Perry 20S Low Smoke™ Class 1 Flame and Smoke duct is used in a wide variety of industries. Typical applications include the following:
- Chip Manufacturing
- Wastewater Treatment Plants
- Laboratory Exhaust
- Clean Rooms
- Plating and Metal Finishing
- Pharmaceutical Plants
- Automotive Plants
- Natatorium/Pool Supply & Exhaust
- Chemical Storage Facilities
- Diesel/Automotive Exhaust
- Pulp and Paper
- Mining
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Engineering assistance is available to write a specification for your individual project
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PRODUCT OFFERINGS
Perry Fiberglass offers two main categories of FRP duct products:
single wall and pre-insulated double wall.
Single Wall
Perry 20S Low Smoke™, our Class 1 rated single wall duct, meets 25/50 flame/smoke requirements of UL 181. Perry 20S Low Smoke™ is unique in the industry and has found wide acceptance for both industrial and commercial projects. It is especially desirable in corrosive environments where flame and smoke development is a concern.
Pre-Insulated Double Wall
If thermal control is a concern, then Perry 20S-IR7 pre-insulated double wall duct solves the problem. When supplied with the standard 1" insulation thickness, our double wall duct has a k factor of 0.14 and an R value of 7. The same corrosion resistant qualities can be maintained on both the ID and OD. Also available in R-5, R-10, R-14 or as specified.
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CONFIGURATION OPTIONS
Below are the basic configurations of our industrial duct.
Shape (see Figure 1)
Typical shapes for filament wound construction are round, rectangular and oval. Special shapes such as triangular are also available. Engineering assistance is available for designing projects requiring non-standard construction.
Figure 1
Typical Duct Shapes from Perry Fiberglass
(Custom shapes available upon request.)
Diameter
Duct diameters are available from 2" - 144". Rectangular sizes are available as required for your projects. The same range of sizes are available in Perry 20S-IR7 pre-insulated double wall duct.
Wall Thickness
Duct wall thickness ranges from 1/8" to 1" (increasing in increments
of 1/16"). Other wall thicknesses are available for abnormal burial depths or other special loading requirements. Standard ductwork is furnished with the following minimum wall thickness as set forth in PS 15-69 and SMACNA:
| Diameter |
Wall Thickness |
| 2" to 20" |
.125 inches |
| 21" to 36" |
.187 inches |
| 37" to 60" |
.250 inches |
Lengths
Standard length is 10'-0". Lengths up to 50 feet are available.
Fittings (see Figure 2)
Standard fittings include:
- Elbows
- Tees
- Laterals
- Y's
- Reducers
- Dampers
- Register Boxes
- Square to Rounds
- Crosses
- Flanges
- Blastgates
- Access Door
- Stacks
- Caps
- Hoods
Figure 2
Typical Duct Fittings from Perry Fiberglass
(Custom fittings available upon request.)
Colors
A wide range of colors is available for overhead exposed applications. Please refer to the supplemental color chart in Download Area for complete details.
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SPECIFICATIONS
Perry Fiberglass FRP duct is manufactured from premium grade resins, filament wound over steel mandrels. This product meets the standards of UL 181, NFPA 90A and Uniform Mechanical Code (UMC) 10-1 for non-metallic ducts. Perry 20S Low Smoke™ duct is classified as a Class 1 air duct having a flame spread not over 25, and a smoke development rating not over 50. ASTM E84 (recognized by all as the most definitive of all fire test methods) tests were made by HPVA Laboratory and Testing Service, Reston, VA. HPVA is a recognized laboratory for the E84 fire rating test by the building code organizations under the Council of American Building Officials: Report No. Ner-TL329; ICBO; BOCA and SBCCI. Perry Fiberglass duct is fabricated to meet the requirements of National Bureau of Standards Voluntary Product Standard PS 15-69, SMACNA, ASTM D-2310 and ASTM D-2996 for establishing wall thickness, pressure capacity, and quality of fabrication.
This summary is provided as an overview of the strict standards that Perry Fiberglass meets with the production of all our products. Complete technical specifications are available upon request for all Perry Fiberglass products.
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INSTALLATION & JOINING
Perry Fiberglass FRP duct is easy to configure and install. Our ducts can be installed overhead or directly buried into a pea gravel backfilled trench without concrete encasement.
Duct supports/hangers should be per recognized standards such as SMACNA or ASTM D-3952. In general, spacing is 8-12 feet dependent upon diameter and loading factors. Supports should be a minimum 120 degrees of diameter. Particular attention should be given to properly design supports and hangers to avoid point loading.
Field Wet Lay-Up Joint Instructions (see Figures 3, 4, & 5)
This requires joining duct and/or fittings with resin and fiberglass mat. See separate Welding Procedures for complete details.
Wet field joints shall be a minimum four (4) inches in width and at least the same thickness as adjoining duct wall. Butted sections may be "tabbed/hot patched" to hold alignment until a complete joint can be made.
NOTE:
LEAK TEST THE SYSTEM BEFORE PLACING INTO SERVICE.
Bell and Spigot Connection (see Figures 3, 4, & 5)
This requires joining duct and/or fittings with resin and fiberglass mat and additionally filling the bell gap with putty. See separate Welding Procedures for complete details.
Figure 3
Preparation of Strapping
(Complete instructions available in the Download Area of our website.)
*Refer to manufacturer's welding procedures.
Figure 4
Application of Strapping
(Complete instructions available in the Download Area of our website.)
*Refer to manufacturer's welding procedures.
Figure 5
Butt-and-Strap End-to-End Joint
(Complete instructions available in the Download Area of our website.)
*Refer to manufacturer's welding procedures.
Flanged Connection
Flanges are furnished undrilled for field drilling to match equipment. Flanges are furnished factory mounted or as loose stub flanges. Flange connections should be gasketed per architect's/engineer's specification.
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