Amendment_2.pdf

NSN 7540-01-152-8070 STANDARD FORM 30. (Rev. 10-83) Previous Edition unusable Prescribed by GSA FAR (48 CFR) 53.243

Page of Pages AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. Contract ID Code

2. AMENDMENT MODIFICATION NO. 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (if applicable)

6. ISSUED BY CODE 7. ADMINISTERED BY (If other than item 6) CODE

(x) 9A. AMENDMENT OF SOLICITATION NO.

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NO.

8. NAME AND ADDRESS OF CONTRACTOR (NO., Street, Country, State and ZIP Code)

CODE FACILITY CODE

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in item 14. The hour and date specified for receipt of offers is extended, is not extended.

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

(a) By completing items 8 and 15, and returning ______ copies of amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OR OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment your desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

Check One

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return _______ copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible)

Except as provided herein, all terms and conditions of the document referenced in item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

15B. CONTRACTOR/OFFEROR 16B. UNITED STATES OF AMERICA

(Signature of person authorized to sign)

15C. DATE SIGNED

(Signature of Contracting Officer)

16C. DATE SIGNED

Continuation Page

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Continued from Block 14...

2) Add the following documents to Section J - Drawings.zip.

3) Make the following change to Section 12a of the 1442 page 1. The box hereby is checked as "Yes" (Contractor must furnish Performance and Payment Bonds) not as "No".

3) All questions pertaining to the solicitation must be submitted by 08/08/2014 by 2:00pm. Submit all questions to joshua.alderoty@nist.gov with the title "Questions for Mechanical IDIQ".

The due date for proposals remains unchanged.

Table of Contents

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SECTION J LIST OF ATTACHMENTS

J. 1 Initial Task Order Statement of Work - Updated

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SECTION J

LIST OF ATTACHMENTS

J. 1 Initial Task Order Statement of Work - Updated

Bldg. 302 Boiler Room Louver Replacement Statement of Work 7/9/2014

Project:ऀBLDG. 302 Boiler Room Louver Replacement

LOCATION:ऀBLDG. 302

COR: ऀJohn Filano

The upper and lower louvers in the boiler room of bldg. 302 are original to the building and need to be replaced. Due to numerous changes to the boiler plant over the years the upper louvers have become inaccessible. The upper louvers will be blocked off and new air intakes installed in the roof of bldg. 302. The lower louvers have failed over the years and also need to be replaced.

Objectives:

The objective is to obtain a Mechanical Contractor to remove the existing upper and lower louvers and replace them per the requirements of this contract.

Construction Contractor Requirements:

Provide construction services to perform necessary mechanical, fabrication, rigging, electrical, and piping work.

Construction statement of work:

The contractor shall provide all the necessary services, including labor, materials, equipment, supplies and supervision as necessary, but not limited to the following, to fulfill the requirements of this project.

Job Specific Safety Plan: The contractor shall submit a job specific safety plan prior to startup of work. Contractor to obtain a burn permit (x6190) prior to starting any hot work.

Roof Intakes: Furnish all labor and materials required to install eight (8) - 60” x 120” roof mounted hooded Gravity air intake hoods. Hoods to include roof curb, motor operated damper(s), and 120 volt motor operators (2 ea. Unit). Basis of design is Greenheck model FGI hooded gravity intake, Greenheck roof curb GPI-G18 with damper tray and liner, Greenheck VCD-23 low leakage dampers with drive arraignment Drive-CC-31-2FIL-2, and 120 volt Belimo motor operator model AFBUP. Note: actuator to be Belimo only, no substitutions. 120 volt power will be from existing circuits at junction boxes inside plant at column lines 15, 19, 20, 21, and 22. Note: junction boxes are approximately 26 feet above floor with moderate to difficult accessibility. Disconnect power inside JB to existing upper damper motors and abandon. Run new ¾” EMT conduit, with 2 #12 THHN and #12 ground or 12-2 w/g mc cable from JB to bottom of roof opening(s). Transition to liquid tight conduit and fittings for operators below opening and run to damper motors (2 each hood). Control of dampers will be from existing switches that previously controlled upper wall dampers, located on same columns about 4 feet above finish plant floor. Cut existing built up roof to

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accommodate new openings. Weld a length of 8 x 11.5 C channel to underside of roof on the one unsupported side of opening. Prime and paint white channel. Repair and seal roof water tight upon curb installation. Do not cut roof in more penetrations that can be sealed or protected from water or leaks in one work day. A crane will be required to move equipment to roof. Roof height is approximately 30 feet above ground level. Personnel access with be thru roof hatch/ladder from inside plant. Refer to drawing 302-492. Note: roof work must be finished before starting upper louver blank off panels.

