23-31-14 Ductwork Accessories - Part 1 - General

Nov 4, 2026

Section 23 31 14 specifies ductwork accessories required for an HVAC ductwork system, including flexible connections, direction and volume control dampers, fire and fire/smoke/smoke dampers, radiation-related dampers, turning vanes, duct access doors and inspection plates, test openings, screens, and miscellaneous ductwork materials. The section defines governing contract and general requirements, establishes quality assurance through SMACNA and ASHRAE standards, requires UL-listed and FM-approved fire damper certifications, and lists acceptable manufacturers. It also details required submittals such as shop drawings and UL-approved installation instructions, plus delivery, storage, and careful handling practices.

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SECTION 23 31 14-DUCTWORK ACCESSORIES

PART 1 - GENERAL

PART 2 - PRODUCTS

SECTION 23 31 14-DUCTWORK ACCESSORIES PART 1-GENERAL 1.1 RELATED DOCUMENTS: A. The Conditions of the Contract and applicable requirements of Division 1, "General Requirements", and Section 23 01 00 , "Mechanical General Provisions", govern this Section. 1.2 DESCRIPTION OF WORK: A. Work Included: Provide ductwork accessories as shown on the Drawings, specified and required. B. Types: The types of ductwork accessories required for the project include, but are not limited to: 1. Flexible connections. 2. Direction and volume control dampers. 3. Fire dampers. 4. Fire/smoke dampers. 5. Smoke Dampers. 6. Radiation dampers. 7. Flashing and counterflashing. 8. Turning vanes. 9. Duct access doors and inspection plates. 10. Test openings. 11. Screens. 12. Miscellaneous ductwork materials. 1.3 QUALITY ASSURANCE: A. SMACNA Compliance: Comply with applicable portions of Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) "HVAC Duct Construction Standards", current edition. B. ASHRAE Standards: Comply with American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. (ASHRAE) recommendations pertaining to construction of ductwork accessories, except as otherwise indicated. C. Certification: Fire, fire/smoke and smoke dampers shall be UL-listed, FM-approved and comply with applicable building code requirements. D. Manufacturers: Provide products complying with the specifications and produced by one of the following: 1. American Foundry. 2. Air Balance Inc. 3. Duro-Dyne. 4. Elgin Sheet Metal Products. 5. Nailor Industries. 6. Prefco. 7. Ruskin. 8. Tuttle and Bailey. 9. United Sheet Metal. 10. Vent-Fabrics, Inc. 11. Ventlok. 12. Young Regulator Co. 1.4 SUBMITTALS: A. Shop drawings submittals shall include, but not be limited to, the following: 1. Cut sheets of ductwork accessories, clearly indicating materials, construction dimensions, ratings, approvals, and other pertinent information. 2. Manufacturers' UL-approved installation instructions for fire, fire/smoke, and smoke dampers. 3. Additional information as required in Section 23 01 00. 1.5 PRODUCT DELIVERY, STORAGE AND HANDLING: A. Deliver ductwork accessories in factory-fabricated water-resistant wrapping. B. Handle ductwork accessories carefully to avoid damage to material component, enclosure and finish. C. Store ductwork accessories in a clean, dry space and protect from the weather. PART 2-PRODUCTS 2.1 DUCTWORK ACCESSORIES, MATERIALS, AND FABRICATION: A. General: Provide ductwork accessories which comply with Sections 15840, "Ductwork", and 15845,"Ductwork Accessories", for applicable product requirements of ductwork materials and as required fora complete ductwork system installation. 2.2 FLEXIBLE CONNECTIONS: A. General: Flexible connections shall be minimum 3" wide and be UL-labeled, 30 ounces glass fabriclined with insulation and coated on both sides with neoprene, complete with attachment accessories,"Vent-Glass" by Vent-Fabrics, Inc. , Elgen "Zipper-lock" HZ-LN-14, Duro-Dyne Excelon "Metal-Fab", flexible connections shall be fabricated in accordance with Fig. No. 2-19 of the SMACNA HVAC Duct Construction Standards, current edition, or approved equal. 2.3 DIRECTION AND VOLUME CONTROL DAMPERS: A. General: Provide all direction and balancing (volume control) shown or noted on Drawings. All damper control devices shall be installed so as to be fully concealed in finished rooms and spaces. B. Control Dampers: 1. Splitter Dampers: Splitter dampers shall be fabricated of steel not lighter than 16 gauge. The leading edge of the damper shall be hemmed. Each splitter shall be a minimum of 12" long or 1-1/2 times the width of the smaller of the two branches it controls, whichever is greater. Dampers shall be carefully fitted, and shall be controlled by locking quadrants equal to Ventlok No. 555 on exposed uninsulated ductwork, Ventlok

FAQs

What ductwork accessory types are included in this section?

The section covers flexible connections, direction and volume control dampers, fire dampers, fire/smoke dampers, smoke dampers, radiation dampers, flashing and counterflashing, turning vanes, duct access doors and inspection plates, test openings, screens, and miscellaneous ductwork materials.

Which standards govern quality assurance for ductwork accessories?

Quality is governed by SMACNA HVAC Duct Construction Standards and ASHRAE recommendations for constructing ductwork accessories. Fire and related dampers must be UL-listed, FM-approved, and comply with applicable building code requirements.

What submittals are required before installation?

Submittals include shop drawings showing materials, dimensions, ratings, approvals, and other relevant details. It also requires manufacturers’ UL-approved installation instructions for fire, fire/smoke, and smoke dampers, plus additional information required by Section 23 01 00.

Nov 4, 2026

Uploaded by Riley West