Addendum 4--RFP-KTHFS-2026-003--Chiloquin Fitness Ctr Expansion--2026-10-02.pdf

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 1

KLAMATH TRIBAL HEALTH & FAMILY SERVICES

3949 S. 6th St.

Klamath Falls, OR 97603

Addendum #4

Project: RFP-KTHFS-2026-003

CHILOQUIN FITNESS CENTER EXPANSION PROJECT

FINAL DATE FOR RFP QUESTIONS:

Thursday, October 1, 2026 @ 12:00 p.m.

SUBMISSION DEADLINE: Wednesday, October 7, 2026

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 2

Table of Contents

Summary 3

Addendum 4 Updates 5

Section 23 33 00 – Air Duct Accessories 6

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 3

SUMMARY

1. PROJECT

1.1 Project Name: RFP-KTHFS-2026-003 – Chiloquin Fitness Center Expansion Project.

1.2 The project consists of the construction of a 20,000+ SF addition to the existing KTHFS

Fitness Center in Chiloquin, Oregon. The project consists of a community room, a workout room, teaching kitchen, a wellness center, a smoothie bar, and additional offices, restrooms, and showers.

2. DESCRIPTION OF ALTERATIONS WORK

2.1 KTHFS will remove the following items before the start of work:

2.1.1 Existing FFE and fitness equipment in existing rooms that are part of the scope of work.

3. WORK BY KTHFS

3.1 Items noted not in contract (NIC) will be supplied and installed by KTHFS before the date of substantial completion. Some items include:

3.1.1 Moveable cabinets.

3.1.2 Furnishings.

3.1.3 Small equipment

3.1.4 Rugs.

3.1.5 Plateware, silverware, glassware, cooking vessels, linens.

3.1.6 Copiers, office supplies

3.2 KTHFS will supply the following for installation by the supplier of the equipment

3.2.1 All furnishings, furniture, and moveable equipment

3.2.2 Exercise equipment, sauna, cold plunge, weights, red light therapy, tables.

3.2.3 Kitchen appliances, ice machine, commercial style dishwasher, coolers and freezers, ranges, etc.

3.2.4 Restroom accessories, dispensers (i.e., soap dispensers, towel dispensers, seat protection dispensers, feminine hygiene dispensers, toilet paper dispensers

3.2.5 Artwork or wall-mounted equipment

3.2.6 Health assessment equipment

3.2.7 If an item is not attached to the structure, KTHFS is providing unless noted otherwise.

4. OWNER OCCUPANCY

4.1 KTHFS intends to continue to occupy adjacent portions of the existing building during the entire construction period. Maintain all exits from the existing facility.

4.2 Cooperate with KTHFS to minimize conflict and to facilitate KTHFS operations.

5. CONTRACTOR USE OF SITE AND PREMISES

5.1 Construction operations: Limited to areas noted on drawings.

5.1.1 Locate and conduct construction activities in ways that limit disturbance to site.

5.2 Arrange use of site and premises to allow:

5.2.1 Owner occupancy.

5.2.2 Work by others.

5.2.3 Work by KTHFS.

5.3 Provide access to and from site as required by law and/or by KTHFS:

5.3.1 Emergency Building Exits During Construction: Keep all exits required by code open during construction period; provide temporary exit signs if exit routes are temporarily altered.

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 4

5.3.2 Do not obstruct roadways, sidewalks, or other public ways.

5.4 Utility outages and shutdown:

5.4.1 Limit disruption of utility services to hours the site is unoccupied.

5.4.2 Do not disrupt or shut down life safety systems, including but not limited to fire sprinklers and fire alarm systems, without seven (7) business day notice to KTHFS and authorities having jurisdiction.

5.4.3 Prevent accidental disruption of utility services or other facilities.

6. WORK SEQUENCE

6.1 Coordinate construction schedule and operations with KTHFS Facilities/Security Director and KTHFS Health Project Manager.

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 5

ADDENDUM NO. 004

TO ALL PLAN HOLDERS:

This Addendum forms a part of the Contract Documents and modifies the original bidding documents released for bid preparation. Please notify everyone concerned as your sub-contractors and suppliers of the issuance and contents of this addendum prior to date of bid opening.