Equipment specifications as follows:

1. Hooded gravity intake: throat width 60”, throat length 120”, curb cap width 66”, curb cap length 126”, base height 5”, Aluminum housing (not galvanized), aluminum bird screen ¾” x 1 ¼” diamond shape, ½” fiberglass hood insulation. Shipped in sections.

2. Roof curb: Galvanized construction (18 ga), cap width 66”, cap length 126”, flange width 68.5”, flange length 128.5”, height 18”, 1” x 3# density insulation with internal metal liner, damper tray 120” x 60”.

3. Control damper: Assembled size 120” x 60”, blade action parallel, frame type channel, material galvanized, axle material steel, axle bearing 304 SS, linkage material steel, blade seal TPE, jamb seal material 304 SS, frame thickness 16 ga., actuator mount internal, actuator location left side, fail position closed, pressure rating 0.5”wg, Velocity 3,000 fpm, leakage Class 1A @1“wg @ up to 5”wg.

4. Actuator: spring return, torque rating at rated voltage 180 in. lbs., timing- motor less than 75 seconds, spring timing- less than 20 seconds @-4° to 122° F, Nema 2 housing, power consumption running 7W, power consumption holding 3.5 W, voltage input 24 to 240

VAC.

All work shall be performed in accordance with applicable OSHA, NEC, ASHRAE, SMACNA, and NIST safety requirements. All roof workers shall be tied off with appropriate safety harness. Any work inside plant above 8 feet shall have appropriate safety harness and tied off.

Upper Louver Blank Off Panels: Furnish all labor and materials required to install 6mm (1/4”) aluminum composite metal wall panels on the east and west side of Building 302 to blank off the upper louvers. Refer to drawing 302-493 and attached specification section 07 42 43. On the west side of building, remove and dispose of, the five, 4’x8’x3/4 foam board panels and steel studs that were temporarily installed to blank off louvers. Personnel working off lift shall have appropriate safety harness and be tied off.

Remove Lower Louvers: Inside the boiler room, remove and dispose of the operable louvers (including rough buck frame), bird screens, motor operators, and blank off panels as shown on drawing 302-495. Note that accessibility will be moderate to difficult due to existing equipment, piping, etc. A site visit is strongly encouraged prior to bidding work.

Repair grout and thoroughly clean area inside wall openings. Furnish all labor and materials required to install new insect screens (outside) and new dampers and new Belimo operators inside. Fabricate and install flashing, angles, and close-off plates between areas of new dampers and existing louvers that are to remain. Caulk and seal all areas around new dampers and existing building. Refer to drawing 302-495 and 302-494. Note on Belimo motors: factory shipped with ½” shaft adapter, this will have to be removed to accept 1” jackshaft. Follow manufactures instructions.

Louver Controls: Furnish all labor and materials required to remove existing flexible metal conduit from existing junction box or rigid conduit that serves the existing motor damper

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operators and install new ½” flexible liquidtite conduit. Typically each run will be three feet or less. Remove the existing switches that serve both the upper and lower louvers (no other upper louver work except switch replacement on this contract) and install KO plugs.

Remove the existing finish buttons on JB cover and install new toggle switches. Use heat shrink or tape terminal ends. Install labels and identify which circuit is fed from and panel board (PB-1-E13). These switches are located on the columns between damper sections and are approximately 5 feet above finish floor (total of 20). Refer to attached picture. Use lock-out/tag-out procedures while performing work. Power is fed from panel PB-1-E13 inside boiler room west wall, east side circuits #11,13,15; west side #12,14,16.. Switch requirements: toggle switch, SPST, ON/OFF, 20A at 125V, switch function-maintained, UL listed.

All work shall be performed in accordance with applicable OSHA, NEC, ASHRAE, SMACNA, and NIST safety requirements.

Period of Performance/Schedule:

The following is the schedule for the 112 calendar days (16 weeks) to complete the project from Notice to Proceed:

1. Initial Meetingऀ0.0 week

2. Safety Planऀ1.0 week

3. Fabrication/Order Materialऀ8.0 weeks

4. Roof Intakesऀ3.0 weeks

5. Upper Louver Blank Off Panelsऀ1.5 weeks

6. Lower Louversऀ2.5 weeks

ऀऀTotalऀऀ16 weeks

Deliverables:

Deliver all submittals to John Filano, NIST, 100 Bureau Drive, Stop 1930, Building 302, Room A121, Gaithersburg, MD 20899-3511.

