SECTION 23 37 00
FABRIC DUCTS AND DIFFUSERS
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Copyright 2016 - 2016 ARCAT, Inc. - All rights reserved
** NOTE TO SPECIFIER ** Prihoda North America; Air ducting and diffusers commonly referred to as Fabric Duct Socks, or Textile Air Dispersion System.
This section is based on the products of Prihoda North America, which is located at:
6925 Cottage Hill
Mobile, AL 36695
Toll Free Tel: 855-PRIHODA (774-4632)
Tel: 855-774-4632
Fax: 855-774-4632
Email:request info ( )
Web:
[Click Here] for additional information.
Prihoda offers the highest quality to price ratio by combining cutting edge manufacturing technology, modern logistics and exceptional teamwork between our departments and customers. We take great pride in even the smallest details which separate our air duct and diffuser solutions from all the rest while still providing the most competitive pricing in the industry. Fabric ducting is not only our specialty of more than 20 years, it is our true passion. Product engineers are constantly focused on the improvement of product design, function and documented performance data.
With literally thousands of successful applications around the world, we know what works. and what doesn't. Using our proprietary software, experienced sales engineers review the details of every order prior to release to production to ensure all installations provide optimum performance and longevity. Our state of the art manufacturing techniques and workflow set the production lead time standards for the industry.
In 2014 over 5000 custom orders were produced with manufacture lead times never exceeding 3 weeks and many even produced on expedite within one week. Short lead times and fast installation ensures Prihoda products fit even the tightest project timelines, enabling on time or ahead of schedule completion.
1 GENERAL
1.1 SECTION INCLUDES
** NOTE TO SPECIFIER ** Delete items below not required for project.
1.1.1 Fabric air dispersion systems including:
1.1.1.1 Fabric ducts and diffusers.
1.1.1.2 Hanger supports, suspension, and mounting hardware.
1.1.1.3 Accessories.
1.2 RELATED SECTIONS
** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
1.2.1 Section 23 74 33 - Dedicated Outdoor-Air Units.
1.2.2 Section 23 30 00 - HVAC Air Distribution.
1.3 REFERENCES
** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
1.3.1 International Organization for Standardization (IS0):
1.3.1.1 ISO 9001 - Quality Management Systems.
1.3.1.2 ISO 13934-1 - Textiles, Tensile Properties of Fabrics.
1.3.1.3 ISO 14644-1 - Cleanrooms and Associated Controlled Environments.
1.3.1.4 ISO 14001 - Environmentally Friendly Production Methods.
1.3.1.5 ISO 20645 - Textile Fabrics, Determination of Antibacterial Activity.
1.3.2 Underwriters Laboratories (UL):
1.3.2.1 UL723 - Standard Test for Surface Burning Characteristics of Building Materials.
1.3.2.2 UL 2518 - Outline Investigation for Air Dispersion System Materials.
1.4 SUBMITTALS
1.4.1 Submit under provisions of Section 01 30 00 - Administrative Requirements.
1.4.2 Product Data: Manufacturer's data sheets on each product to be used, including:
1.4.2.1 Manufacturer's performance data for each fabric duct and diffuser system, including airflow rate, inlet velocity, static pressure and exit velocity out of duct system represented and verified by graphical air distribution profile or CFD analysis.
1.4.2.2 Preparation instructions and recommendations.
1.4.2.3 Storage and handling requirements and recommendations.
1.4.2.4 Installation methods.
1.4.3 Test Results and Product Documentation:
1.4.3.1 ISO 9001 certificate from production facility.
1.4.3.2 ISO 14001 certificate from production facility.
1.4.3.3 UL file number under which product is Classified by Underwriter's Laboratories to UL723 (NFPA 90), ICC AC167 and UL 2518.
1.4.3.4 Antimicrobial/antibacterial standard ISO 20645.
1.4.3.5 Non-shedding material standard ISO 14644-1.
1.4.3.6 Fabric strength ISO 13934-1.
1.4.3.7 Anti Static properties.
1.4.4 Shop Drawings: Submit manufacturer's drawings indicating size and placement of distribution method, mounting and installation instructions
1.4.5 Verification Samples: Provide two full size units for each product to be installed, minimum length 36 inch (1 meter) for projects exceeding 100,000USD sales price or for unique or prototype products.
