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Dura-Flex Gray Flex Duct Inspection
- POST a QUESTION or COMMENT about gray flexduct deterioration in building HVAC duct systems
Dura-Flex gray flex duct field inspection report:
This article discusses Dura-Flex™ brand gray flex duct found in good condition. The article includes references to flex-duct product failures by manufacturers of similar flexible duct work products.
We include photographs illustrating heat-damaged flex-duct covering materials and we explain the implications on home energy costs when this material is installed in buildings.
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.
- Daniel Friedman, Publisher/Editor/Author - See WHO ARE WE?
Dura-Flex Gray Flexduct Field Report
The following field report on Dura-Flex gray flexible HVAC ducts is provided by home inspector and frequent InspectApedia.com contributor Eric Van De Ven. He writes:
Attached are pictures of Dura-Flex duct work, which is similar to the Owl-Flex duct work and the others. This duct work was in very good condition. The odd thing about this house, was that it was built in 1993. This is the latest build date I have seen this type of duct work. The home also had Polybutylene plumbing lines! - personal email E VdV to DJF 5 Feb 2016
The photos provided by Eric demonstrate that at least where installed in a 1993 home in a hot climate, this flex duct had not suffered the same deterioration as that found with similar brands of gray plastic coverd flexible ductwork.
The Dura-Flex ductwork shown here was not found to be damaged.
Where ductwork is suspended over a wire or narrow sheet metal strap, watch out for reduced airflow and increased HVAC operating cost due to crimping. More "do's and don'ts" for flexible HVAC duct installation are at DUCT ROUTING & SUPPORT.
In this 1993 home we see flex duct routed through trusses supporting the roof structure. below is the connection of one end of the Dura-Flex ductwork to what appears to be an end of the air handler or of a duct trunk line.
To buy replacement flex duct for your system see FLEX DUCT SOURCES & HISTORY.
- Eric Van De Ven, Coconut Creek, Fl 33066 - (954) 340 6615, a South Florida home inspector, former ASHI and NACHI member, current IHINA (Independent Home Inspectors of North America). ev@magnuminspections.com
Flex Duct Failure Articles
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Continue reading at GRAY FLEXDUCT FAILURES or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.
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DURA-FLEX FLEXDUCT at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
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Citations & References
In addition to any citations in the article above, a full list is available on request.
- Thanks to Jon Bolton, an ASHI, FABI, and otherwise certified Florida home inspector who provided photos of failing Goodman gray flex duct in a hot attic
- Eric Van De Ven, Coconut Creek, Fl 33066 - (954) 340 6615, a South Florida home inspector, former ASHI and NACHI member, current IHINA (Independent Home Inspectors of North America). ev@magnuminspections.com
- Flexduct lawsuit, Richard T.D. Bethea et als, v. Song Hee Hong, et al, filed may 29, 2009, Jackson Tennessee Court of Appeals, dispute involving the contract for sale of a house. A musty odor was associated with mold contaminated flex duct in the building. The ductwork could not be cleaned because of its fragility - an Owl-flex duct product. Sellers (correctly) asserted that the ductwork could not be cleaned. The court finding includes the statement that "OWL FLEX ductwork was uncleanable". The buyers ability to terminate the sales contract was upheld.
- "Design & Installation of Residential Flexible Ductwork Systems", Georgia Department of Community Affairs, 60 Executive Park, NE, Atlanta GA 30329
- (404) 679-4940 - (800) 359-4663 [Also see the installation manuals below at JPL] - original source dca.state.ga.us/development/construction codes/publications/1ONE.pdf
"1. This information is intended to assist contractors, installers and code officials in the proper design and installation of flexible ductwork systems. The information presented in this document comes primarily from sources in the International Mechanical Code including referenced standards and Georgia Amendments.