Safety plan submitted to NIST Plant Safety Office

Government Furnished Information:

The Government will provide the drawings/documentation for the project, as necessary. The contractor shall be responsible to verify those drawings against field conditions before starting the project. The contractor shall notify the COR of any discrepancies found in field during walk down of the project.

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Attachment: Composite Wall Panels

SECTION 07 42 43

COMPOSITE WALL PANELS

PART 1 GENERAL

1.1 ऀSECTION INCLUDES

1.A. ऀAluminum-faced composite panels, attachments and sealants.

1.2 ऀREFERENCES

2.A. ऀAmerican Society for Testing and Materials (ASTM) B209 - Aluminum and Aluminum-Alloy Sheet and Plate.

2.B. ऀAmerican Society for Testing and Materials (ASTM) C481 - Laboratory Aging of Sandwich Constructions.

2.C. ऀAmerican Society for Testing and Materials (ASTM) E72 - Standard Test Methods of Conducting Strength Tests of Panels for Building Construction.

2.D. ऀAmerican Society for Testing and Materials (ASTM) E84 - Surface Burning Characteristics of Building Materials.

2.E. ऀAmerican Society for Testing and Materials (ASTM) E283 - Rate of Air Leakage through Exterior Windows, Curtain Walls, and Doors.

2.F. ऀAmerican Society for Testing and Materials (ASTM) E289 - Linear Thermal Expansion of Rigid Solids with Interferometry.

2.G. ऀAmerican Society for Testing and Materials (ASTM) E330 - Structural Performance of Exterior Windows, Curtain Walls, and Doors.

2.H. ऀAmerican Society for Testing and Materials (ASTM) E331 - Water Penetration for Exterior Windows, Curtain Walls, and Doors.

2.I. ऀAmerican Society for Testing and Materials (ASTM) D1781 - Climbing Drum Peel for Adhesives.

2.J. ऀAmerican Society for Testing and Materials (ASTM) - Structural Performance of Exterior Windows, Curtain Walls, and Doors by Uniform Static Air Pressure Difference.

2.K. ऀAmerican Architectural Manufacturers Association (AAMA) 501 – Water Penetration using Dynamic Pressure.

2.L. ऀAmerican Architectural Manufacturers Association (AAMA) 605.2 - Voluntary Specification for High Performance Organic Coatings on Architectural Extrusions and Panels.

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2.M. ऀAmerican Architectural Manufacturers Association (AAMA) TIR-a11 - Maximum Allowable Deflection of Framing Systems for Building Cladding Components at Design Wind Loads.

1.3 ऀSYSTEM DESCRIPTION

3.A. ऀDesign Requirements:

3.A.1. ऀDesign system to accommodate movement of components without buckling, failure of joint seals, undue stress on fasteners, or other detrimental effects when subjected to temperature and humidity ranges reasonably anticipated.

3.A.2. ऀDesign system to accommodate tolerances of structure.

3.B. ऀPerformance Requirements:

3.B.1. ऀSubmit test data witnessed by an independent testing agency for the following requirements:

3.B.1.a. ऀStructural tests for wind loads by "Chamber Method" in compliance with ASTM E72.

3.B.1.a.1) ऀStandard test design loading: 20 psf (960 Pa) positive and negative wind load.

3.B.1.a.2) ऀDesign panel system to withstand code imposed design loads and a deflection limit of L/180 shall apply to positive load pressures only.

3.B.1.a.3) ऀDesign panel system to withstand code imposed design loads and a deflection limit of L/175 shall apply to positive load pressures only.

3.B.1.b. ऀAir Infiltration: 0.06 cfm per square foot (32 lps per square meter) air leakage under a static pressure of 1.56 psf (7.65 kg per square meter) when tested in accordance with ASTM E283.

3.B.1.c. ऀWater Penetration: No uncontrolled water penetration through the standard vertical panel and sealed joints at a static pressure of 6.24 psf (30.5 kg per square meter) when tested in accordance with ASTM E331.

1.4 ऀSUBMITTALS

4.A. ऀSubmit as specified under general contract provisions.

4.B. ऀManufacturer's data sheets on each product to be used, including:

4.B.1. ऀPreparation instructions and recommendations.

4.B.2. ऀStorage and handling requirements and recommendations.