THE FINAL DATE RFP QUESTIONS WILL BE ACCEPTED IS THURSDAY, OCTOBER 1, 2026, AT 12:00 P.M.

QUESTIONS AND CLARIFICATIONS:

Q1: Spec 23 33 00 Air Duct Accessories, 2.08, D references spec section 23 09 00 Instrumentation and

Controls for HVAC as regards actuators for control dampers (BD-1. ZD-1, ZD-2, ZD-3). I am not finding that spec section in the book. Can this be provided?

A1: All controls are packaged on this project so spec section 23 09 00 Instrumentation and Controls for HVAC is irrelevant and the reference has been removed.

Q2: I noticed the altitude is up to 5000’, was this altitude taken into consideration when sizing the generators? Or are you looking for us to upsize and derate our gens based on that elevation and kW provided in the spec?

A2: No need to upsize and derate generators.

Q3: The one-line has the 2000A ATS as NEMA 3 but the spec indicates NEMA 1. Could you please confirm which is needed for the application?

A3: NEMA 3R is required.

Q4: 100KAIC is specifically called out for the 2000A ATS. Is this accurate or is 65kAIC acceptable for the

2000A ATS?

A4: No, ATS must be 100kAIC.

Q5: At both projects there is an RTU which uses a zoning system, but no control protocol or system is identified in the specifications. Please have the design team identify the controls to be used for the systems that incorporate zone dampers.

A5: We would recommend Prolon for any VVT controls, but we don’t have a spec or sequence for this as it is standard off the shelf equipment. This would be by the mechanical subcontractor with whichever equipment they submit.

Q6: The subcontractors for Data are saying they don’t see any specs for Data outlets and the legend calls for rough-in only. Could you clarify if we need to include Cat 6 installation and termination in our proposal?

A6: We are showing rough-in only, no CAT6 cabling or terminations. The cabling and terminations are done by KTHFS or KTHFS vendor for their systems.

SPECIFICATIONS:

Reference: Description:

Section 23 33 00 Air Duct Accessories Addendum #4 (REPLACED)

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 6

SECTION 23 33 00 – AIR DUCT ACCESSORIES

1. PART 1 – GENERAL

1.1. Summary

1.1.1. Work included: Provision of materials, installation, and testing of:

1.1.1.1. Sheet Metal Materials

1.1.1.2. Backdraft Dampers

1.1.1.3. Dampers

1.1.1.4. Access Doors

1.1.1.5. Duct Test Holes

1.1.1.6. Dynamic Fire Dampers

1.1.1.7. Control Dampers

1.1.1.8. Turning Vanes

1.1.1.9. Flexible Connectors

1.2. Related requirements

1.2.1. Contents of Division 23 and Division 01, General Requirements apply to this Section.

1.3. References and standards

1.3.1. Reference and Standards as required by Section 23 00 00 and Division 01, General

Requirements.

1.4. Submittals

1.4.1. Submittals as required by Section 23 00 00 and Division 01, General Requirements.

1.4.2. In addition, provide:

1.4.2.1. Manufacturer’s catalog data and fabrication/installation drawings for each factory fabricated duct accessory. Include leakage, pressure drop, and maximum back pressure data.

1.4.2.2. Shop Drawings: Indicate air duct accessories.

1.4.2.3. Manufacturer’s Installation Instructions: Provide instructions for each factory fabricated duct accessory.

1.4.2.4. Maintenance Materials: Furnish the following for KTHFS use in maintenance of project.

1.4.2.4.1. See Section Division 01 Product Requirements, for additional provisions.

1.4.2.4.2. Extra Fusible Links: One for each type and size.

1.5. Quality Assurance

1.5.1. Quality assurance as required by Section 23 00 00 and Division 01, General Requirements.

1.5.2. In addition, meet the following:

1.5.2.1. Manufacturer Qualifications: Company specializing in manufacturing the type of products specified in this section, with minimum five years of documented experience.

1.5.2.2. Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc. as suitable for the purpose specified and indicated.

