less than 80 miles per hour windload. Structural bracing shall be properly spaced to accommodate this loading and in accordance with the design requirements of the covering material. Ventilators shall be adequately reinforced and well braced with joints properly formed. Edges shall be wired or beaded where necessary to ensure rigidity. Galvanic action between different metals in direct contact shall be prevented by nonconductive separators. All soldering shall be even and smooth.

Bolts, rivets, and other fastenings used in connection with protected metal shall be corrosion-resistant steel.

2.2 HOUSING STYLE(S)

Power roof ventilator shall be vertical discharge style as indicated.

2.3 FAN TYPE(S)

Fan shall be of the following type(s):

2.3.1 Type C-PRV Centrifugal, Direct Drive

Type C-PRV ventilator shall be a centrifugal roof ventilator with direct drive, nonoverloading, backward-inclined wheel. Drive shall be vibration isolated with elastomer. Drive components shall be mounted in a compartment isolated from airstream.

2.3.2 OMITTED

2.3.3 Type P-PRV Propeller, Direct Drive

Type P-PRV ventilator shall be a propeller roof ventilator with direct drive and shall be vibration isolated with elastomer. Drive components shall be mounted in a compartment isolated from airstream.

2.3.4 OMITTED

2.3.5 OMITTED

2.3.6 OMITTED

2.3.7 OMITTED

2.3.8 OMITTED

2.4 MATERIALS

Materials shall be manufacturers' standard materials.

2.4.1 Aluminum Alloy

Aluminum alloy shall be in accordance with ASTM B 209 and ASTM B 37.

2.4.2 Zinc-Coated Steel

Zinc-coated steel shall be in accordance with ASTM A 653/A 653M.

2.4.3 Fibrous Glass

Fibrous glass ventilators shall be molded from a glass-fiber reinforced polyester resin with a pigmented polyester resin gel coat in manufacturer's standard color, and shall be not less than 0.51 or more than 1.53 millimeter thick. Matrix material shall have not less than 30 percent, by weight, of chopped-fiber and random-strand glass fibers, and shall be thoroughly saturated and impregnated with not more than 70 percent high-solids polyester resin with not less than 5-percent antimony trioxide fire-retardant additive. Material shall be smooth, dense, and uniform in texture, color, and cross section and shall be shatter-resistant, rigid, and free from visual defects, foreign inclusions, cracks, crazing, die lines, pinholes, striations, unsaturated and resin-poor areas, and excessive-resin areas.

2.5 FAN MOTOR

Belt drive motors smaller than 1/2 horsepower shall be single-phase, 120 volts, 60 hertz with permanently lubricated ball bearings and shall be split-phase type.

Motors 1/2 horsepower and larger shall be three-phase 460 volts, 60 hertz.

Motors shall have local disconnects to provide means for fan and motor maintenance. All motors shall be provided with thermal overload protection. Motors located in airstreams shall be totally enclosed type.

Direct drive motors 1/2 horsepower and smaller shall be of the energy efficient permanent split capacitor type, single phase, 60 hertz.

2.6 BASES

Bases provided with the ventilators shall be factory formed, of the type indicated, shall be the same material as the hoods, and the thickness necessary to meet the design requirement for connection to the roof. Bases shall be suitable for raised curb mounting where indicated. Curb flanges of the base shall be formed as cap flashing extending at least 2 inches over roofing base. Where indicated or required, shafts of ventilators shall be extended a sufficient distance through the supporting construction to permit attachment of vent ducts.

2.7 ROOF CURBS

Factory-formed metal ventilator curbs shall be of type and design required for the ventilator and suitable for roof configuration and flashing.

Job-built curbs shall conform to the recommendations of the ventilator manufacturer, shall be sized correctly for the ventilator, and shall be suitable for type of supporting roof construction.

2.8 BACK-DRAFT DAMPERS

Back-draft dampers shall be gravity operated with adjustable counterweight of the same material as fan housing.

2.9 SCREENS

Bird screens shall be provided with frames of the same material as that used in the ventilators and shall be securely attached in a manner that will permit easy removal for access and cleaning.

2.10 SOUND BAFFLES

Sound baffles shall be permanent construction and impervious to moisture.

Baffles shall be removable.

PART 3 EXECUTION

3.1 INSTALLATION

Power roof ventilators shall be installed in accordance with manufacturer's installation instructions. Installation of ventilators shall be properly coordinated with other work. Anchors, attachments, and other items to be built shall be coordinated for installation as the work progresses.

Ventilators shall be rigidly installed in a weathertight and watertight manner and shall be free from vibration. Refer to Section 23 05 48.00 40 VIBRATION ISOLATION FOR AIR CONDITIONING EQUIPMENT for vibration isolation considerations.

Installation Drawings shall be submitted for power roof ventilator in accordance with referenced standards in this section.

3.2 TESTS

After installation, each power roof ventilator shall be tested to demonstrate proper operation at indicated and specified performance requirements including running, balance, noise, and proper direction of fan rotation.

3.2.1 Vibration Analyzer

Contractor shall use an FFT analyzer to measure vibration levels. It shall have the following characteristics: A dynamic range greater than 70 dB; a minimum of 400 line resolution; a frequency response range of 5 Hz-10 KHz(300-600000 cpm); the capacity to perform ensemble averaging, the capability to use a Hanning window; auto-ranging frequency amplitude; a minimum amplitude accuracy over the selected frequency range of plus or minus 20 percent or plus or minus 1.5 dB.

An accelerometer, either stud-mounted or mounted using a rare earth, low mass magnet and sound disk(or finished surface) shall be used with the FFT analyzer to collect data. The mass of the accelerometer and its mounting shall have minimal influence on the frequency response of the system over the selected measurement range.

3.3 ACCEPTANCE

Prior to final acceptance, precision alignment devices shall be used to demonstrate that fan and motor are aligned as specified.

Prior to final acceptance, vibration analysis shall verify conformance to specifications. Vibration levels shall not be more than .075 in/sec at 1 times run speed and at fan/blade frequency, and .04 in/sec at other multiples of run speed.

3.4 LUBRICATION

Movable parts of dampers and related operating hardware shall be lubricated in accordance with manufacturer's printed instructions and shall operate smoothly and quietly without binding.

3.5 FINAL TEST REPORTS

Final test reports shall be provided to the Contracting Officer. Reports shall have a cover letter/sheet clearly marked with the System name, Date, and the words "Final Test Reports - Forward to the Systems Engineer/Condition Monitoring Office/Predictive Testing Group for inclusion in the Maintenance Database."

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