4.B.3. ऀInstallation methods.

4.C. ऀShop Drawings: Not required.

4.D. ऀSelection Samples: For each finish product specified, two complete sets of color chips representing manufacturer's full range of available colors and patterns.

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4.E. ऀVerification Samples: For each finish product specified, two samples, minimum size 3 inches (76 mm) by 5 inches (128 mm) representing actual product, color, and patterns.

4.F. ऀQuality Assurance Submittals: Submit the following:

4.F.1. ऀTest reports: Certified test reports showing compliance with specified performance characteristics and physical properties.

4.F.2. ऀCertificates:ऀProduct certificates signed by manufacturer certifying materials comply with specified performance characteristics and criteria, and physical requirements.

1.5 ऀQUALITY ASSURANCE

5.A. ऀManufacturer Qualifications: Manufacturer capable of providing field service representation during construction, approving acceptable installer and approving application method.

5.B. ऀInstaller Qualifications:

5.B.1. ऀInstaller experienced in performing work of this section who has specialized in installation of work similar to that required for this project.

5.B.2. ऀPanel Installer shall assume responsibility for all components of the exterior panel system including, but not limited to attachment to sub-construction, panel to panel joinery, panel to dissimilar material joinery, and joint seal associated with the panel system.

5.C. ऀPre-installation Meetings: Conduct pre-installation meeting to verify project requirements, substrate conditions, manufacturer's installation instructions, and manufacturer's warranty requirements.

1.6 ऀDELIVERY, STORAGE, AND HANDLING

6.A. ऀStore panels horizontally, off-the-ground, in manufacturer's unopened packaging until ready for installation.

6.B. ऀExamine delivered materials upon receipt to insure that no damage has occurred during shipment. Store metal-faced composite wall panels horizontally, covered with a suitable weather tight and ventilated covering. Store metal-faced composite wall panels to ensure dryness, with a positive slope for drainage of water. Do not store metal-faced composite wall panels in contact with other materials that might cause staining, denting, or other surface damage. DO NOT allow storage space to exceed 120 degrees F (49 degrees C).

6.C. ऀStore and dispose of solvent-based materials, and materials used with solvent-based materials, in accordance with requirements of local authorities having jurisdiction.

1.7 ऀPROJECT CONDITIONS

7.A. ऀMaintain environmental conditions (temperature, humidity, and ventilation) within

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limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits.

1.8 ऀWARRANTY

8.A. ऀFinish Warranty: Commencing on Date of Substantial Completion.

8.A.1. ऀProvide 10-year written warranty with economy or standard finish color coated metal finish covering color fading, chalking, and film integrity.

8.A.2. ऀProvide 20-year written warranty with PVDF fluoropolymer finish color coated metal finish covering color fading, chalking, and film integrity.

8.A.3. ऀFinish coating shall not peel, blister, chip, crack or check.

8.A.4. ऀChalking, fading or erosion of finish measured by the following tests:

8.A.4.a. ऀFinish coating shall not chalk in excess of 8 numerical ratings when measured in accordance with ASTM D659.

8.A.4.b. ऀFinish coating shall not change color or fade in excess of 8 NBS units as determined by ASTM D2244.

8.B. ऀMaterial and Installation Warranty: Commencing on Date of Substantial Completion.

8.B.1. ऀWhen installed as directed by Laminators Incorporated, panels covered by this warranty are warranted not to delaminate (separate) at any Laminators produced glue line for a period of five years.

PART 2 PRODUCTS

2.1 ऀMANUFACTURERS

1.A. ऀAcceptable Manufacturer: Laminators Incorporated; 3255 Penn St., Hatfield, PA 19440. ASD. Tel: (215)723-8107. Toll Free: (877) OMEGA77. Fax: (215) 721-1239.

Shawn.crouthamel@laminatorsinc.com. Web: http://www.laminatorsinc.com

1.B. ऀSubstitutions: Approved equal.

2.2 ऀ ALUMINUM-FACED COMPOSITE PANELS

2.A. ऀOmega-Lite Composite Panels as manufactured by Laminators Incorporated.

2.A.1. ऀPanel Construction: Finished aluminum sheet over a corrugated polyallomer (CPA) core with backer sheet. Nominal 4’ x 8’ lengths.

2.A.2. ऀPanel Facing:

2.A.3. ऀPanel Backing:

2.A.4. ऀPanel Thickness:

2.A.5. ऀFire Test Performance: ASTM E84: Class A.