1.5.2.3. AMCA 500 - Test Methods for Louvers, Dampers and Shutters.

1.5.2.4. AMCA 511 - Certified Ratings Program for Air Control Devices.

1.5.2.5. NFPA 90A - Installation of Air Conditioning and Ventilating Systems.

1.5.2.6. NFPA 101 - Life Safety Code.

1.5.2.7. UL 555 - Standard for Safety; Fire Dampers.

1.6. Warranty

1.6.1. Warranty of materials and workmanship as required by Section 23 00 00 and Division

01, General Requirements.

2. PART 2 – PRODUCTS

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 7

2.1. Manufacturers

2.1.1. Backdraft Dampers:

2.1.1.1. Ruskin CB D6

2.1.1.2. Greenheck

2.1.1.3. Nailor

2.1.1.4. Or approved equivalent.

2.1.2. Dampers:

2.1.2.1. Ruskin

2.1.2.2. Greenheck

2.1.2.3. Nailor

2.1.2.4. Or approved equivalent.

2.1.3. Access Doors:

2.1.3.1. Ductmate

2.1.3.2. Ruskin

2.1.3.3. Nailor

2.1.3.4. Or approved equivalent.

2.1.4. Dynamic Fire Dampers:

2.1.4.1. Ruskin

2.1.4.2. Greenheck

2.1.4.3. Nailor

2.1.4.4. Or approved equivalent.

2.1.5. Control Dampers:

2.1.5.1. Prolon.

2.1.5.2. Or approved equivalent.

2.1.6. Turning Vanes:

2.1.6.1. Aerodyne

2.1.6.2. Ductmate Industries

2.1.6.3. Duro Dyne Corp

2.1.6.4. Metalaire Inc.

2.1.6.5. Ward Industries

2.1.6.6. Or approved equivalent.

2.1.7. Flexible Connectors:

2.1.7.1. Duro Dyne Corp.

2.1.7.2. Ventfabrics Inc.

2.1.7.3. Ward Industries

2.1.7.4. Or approved equivalent

2.2. Sheet Metal Materials

2.2.1. Comply with SMACNA's "HVAC Duct Construction Standards--Metal and Flexible" for acceptable materials, material thicknesses, and duct construction methods, unless otherwise indicated.

2.2.2. Galvanized Sheet Steel: Lock-forming quality; complying with ASTM A 653/A 653M.

Galvanizing: 1-1/4 ounces per square foot total both sides; ducts to have mill-phosphatized finish for surfaces exposed to view.

2.2.3. Reinforcement Shapes and Plates: Galvanized-steel reinforcement where installed on galvanized sheet metal ducts; compatible materials for aluminum and stainless-steel ducts.

2.2.4. Tie Rods: Galvanized steel, 1/4-inch minimum diameter for lengths 36-inches or less;

3/8-inch minimum diameter for lengths longer than 36-inches.

2.3. Backdraft Dampers

2.3.1. Basis-of-Design: Ruskin CB D6.

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 8

2.3.2. Description: Multiple-blade gravity balanced with center pivoted blades with sealed edges, assembled in rattle free manner with 90-degree stop, adjustment device to permit setting for varying differential static pressure.

2.3.3. Frame: 0.125-inch thick 6063-T5 extruded aluminum channel with galvanized steel braces at mitered corners. Provide mounting flange.

2.3.4. Blades: Single piece, overlap frame, parallel action, horizontal orientation, minimum.070-inch 6063-T5 extruded aluminum material, maximum 6-inch width.

2.3.5. Bearings: Corrosion-resistant synthetic, formed as single piece with axles.

2.3.6. Blade Seals: Extruded vinyl, mechanically attached to blade edge.

2.3.7. Blade Axles: Corrosion-resistant, synthetic formed as single piece with bearings, locked to blade.

2.3.8. Tie Bars and Brackets: Galvanized steel.

2.3.9. Return Spring: Adjustable tension.

2.3.10. Damper Capacity:

2.3.10.1. Closed Position: Maximum back pressure of 16-inches water gauge.

2.3.10.2. Open Position: Maximum air velocity of 2,500-feet per minute.

2.3.11. Counterbalances: Adjustable zinc plated steel weights mechanically attached to blade.

Must be capable of operating over wide range of pressures.