1.4.6 Closeout Submittals:
1.4.6.1 Maintenance data.
1.4.6.2 Warranty.
1.4.6.3 Sustainable air duct information such as LEED v4 contribution category eligibility, Environmental Product Declaration (EPD), Life Cycle Analysis (LCA), Health Product Declaration and/or Living Building Challenge Red List Compliance.
1.4.6.4 Performance data including pressure losses and graphical air distribution profile or Computational Fluid Dynamics (CFD).
1.5 QUALITY ASSURANCE
1.5.1 Manufacturer Qualifications: ISO 9001 registered.
1.5.2 Installer Qualifications:
1.5.2.1 Manufacturer certified installer with minimum 2 years experience installing similar products.
1.5.2.2 Close collaboration and approval of installation from the manufacturer may be permitted on a case-by-case basis. Contact the manufacturer for more information.
1.5.3 Products:
1.5.3.1 Labeled with the logo and classification marking of Underwriter's Laboratories (UL), order number and manufacture date.
1.5.3.2 Antibacterial/antimicrobial agent applied from factory meeting test standard ISO 20645.
1.5.3.3 Products must be classified in accordance with the 25/50 flame spread/smoke development requirements of UL723 based on NFPA 90A - 1993, "Installation of Air Conditioning and Ventilating Systems", and in accordance with ICC Evaluation Service AC167 and UL 2518.
1.5.3.4 Fabrics shall meet minimum criteria for use in ISO Class 4 application (Clean room, non shedding material) as defined by ISO 14644-1.
1.5.3.5 Textile Material shall meet minimum tensile strength warp1880/ weft1090N as defined by ISO 136934-1.
1.5.3.6 Textile Material must have documented ability to dissipate static electricity (anti-static properties) for use in volatile / explosion protected production facilities, sensitive electronic equipment, server rooms, and data storage.
1.5.3.7 Fabric Duct air dispersion system must be designed in software which documents, calculates and provides: pressure loss, inlet velocity, turbulent condition warnings, throw capability, entrainment, deflection, flow models, sizing, installation methods, sound generated graphical air flow profile or CFD analysis and temperature corrections.
1.5.3.8 Submit third party certification of recycled content.
1.6 PRE-INSTALLATION MEETINGS
1.6.1 Convene at the project site minimum two weeks prior to starting work of this section.
1.6.1.1 Prior to or during the pre-installation meeting, contact the manufacturer via phone, email, or web conference to answer project specific questions and concerns.
1.7 DELIVERY, STORAGE, AND HANDLING
1.7.1 Protect duct systems from damage during shipping, storage, and handling in accordance with manufacturer's recommendation.
1.7.2 Deliver and store products in manufacturer's unopened packaging bearing the brand name and manufacturer's identification until ready for installation.
1.7.3 Store products inside and protect from weather.
1.8 PROJECT CONDITIONS
1.8.1 Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's recommended limits.
1.8.1.1 Do not use fabric duct air diffusers in concealed locations unless pressurized plenum space intended for air distribution.
1.8.1.2 Fabric diffusers shall be designed from minimum 0.25 inch (6.35 mm) water gage to 3 inch (76.2 mm) as the maximum 0.5 inch (12 mm) standard.
1.8.1.3 Design temperatures between -75 deg to +230 deg F (-59 deg to 110 deg C).
1.8.1.4 Manufacturer shall approve all technical design parameters.
1.8.2 Air Handler Requirements:
1.8.2.1 Provide adequate pre-filtering (MINIMUM EU3/MERV 5) prior to the fabric duct system, all according to manufacturer's specifications.
1.8.2.2 Provide fans supplying constant static pressure. If Variable Air Volume (VAV), minimum and maximum airflow volume and static pressure must be disclosed for design purposes.
1.8.2.3 If hold open option is not specified, the manufacturer recommends using a soft starter, Variable Speed Drive (VSD), Variable Frequency Drive (VFD), motorized damper, stage multiple supply fans, or providing a way of introducing the total air volume slowly to the duct. VFD, VSD's and motorized dampers should be programed for a 30 second ramp up time.