2.A.6. ऀBond Test Performance: ASTM C481-A Cyclic Aging: Pass.

2.A.7. ऀFinish:

2.A.8. ऀFinish Color:

2.B. ऀAluminum Composite Panel Installation System:

2.B.1. ऀInstallation:

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2.3 ऀACCESSORIES

3.A. ऀManufacturer's Sealants and Accessories: Provide manufacturer's recommended sealants and accessories for product installation. Silicon sealant shall be Pecora 890NST, color-Red Rock.

3.B. Trim: Corner, H, and J track molding to be extruded aluminum, sized to fit panel system.

3.C. Fasteners, exposed: #12-14 x 1” HWH TEK w/solid cup head & EDPM sealing washer. Painted top (color- terra cotta). Suggested vendor-http://www.bestmaterials.com.

3.D. Fasteners, concealed: #14-13 x 3 ½” or 4”, low profile pan head, coated roof deck screw. For attachment of molding extrusions to wood blocking: #6 x3/4”, low profile head.

3.E. Fasteners, masonry: Tapcon® 3/16 x 1 ¼”, 3/16 x 3 ¼” (blocking at column infill and end condition), flat head; UltraCon®, or equal. Note: countersink aluminum J track if required for panel clearance.

3.F. Pressure treated lumber: Exterior above ground, AWPA U1, Category UC3b.

2.4 ऀFABRICATION

4.A. ऀPanels shall be fabricated and finished as required to provide material construction and performance as specified and as required by manufacturer to comply with warranty provisions.

4.A.1. ऀTolerances: Length and Width: plus or minus 1/16 inch (1.6mm).

Squareness (Diagonals): equal within 1/8 inch (3.2mm).

PART 3 EXECUTION

3.1 ऀEXAMINATION

1.A. ऀDo not begin installation until substrates have been properly prepared.

1.B. ऀExamine substrates, areas, and conditions, with substrate installer present, for compliance with requirements for structural soundness, installation tolerances, metal panel supports, and other conditions affecting performance of work.

1.B.1. ऀExamine primary and secondary wall framing to verify that girts, angles, channels, studs, and other structural panel support members and anchorage have been installed within alignment tolerances listed below.

1.B.1.a. ऀ1/4 inch (6 mm) in any 20 feet (6 m) length vertically or horizontally.

1.B.1.b. ऀ1/2 inch (12 mm) in any building elevation.

1.B.2. ऀExamine solid wall sheathing to verify that sheathing joints are supported by framing or blocking and that installation is within flatness tolerances required.

1.B.3. ऀFor the record, prepare written report, endorsed by panel installer and

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substrate installer, listing remedy for conditions detrimental to performance of work.

1.C. ऀExamine roughing-in for components and systems penetrating metal panels to verify actual locations of penetrations relative to seam locations of metal panels before metal panel installation.

1.D. ऀProceed with installation only after all unsatisfactory conditions have been corrected.

1.E. ऀIf substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.

3.2 ऀINSTALLATION

2.A. ऀComply with manufacturer's installation guides and product data, including product technical bulletins, product catalog installation instructions, and product carton instructions for installation type selected.

2.B. ऀWork shall be done and completed in a thorough and workmanlike manner by mechanics skilled in their various trades.

2.C. ऀCaulk Installation:

2.C.1. ऀUse only approved sealants as described in Installation Guidelines and section 2.3 A..

2.C.2. ऀThe sealant manufacturer’s instructions shall be followed in preparing and installing sealants.

2.C.3. ऀJoints to receive sealant shall be clean, dry and free from dust, grit and contaminants.

2.C.4. ऀThe sealant shall completely fill the glazing pockets.

3.3 ऀFIELD QUALITY CONTROL

3.A. ऀManufacturer's Field Services: Upon Owner's request, provide manufacturer's field service consisting of product use recommendations and periodic site visit for inspection of product installation in accordance with manufacturer's instructions.

3.4 ऀCLEANING AND PROTECTION

4.A. ऀProtection: Protect installed product and finish surfaces from damage during construction.

4.B. ऀCleaning: Remove temporary coverings and protection of adjacent work areas.

Repair or replace damaged installed products. Clean installed products in accordance with manufacturer's instructions prior to owner's acceptance. Remove construction debris from project site and legally dispose of debris.

4.C. ऀProtect installed products until completion of project.

4.D. ऀTouch-up, repair or replace damaged products before Substantial Completion.