2.3.12. Finish: Mill aluminum.

2.3.13. Temperature Rating: -40 degrees F to 200 degrees F.

2.3.14. Operation of Blade:

2.3.14.1. Start to Open: 0.01-inch wg

2.3.14.2. Fully Open: 0.05-inch.

2.3.15. Pressure Drop: Maximum 0.15-inch wg at 1,500-feet per minute through 24-inch by 24-inch damper.

2.3.16. Factory Sleeve: Minimum 20 gauge thickness, 12-inches in length.

2.3.17. Screen: At outdoor intake or discharge. 1/4-inch aluminum.

2.4. Dampers

2.4.1. Basis-of-Design: Ruskin MD35 (rectangular).

2.4.2. General Description: Factory fabricated, with required hardware and accessories. Stiffen damper blades for stability. Include locking device to hold single-blade dampers in a fixed position without vibration. Close duct penetrations for damper components to seal duct consistent with pressure class.

2.4.2.1. Pressure Classes of 3-Inch wg (750 Pa) or Higher: End bearings or other seals for ducts with axles full length of damper blades and bearings at both ends of operating shaft.

2.4.3. Rectangular Volume Dampers: Multiple- or single-blade, parallel- or opposed-blade design with linkage concealed in frame and suitable for horizontal or vertical applications.

2.4.3.1. Steel Frames: Hat-shaped, galvanized sheet steel channels, minimum 16 gauge thick, with mitered and welded corners; frames with flanges where indicated for attaching to walls and flangeless frames where indicated for installing in ducts.

2.4.3.1.1. Roll-Formed Steel Blades: 16 gauge thick, galvanized sheet steel.

2.4.3.1.2. Aluminum Frames: Hat-shaped, 10 gauge thick, aluminum sheet channels;

frames with flanges where indicated for attaching to walls; and flangeless frames where indicated for installing in ducts.

2.4.3.1.3. Roll-Formed Aluminum Blades: 10 gauge thick aluminum sheet.

2.4.3.1.4. Extruded-Aluminum Blades: 16 gauge thick extruded aluminum.

2.4.3.1.5. Blade Axles: Minimum 1/2-inch diameter, plated steel, hex shaped, mechanically attached to blade.

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 9

2.4.3.1.6. Bearings: Molded synthetic sleeve, turning in extruded hole in frame.

2.4.3.1.7. Tie Bars and Brackets: Galvanized steel.

2.4.3.1.8. Mill galvanized.

2.4.3.1.9. Capacity:

2.4.3.1.9.1. Closed Position: Maximum pressure of 3-inches wg

2.4.3.1.9.2. Open Position: Maximum air velocity of 1,500-feet per minute across

24-inch by 24-inch damper.

2.4.4. Round Volume Dampers: Single-blade suitable for horizontal or vertical applications.

2.4.4.1. Steel Frames: Galvanized, roll formed, minimum of 20 gauge thick with beads at each end.

2.4.4.2. Blades: Minimum 20 gauge thick, galvanized sheet steel, round, single-piece.

2.4.4.3. Aluminum Frames: Minimum 10 gauge thick aluminum sheet.

2.4.4.4. Aluminum Blades: Minimum 10 gauge thick aluminum sheet.

2.4.4.5. Extruded-Aluminum Blades: Minimum 16 gauge thick extruded aluminum.

2.4.4.6. Blade Axles: Minimum 3/8-inch square, plated steel, mechanically attached to blade.

2.4.4.7. Bearings: Molded synthetic sleeve, turning in hole in frame.

2.4.4.8. Finish: Mill galvanized.

2.4.4.9. Capacity:

2.4.4.9.1. Closed Position: Maximum pressure of 3-inches wg

2.4.4.9.2. Open Position: Maximum air velocity of 1,500-feet per minute.

2.4.4.10. Leakage: Maximum 40 cfm at 1-inch wg for 20-inches diameter damper.

2.4.4.11. Pressure Drop: Maximum 0.02-inch wg at 1,500-feet per minute through 20-inch diameter dampers.

2.4.5. Jackshaft: 1-inch diameter, galvanized-steel pipe rotating within pipe-bearing assembly mounted on supports at each mullion and at each end of multiple-damper assemblies.