1.9 SEQUENCING
1.9.1 Ensure that products of this section are supplied to affected trades in time to prevent interruption of construction progress.
1.10 WARRANTY
1.10.1 Provide manufacturers standard non-prorated warranty including:
1.10.1.1 Fabric Duct System: 10 year warranty.
1.10.1.2 Full Length Perimeter Fabric Tensioning System: 20 year warranty.
2 PRODUCTS
2.1 MANUFACTURERS
2.1.1 Acceptable Manufacturer: Prihoda North America, which is located at: 6925 Cottage Hill; Mobile, AL 36695; Toll Free Tel: 855-PRIHODA (774-4632) ; Tel: 855-774-4632; Fax: 855-774-4632; Email:request info ( ); Web:
** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
2.1.2 Substitutions: Not permitted.
2.1.3 Requests for substitutions will be considered in accordance with provisions of Section 01 60 00 - Product Requirements.
2.2 FABRIC DUCTS
** NOTE TO SPECIFIER ** Polyester PMI fabric is typical, additional types including polyurethane, PVC, fiberglass, nylon (PMS/NMS, MNI, NLS, NLF, NMF, NHE, NMR, NLW, and NMT) with varying weights and physical properties, discuss with manufacturer to revise below as required.
2.2.1 Fabric Ducting and Diffusers: Provide Prihoda products to serve as general ducting and air distribution devices or return devices at the same time. Prihoda Fabric Air Dispersion System shall be constructed of PMI fabric, a woven fire retardant and permeable fabric complying with the following characteristics:
2.2.1.1 Fabric: 100% Flame Retardant Polyester treated with an antimicrobial agent applied from factory meeting test standard ISO 20645.
** NOTE TO SPECIFIER ** Select one of the following recycled content. Delete not required.
2.2.1.1.1 Material must include recycled content.
2.2.1.1.2 Material must be comprised of 100% Post-consumer recycled content polyester with Environmental Product Declaration based on a Life Cycle Analysis verified by a third party such as SCS Global Services.