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END OF SECTION

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Attachment: Damper and Screen Specifications Basis of Design: TAMCO SERIES 1400 4" WIDE BLADE, AIR-FOIL CONTROL

DAMPER

14.0?Frames shall be 4" (101.6mm) deep x 1" (25.4 mm) and no less than .080" (2.03mm) in thickness, mill finish extruded aluminum (6063-T5) with mounting flanges on both sides of frame. Frame to be assembled using plated steel mounting fasteners.

14.1?Blades to be extruded aluminum (6063-T5) air-foil profiles. Blades are to be 4" wide and each blade seal shall extend only 0.2" (5.1mm) beyond the frame when in the full open position.

14.2?Blade seals shall be of extruded EPDM. Frame seals shall be extruded silicone. Seals are to be secured in an integral slot within the aluminum extrusions. Blade and frame seals are to be mechanically fastened to eliminate shrinkage and movement over the life of the damper.

Adhesive or clip-on type blade seals shall not be approved.

14.3?Maintenance-free bearings are to be composed of a Celcon inner bearing fixed to a 7/16" (11.11mm) aluminum hexagon blade pivot pin, rotating within a polycarbonate outer bearing inserted into the frame. There shall be no metal-to-metal or metal-to-plastic contact.

14.4?Adjustable 7/16" (11.11mm) hexagonal drive rod, U-bolt fastener and retaining nuts shall be hexagonal, corrosion-resistant, zinc-plated steel to provide positive connection to blades and linkage.

14.5?Linkage hardware shall be installed in the frame side and constructed of aluminum and corrosion-resistant, zinc-plated steel, complete with cup-point trunnion screws for a slip-proof grip.

14.6?Dampers are to be designed for operation in temperatures ranging between -40°F (-40°C) and 212°F (100°C).

14.7?Dampers shall be made to size required without blanking off free area.

14.8?Dampers shall be parallel blade action.

14.9?Dampers shall be provides as "Flanged to Duct" type (2” added to opening size).

14.10?Installation of dampers must be in accordance with manufactures current installation guidelines, provided with each damper shipment.

14.11?Acceptable product shall be TAMCO Series 1400 Air-Foil Control Damper with 4” wide blades, as manufactured by T. A. Morrison & Co., Inc. (Tel: 1-800-561-3449, USA & Canada) or equal.

14.12?Field measurements must be taken prior to ordering dampers. Design drawings show approximate dimensions and configurations. Actual field conditions may vary. It is the contractor’s responsibility to order the correct size for fit and function.

14.13?Damper Operator: Belimo model # AFBUP only. Power 120 volt AC. Mounting bracket- Belimo # ZG-103.

15.0?Horizontal Jack Shafts

15.1 ? Side and bridge brackets to be aluminum.

15.2 ? Blade clips to be die-formed 10 gauge CRs steel.

15.3 ? Shaft is 1" (25.4 mm) diameter solid steel rod.

15.4 ? Jack shaft and blade crank arms composed of stamped arms welded to machined collars.

15.5 ? All steel components to be zinc-plated.

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15.6 ? Medium-duty bronze bearings to be pre-greased and equipped with grease nipples.

15.7 ? Jack shafts to be pre-assembled and ready to mount in pre-drilled holes with provided fasteners.

15.8?Provide all required mounting accessories such as locking collars, 5/16” steel connecting rods, jack shaft crank arm and swivels.

Insect Screen Specifications Basis of Design: Tampco series 6000 insect screen

• Extruded aluminum (6063-T5) frame not less than .06” (1.52 mm) in thickness. Frame is 2.5” (63.5 mm) deep.

• Frame seals are extruded silicone. Seals are secured in an integral slot within the aluminum extrusions.

• Screen retention consists of roll-formed aluminum with silicone retainer gaskets.

• Insect screens are 18 x 14 woven rectangular mesh, 0.0090 diameter wire, 304 stainless steel, 72% open area.

• Face Removable screens to be ordered as Flanged to Wall mount type.

• ¼” (6.4 mm) is deducted from the opening dimensions to allow for clearance.

• Face removable screens are "lift and remove type" and come with nylon finger pulls, mounted in screen retention frame.

• Screens to be installed as standalone units.

• Installation of screens must be in accordance with manufacturer's installation guidelines.

Provide an additional 10 replacement screens.

Descript: The solicitation is amended as follows:

1) Update the Initial Task Order Statement of Work.

...See Continuation Page

100 BUREAU DRIVE STOP 1640

BUILDING 301 ROOM B129

GAITHERSBURG MD 20899-1640