2. It is recommended as a guide that HVAC system documentation, including owner’s manuals, manufacturer’s installation instructions and a sketch of the duct system design that details duct size and approximate duct lengths be provided to the building owner or posted on the air handling unit or furnace. (See sample Duct System Design Sketch). Documentation should also include Manual J calculations." - "Flexible Duct Performance & Installation Standards", Air Diffusion Council, 1901 N. Roselle Road, Suite 800, Schaumburg, Illinois 60195, Tel: (847) 706-6750, Fax: (847) 706-6751 - Email: info@flexibleduct.org - www.flexibleduct.org/ -
"The ADC has produced the 4th Edition of the Flexible Duct Performance & Installation Standards (a 28-page manual) for use and reference by designers, architects, engineers, contractors, installers and users for evaluating, selecting, specifying and properly installing flexible duct in heating and air conditioning systems.
Features covered in depth include: descriptions of typical styles, characteristics and requirements, testing, listing, reporting, certifying, packaging and product marking.
Guidelines for proper installation are treated and illustrated in depth, featuring connections, splices and proper support methods for flexible duct. A single and uniform method of making end connections and splices is graphically presented for both non-metallic and metallic with plain ends."
The printed manual is available in English only. Downloadable PDF is available in English and Spanish. - Flexduct lawsuit, Richard T.D. Bethea et als, v. Song Hee Hong, et al, filed may 29, 2009, Jackson Tennessee Court of Appeals, dispute involving the contract for sale of a house. A musty odor was associated with mold contaminated flex duct in the building. The ductwork could not be cleaned because of its fragility - an Owl-flex duct product. Sellers (correctly) asserted that the ductwork could not be cleaned. The court finding includes the statement that "OWL FLEX ductwork was uncleanable". The buyers ability to terminate the sales contract was upheld.
- Owens Corning Duct Solutions - www.owenscorning.com/ductsolutions/ - provides current HVAC ductwork and duct insulating product descriptions and a dealer locator. Owens Corning Insulating Systems, LLC, One Owens Corning Parkway, Toledo, OH 43659 1-800-GET-PINK™
- "Flexible Duct Media Fiberglas™ Insulation, Product Data Sheet", Owens Corning - see owenscorning.com/quietzone/pdfs/QZFlexible_DataSheet.pdf
"Owens Corning Flexible Duct Media Insulation is a lightweight, flexible, resilient thermal and acoustical insulation made of inorganic glass fibers bonded with a thermosetting resin." - "Flexible Duct Performance and Installation Standards", (3rd ed.) – Air Diffusion Council, 1901 N. Roselle Road, Suite 800, Schaumburg, Illinois 60195, Tel: (847) 706-6750 - Fax: (847) 706-6751 email: Email: info@flexibleduct.org
- HVAC Duct Construction Standards—Metal and Flexible (1995 ed.) – Sheet Metal and Air Conditioning Contractors’ National Association, Inc. (SMACNA)
- J.P. Lamborn Co., 559-650-2120 / fax 559-650-2112, email: cuserv@jplflex.com - original source for the air duct installation manuals below - http://www.jplflex.com/featured/instructions.asp - note that these FlexDuct installation guides provided by JP Lamborn Co. originate with the Air Diffusion Council - referenced above.
Flexible air duct Installation Instructions for Air Ducts & Connectors without fittings
Flexduct Installation Instructions for Flexible Air Ducts & Connectors with fittings
Flex duct Installation Instructions for Flex Ducts & Connections using mastic
"Originally founded in 1961, JP Lamborn Co. has grown to become one of the largest producers of insulated flexible duct in the country. With 4 state of the art manufacturing plants strategically positioned across the USA in order to serve a growing national distributor base. The company prides itself in delivering quality, service, innovations and competitive pricing to customers it serves." - International Mechanical Code, 2000 Edition, with 2001, 2004 & 2005 Georgia Amendments
- Manual D—Residential Duct Systems – Air Conditioning Contractors of America (ACCA)
- In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested
CONTINUE READING or RECOMMENDED ARTICLES.
- Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: info@carsondunlop.com. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The HOME REFERENCE BOOK - the Encyclopedia of Homes and to use illustrations from The ILLUSTRATED HOME .
Carson Dunlop Associates provides extensive home inspection education and report writing material. In gratitude we provide links to tsome Carson Dunlop Associates products and services.
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