2.4.5.1. Length and Number of Mountings: Appropriate to connect linkage of each damper in multiple-damper assembly.

2.4.5.2. Damper Hardware: Zinc-plated, die-cast core with dial and handle made of

3/32-inch thick zinc-plated steel, and a 3/4-inch hexagon locking nut. Include center hole to suit damper operating-rod size. Include 2” elevated platform for insulated duct mounting.

2.4.6. Concealed Damper Hardware: For dampers above non-removable ceilings (gyp, plaster, decorative, etc.) where access panels have not been shown on Architectural drawings or in locations where dampers are more than 2-feet above the ceiling, provide:

2.4.6.1. Concealed Damper Regulator: Young Regulator Company Model 315 or approved equivalent.

2.4.6.2. Cable System: Young Regulator Company or approved equivalent.

2.4.6.3. Controller: Young Regulator Company 270-275 or approved equivalent.

2.4.6.4. Control wrenches, wire stops, casing nuts, and stainless steel wire.

2.4.6.5. Paint cover plate to match ceiling color or as directed by Architect.

2.5. Access Doors

2.5.1. Duct Pressure Class 2-inch WC and Greater: Sandwich-type design with threaded locking bolt assembly. Closed cell neoprene gasket permanently bonded to inside panel. Zinc-coated steel wing nuts or polypropylene molded knobs with threaded metal inserts -zinc coated bolts sealed to inner panel.

2.5.2. Duct Pressure Class 1-½-inch WC and Less: Galvanized steel assembly incorporating frame, door, hinges, and latch(es). Frame tabbed for attachment to duct panel. Double wall door panel with 1-inch insulation. Open cell neoprene gasket attached to frame.

Cam latches for tight closure.

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 10

2.5.3. Plenum Doors: Extruded aluminum frames with extruded santoprene seals. Double-wall 20 gauge galvanized steel door panel with fiberglass insulation.

2.5.4. Size: Maximum size available to fit rectangular duct panel dimension or round duct diameter. Plenum doors minimum 2-feet wide x 4-feet high.

2.6. Duct Test Holes

2.6.1. Temporary Test Holes: Cast iron or cast aluminum to suit duct material, including screw cap and gasket. Size to allow insertion of pitot tube and other testing instruments and of length to suit duct insulation thickness.

2.6.2. Permanent Test Holes: Factory fabricated, air tight flanged fittings with screw cap.

Provide extended neck fittings to clear insulation.

2.7. Dynamic Fire Dampers

2.7.1. Basis-of-Design: Ruskin Model DIBD23 (3-hour rated).

2.7.2. Ratings:

2.7.2.1. Fire Resistance: UL 555 classified and provide fire dampers with UL label for fire rating as appropriate for wall rating and in conformance with NFPA 90A.

2.7.2.2. Dynamic Closure Rating: Dampers classified for dynamic closure to 2000-feet per minute and 4-inches wg (1 kPa) static pressure.

2.7.3. Construction:

2.7.3.1. Frame: Roll formed, galvanized steel channel.

2.7.3.2. Sleeves: Damper to be supplied as a single assembly with an integral factory sleeve.

2.7.3.3. Retaining Angles: Damper to be supplied with factory retaining angles sized to provide installation overlap in accordance with manufacturer's UL listing.

2.7.3.4. Blades: Galvanized curtain type.

2.7.3.5. Closure Springs: Type 301 stainless steel, constant force or spring clip type.

2.7.3.6. Temperature Release Device: 165 degrees F.

2.7.3.7. Mounting: Vertical or Horizontal.

2.7.3.8. Finish: Mill galvanized.

2.7.4. Indicator Switches: Provide remote indication of damper blade position. One per section required.

2.7.5. Factory mounting angles and breakaway connections

2.7.6. Factory Tests: Factory cycle damper to assure proper operation.

2.8. Control Dampers

2.8.1. Basis-of-Design: Prolon PL-AV Series motorized zone/control dampers (ZD-1, ZD-2, ZD-

3).

2.8.2. Fabrication:

2.8.2.1. Frame: 16 gauge roll formed, galvanized steel hat-shaped channel, reinforced at corners. Structurally equivalent to 13 gauge U-channel.