** NOTE TO SPECIFIER ** Select positive or negative pressure applications. Delete not required.
2.2.1.2 Application:
2.2.1.2.1 Positive pressure fabric ducting and diffusers.
2.2.1.2.2 Negative pressure ducting for exhaust or returning air to units from spaces being served.
2.2.1.2.2.1 Both positive and negative pressure applications as shown on the Drawings.
** NOTE TO SPECIFIER ** Select shapes to be installed. Delete not required.
2.2.1.3 Shape:
** NOTE TO SPECIFIER ** The following are only available in positive pressure. Delete not required.
2.2.1.3.1.1 Circular.
2.2.1.3.1.2 Half-Round.
2.2.1.3.1.3 Quarter-Round.
2.2.1.3.1.4 Segment.
2.2.1.3.1.5 Sector.
** NOTE TO SPECIFIER ** The following are available in positive or negative pressure. Delete not required.
2.2.1.3.2 Square.
2.2.1.3.3 Triangular.
2.2.1.4 Weight: Minimum 6.5 ounces per square yard (220 grams per square meter) per ASTM D3776.
2.2.1.5 Strength: Warp 1880 / Weft 1090N per ISO13934.
2.2.1.6 Shrinkage: Maximum 0.5 percent per ISO 6330-2000.
2.2.1.7 Temperature Range: -75 deg to +230 deg F (-59 deg to 110 deg C).
** NOTE TO SPECIFIER ** Select 2 cfm for 100% recycled content, delete options not required.
2.2.1.8 Permeability: 2 cfm or less (to prevent condensation only).
2.2.1.9 Permeability: Non-permeable.
2.2.1.10 Fire Retardant: Must meet the requirements in NFPA 90-A, ICC AC-167 and UL2518.
** NOTE TO SPECIFIER ** Select color, delete options not required.
2.2.1.11 Colors:
2.2.1.11.1 White (RAL 9016).
2.2.1.11.2 Light Grey (Pantone 420/RAL 7035).
2.2.1.11.3 Dark Grey (Pantone 424/RAL 7037).
2.2.1.11.4 Blue (Pantone 7462/RAL 5005).
** NOTE TO SPECIFIER ** The following colors are not available in 100% recycled content except as custom colors.
2.2.1.11.5 Yellow (Pantone 135/RAL 1017).
2.2.1.11.6 Light Blue (pantone 2915/RAL 5012).
2.2.1.11.7 Green (pantone 340/ RAL7037).
2.2.1.11.8 Black (Pantone 419/RAL9017).
2.2.1.11.9 Red (Pantone187/RAL 3001).
2.2.1.11.10 Custom color to match ______PANTONE or RAL _____ number.
2.2.1.11.11 Custom Printing: Provide logo requirements or exact text, font, size, location and quantity.
2.3 DUCT FABRlCATlON
** NOTE TO SPECIFIER ** Select method or combination of methods to suit application. Delete fabrication methods that are not required Mesh slots are not an acceptable or equivalent method of air distribution for any flow model due to overall poor performance and additional maintenance required from clogging with dirt, dust, and debris. Refer to manufacturers airflow models for various nozzle sizes and perforation behaviors.
2.3.1 Air Dispersion Method:
2.3.1.1 Micro-Perforation (low velocity, laminar, low/no throw): Woven, high porosity fabrics not accepted due to additional maintenance (washing) required. EU3/Merv 5 or better filtration required.
2.3.1.1.1.1 Uniform microperforation (cooling, isothermal/makeup air only).
2.3.1.1.1.2 Directional (short throw heating, cooling, ventilating).
** NOTE TO SPECIFIER ** Punching method is not acceptable in lieu of laser cut.
2.3.1.2 Laser Cut Perforations/holes (comfort, medium, and long throw):
** NOTE TO SPECIFIER ** Diameter from 0.15 inch (4 mm) to 3 inch (76 mm) available.
2.3.1.2.1.1 Diameter: ______.
2.3.1.2.1.2 Location, number and size determined by engineer's design requirements.
2.3.1.3 Small conical/Venturi shaped nozzles (Medium to long throw):
2.3.1.3.1.1 0.80 inch (20mm) diameter.
2.3.1.3.1.2 1.1 inch (30mm) diameter.
2.3.1.3.1.3 1.6 inch (40mm) diameter.
2.3.1.3.1.4 Location, number and size determined by engineer's design requirements.
2.3.1.4 Conical Textile Nozzles (long to very long throw, high velocity):
2.3.1.4.1.1 3 inch (76 mm) minimum diameter, spacing as determined by design.
2.3.1.4.2 Smaller or plastic nozzles not accepted as equal due to fire/smoke, throw and sound requirements.
** NOTE TO SPECIFIER ** Adjustable and Directional nozzles are available, must specify on plans or schedule.
2.3.1.4.3 Each nozzle must include internal adjustable damper.
2.3.1.4.4 Location, number and size determined by engineer's design requirements.
2.3.2 Provide system in sections optimized for maintenance, typically 16 foot (5 meter) maximum for diameters over 32 inch (812 mm), connected by zippers. Zippers must provide closure completely around the circumference to prevent air leakage.
2.3.3 Each section shall have a unique tag including information about: manufacturers order number, position, diameter of section, length of section, maintenance instruction, code compliance and contact details for spare parts.
2.3.4 Endcaps shall be zippered or sewn to the last duct section as recommended by the manufacturer.
2.3.5 Equalizers (flow correctors) or dampers shall be included as shown on plans or schedules.
** NOTE TO SPECIFIER ** Select standard cable installation, track/profile installation, or both if required. Delete installation type not required.
2.3.6 Standard cable installations shall include hooks every 20 inches (500 mm) which clip to horizontal cable and can be utilized with track/profile suspension.
2.3.7 Track/profile installations shall have continuous fabric strip which slides into track giving continuous support.
2.3.8 Include SS inlet clamp for securing to metal outlet connection point.
2.4 HANGER SUPPORTS
** NOTE TO SPECIFIER ** Select one type below, delete options not used.
2.4.1 Single Cable/Wire Suspension: One row cable system located 1.25 inch (31.75 mm) above 12 o'clock of textile duct system. Fabric Duct system to be attached to hardware using one single row of plastic hooks located 12 o'clock spaced 20 inches (500 mm). Hardware to include cable, cable clamps, turnbuckles, and tie down straps as required. Support hangers spaced at 16 feet (5 meters).