2.8.2.2. Blades:

2.8.2.2.1. Style: Single skin with 3 longitudinal grooves.

2.8.2.2.2. Action: Opposed blade for modulating applications, parallel blade for two position application.

2.8.2.2.3. Orientation: Horizontal or vertical with thrust washers.

2.8.2.2.4. Material: Minimum 16 gauge equivalent thickness, galvanized steel.

2.8.2.2.5. Width: Nominal 6-inches.

2.8.2.3. Bearings: Molded synthetic sleeve, turning in extruded hole in frame.

2.8.2.4. Seals:

2.8.2.4.1. Blade: Inflatable PVC coated fiberglass material and galvanized steel.

Mechanically attached to blade edge.

2.8.2.4.2. Jamb: Flexible metal compression type.

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 11

2.8.2.5. Linkage: Concealed in frame.

2.8.2.6. Axles: Minimum 1/2-inch diameter plated steel, hex-shaped, mechanically attached to blade.

2.8.2.7. Mounting: Vertical or horizontal.

2.8.2.8. Finish: Mill galvanized for installation in galvanized sheetmetal and stainless steel for installation in stainless steel ductwork.

2.8.3. Performance Data (low leakage dampers):

2.8.3.1. Capacity: Demonstrate capacity of damper to withstand HVAC system operating conditions.

2.8.3.1.1. Closed Position: Maximum pressure of 5-inches wg (1.2 kPa) at a 12-inch

(305) blade length.

2.8.3.1.2. Open Position: Maximum air velocity of 2,000-feet per minute (610 m/min).

2.8.3.2. Leakage: Maximum 3.7 cubic-feet per minute per square foot (1.1 m3/min/m2) at 1-inch wg (0.25 kPa) for sizes 36-inches wide and above.

2.8.3.3. Pressure Drop: Maximum 0.07-inch wg (0.02 kPa) at 1,500-feet per minute (457 m/min) across 24-inch x 24-inch damper.

2.8.4. Factory Flange Frame

2.8.5. Factory Sleeve: Minimum 20 gauge thickness.

2.8.6. Duct Transition Connection: Round, Oval, or Rectangular.

2.8.7. Factory Tests: Factory cycle damper assembly to assure proper operation.

2.9. Turning Vanes

2.9.1. Fabricate to comply with SMACNA's "HVAC Duct Construction Standards--Metal and

Flexible" for vanes and vane runners. Vane runners to automatically align vanes.

2.9.2. Manufactured Turning Vanes: For medium pressure ductwork, ductwork upstream of terminal units, and in ductwork with equal inlet width and height dimensions and outlet width and height dimension, provide double thickness airfoil turning vanes. Low pressure ductwork and ductwork downstream of terminal units use either single thickness or double thickness turning vanes. For mitered rectangular elbows with changes in size from inlet to outlet, only use single thickness turning vanes. Use 4-inch radius vanes spaced on centers of 3.25-inches for single thickness. Use 4-inch radius vanes spaced on centers of 3.5-inches for double thickness.

2.10. Flexible Connections

2.10.1. General Description: Flame-retardant or noncombustable fabrics, coatings, and adhesives complying with UP 181, Class 1.

2.10.2. Metal-Edged Connections: Factory fabricated with fabric strip 3-1/2 inches wide attached to two strips of 2-3/4 inch wide 0.028-inch thick galvanized sheet steel or 0.032-inch thick aluminum sheets. Select metal compatible with ducts.

2.10.3. Indoor System, Flexible Connector Fabric: Glass fabric double coated with neoprene.

2.10.3.1. Minimum Weight: 26 oz./sq. yd. (880 g/sq. m).

2.10.3.2. Tensile Strength: 480 lbf/inch (84 N/mm) in the warp and 360 lbf/inch (63

N/mm) in the filling.

2.10.3.3. Service Temperature: Minus 40 to plus 200 degrees F (Minus 40 to plus 93 degrees C).

3. PART 3 – EXECUTION

3.1. Preparation

3.1.1. Verify that electric power is available and of correct characteristics.

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 12

3.1.2. Inspect areas to receive air duct accessories. Notify Engineer of conditions that would adversely affect the installation of the dampers. Do not proceed until conditions are corrected.