** NOTE TO SPECIFIER ** Double cable/wire suspension recommended for diameters over 32 inch (812 mm). Delete if not required.
2.4.2 Double Cable/Wire Suspension: Two row cable system with hooks located at 3 and 9 o'clock on Fabric duct system. Fabric diffuser system to be attached to wire / cable using double row of plastic hooks located 3 and 9 o'clock spaced 20 inches (500mm). Hardware to include cable, cable clamps, turnbuckles, and tie down straps as required. Support hangers spaced at 16 feet (5 meters).
** NOTE TO SPECIFIER ** Triple cable/wire suspension recommended for diameters over 54 inch (1371 mm). Delete if not required.
2.4.3 Triple Cable/Wire Suspension: Fabric Duct system to be attached to cable/wire using three rows of plastic hooks located 3, 12 and 9 o'clock spaced 20 inches (500 mm). Hardware to include cable, cable clamps, turnbuckles, and tie down straps as required. Support hangers spaced at 16 feet (5 meters).
2.4.4 Single Aluminum Track Profile: Fabric Duct system to be attached to track profile using continuous reinforced fabric strip or alternatively plastic gliders located at 12 o'clock spaced 20 inches (500 mm) can be utilized if Engineer and Architect approves of the appearance and potential increased sound criteria.
** NOTE TO SPECIFIER ** Select one of the following. 13 feet (4 meters) is ONLY possible with reinforced track specified.
2.4.4.1 Wire/cable hangers spaced at 6.6 feet (2 meters).
2.4.4.2 Wire/cable hangers spaced at 13 feet (4 meters) with reinforced track.
** NOTE TO SPECIFIER ** Double aluminum track profile recommended for diameters over 32 inch (812 mm). Delete if not required.
2.4.5 Double Aluminum Track Profile: Fabric Duct system to be attached to track profile using continuous reinforced fabric strips or alternatively plastic gliders located at 3 and 9 o'clock spaced 20 inches (500 mm) can be utilized if Engineer and Architect approves of the appearance and potential increased sound criteria.
** NOTE TO SPECIFIER ** Select one of the following. 13 feet (4 meters) is ONLY possible with reinforced track specified.
2.4.5.1 Wire/cable hangers spaced at 6.6 feet (2 meters).
2.4.5.2 Wire/cable hangers spaced at 13 feet (4 meters) with reinforced track.
2.4.6 Triple Aluminum Track Profile: Fabric Duct system to be attached to track profile using continuous reinforced fabric strip or alternatively plastic gliders located at 3,12, and 9 o'clock spaced 20 inches (500 mm) can be utilized if Engineer and Architect approves of the appearance and potential increased sound criteria.
** NOTE TO SPECIFIER ** Select one of the following. 13 feet (4 meters) is ONLY possible with reinforced track specified.
2.4.6.1 Wire/cable hangers spaced at 6.6 feet (2 meters).
2.4.6.2 Wire/cable hangers spaced at 13 feet (4 meters) with reinforced track.
2.5 ACCESSORlES
** NOTE TO SPECIFIER ** Select accessories required, delete not required, consult Prihoda for design guidance and applicability.
2.5.1 Duct Insulation: Unwoven 2 inch (52 mm) polyester layer sewn between inner wall (light weight material) and external wall of the duct (typically medium weight). Sewing decreases insulation thickness by approximately 50 percent
2.5.2 Defrost Damper for Walk-In Coolers and Freezers.
2.5.3 Anti-Static Design including:
2.5.3.1 Conductive carbon fibers woven into the material.
2.5.3.2 Conductive strip sewn on the length of the diffuse.
2.5.3.3 Zippers with metal joints.
2.5.3.4 Grounding points at the ends of the diffusers.
2.5.4 Hanging Hardware:
** NOTE TO SPECIFIER ** Select one type, delete option not used.
2.5.4.1 Plastic coated stainless steel sable, all other components Stainless Steel.
** NOTE TO SPECIFIER ** Gripples are only available on un-coated wire, and are not recommended for extremely humid environments, specifically pool rooms, as this is a bare metal wire hanger.