3.1.3. Coordinate location in RCP and color of concealed damper hardware with Architects prior to installation.

3.2. Installation

3.2.1. Install duct accessories according to applicable details in SMACNA's "HVAC Duct

Construction Standards--Metal and Flexible" for metal ducts.

3.2.2. Provide duct accessories of materials suited to duct materials; use galvanized-steel accessories in galvanized-steel, stainless-steel accessories in stainless-steel ducts, and aluminum accessories in aluminum ducts.

3.2.3. Install backdraft dampers on exhaust fans or exhaust ducts nearest to outside and where indicated.

3.2.4. Where installing volume dampers in ducts with liner; avoid damage to and erosion of duct liner.

3.2.5. Provide balancing dampers at points on supply, return, and exhaust systems where branches lead from larger ducts for air balancing. Install at a minimum of two duct widths from each branch takeoff. Provide balancing dampers for all air inlets and outlets.

3.2.6. Provide test holes at fan inlets and outlets and where required for air testing and balancing.

3.2.7. Install fire dampers, with fusible links, and in accordance with manufacturer's UL-approved written instructions.

3.2.8. Install all dampers square and free from racking with blade running horizontally.

3.2.9. Do not compress or stretch damper frames into duct or opening.

3.2.10. Handle dampers using sleeve or frame. Do not lift dampers using blades, actuators, or jack shafts.

3.2.11. Install bracing for multiple sections to support assembly weights and hold against system pressure. Install bracing as needed.

3.2.12. Turning Vanes:

3.2.12.1. Vanes must be installed in all square elbows, eliminating every other vane is not allowed.

3.2.12.2. Single thickness vanes cannot be over 36-inches long without intermediate vane runner.

3.2.12.3. Install per SMACNA and fasten/support to prevent vibration, noise, and to maintain proper alignment at design velocity.

3.2.13. Install duct access doors to allow for inspecting, adjusting, and maintaining accessories and terminal units as follows:

3.2.13.1. On both sides of duct coils.

3.2.13.2. Downstream from volume dampers and equipment.

3.2.13.3. Adjacent to fire dampers, providing access to reset or reinstall fusible links.

3.2.13.4. To interior of ducts for cleaning; before and after each change in direction, at maximum 50-foot (15-m) spacing.

3.2.13.5. Install the following sizes for duct-mounting, rectangular access doors:

3.2.13.5.1. One-Hand or Inspection Access: 8-inches by 5-inches.

3.2.13.5.2. Two-Hand Access: 12-inches by 6-inches.

3.2.13.5.3. Head and Hand Access: 18-inches by 10-inches.

3.2.13.5.4. Head and Shoulders Access: 21-inches by 14-inches.

3.2.13.5.5. Body Access: 25-inches by 14-inches.

3.2.13.5.6. Body Plus Ladder Access: 25-inches by 17-inches.

RFP-KTHFS-2026-003 – ADDENDUM #4 – Chiloquin Fitness Center Expansion Project Page 13

3.2.13.6. Install the following sizes for duct-mounting, round access doors:

3.2.13.6.1. One-Hand or Inspection Access: 8-inches in diameter.

3.2.13.6.2. Two-Hand Access: 10-inches in diameter.

3.2.13.6.3. Head and Hand Access: 12-inches in diameter.

3.2.13.6.4. Head and Shoulders Access: 18-inches in diameter.

3.2.13.6.5. Body Access: 24-inches in diameter.

3.2.13.7. Label access doors.

3.2.14. Install flexible connectors immediately adjacent to equipment in ducts associated with fans and rooftop units (RTU-1 through RTU-5, EF-1, EF-2) supported by vibration isolators. Provide sheet metal weather cover over flexible connections located outdoors.

Attach sheet metal to either equipment side or ductwork side, but not both.

3.2.15. For fans developing static pressures of 5-inch wg (1250 Pa) and higher, cover flexible connectors with loaded vinyl sheet held in place with metal straps.

3.2.16. Install duct test holes where indicated and required for testing and balancing purposes.

3.3. Adjusting

3.3.1. Adjust duct accessories for proper settings.

3.3.2. Adjust fire dampers for proper action.