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LEED 2009 EDITION AND DUCT SYSTEMS
Demystifying Prerequisites and Credits
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LEED OVERVIEW

• CERTIFIED, SILVER, GOLD or PLATINUM
• Based on the accumulation of credits.
• A LEED Certified project must meet the
  prerequisites and the design team shall specify
  the credits applicable to the project
• The design team will implement procedures and
  specify methods or products to meet individual
  LEED credit requirements
• LEED status does not require the use of
  specific credits any and all of them count.

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LEED Prerequisites Impacting Duct Systems
ENERGY AND ATMOSPHERE
INDOOR ENVIRONMENTAL QUALITY
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ENERGY AND ATMOSPHERE

• PREREQUISITE 2 Duct must comply with ASHRAE
  90.1-2007 SECTION 6.4.4.1.2 Duct and Plenum
  Insulation
• All ducts must comply with Tables 6.8.2.A and
  6.8.2.B
• Duct can be wrapped or internally lined
• Internal liner is often used for acoustical
  attenuation only
• Engineer must specify correct insulation
• Certain climate zones require R6 and R8
  insulation. Most standard insulation is 1 1.5
  PCF which is nominal R4. To meet this
  prerequisite, the correct liner must be specified
  by the engineer.
• Buried duct used for the heating and cooling
  supply requires R4 insulation except Climate 8,
  which requires R6. Ducts used for only heating
  or used only for cooling are subject to less
  stringent requirements. At this time most direct
  burial duct is not insulated. Water infiltration
  can be an issue.

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ENERGY AND ATMOSPHERE

• PREREQUISITE 2 Duct must comply with ASHRAE
  90.1-2007 Section 6.4.4.2 - Ducts and Plenum
  Leakage
• All duct work over 3.0 w.g. must meet leakage
  Class 6 for rectangular duct and Leakage Class 3
  for round and oval duct. This duct leakage must
  be designated on the drawing and tested in the
  field.
• Transverse seams must always be sealed this
  includes all gores of adjustable elbows
• Eastern Tight transverse seams are always
  sealed!
• All longitudinal seams must be sealed except
• Spiral Seams!
• Exhaust in unconditioned spaces or outdoors
• Supply duct lt 2.0 w.g. in conditioned spaces
• Return duct in conditioned spaces

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INDOOR ENVIRONMENTAL QUALITY

• PREREQUISITE 1 Airstream surfaces must comply
  with ASHRAE 62.1-2007 Section 5.5.1 Resistance
  to Mold Growth
• This section does NOT require the application
  of anti-microbials to any surface. The
  requirement is that all airstream surfaces are
  resistant to mold per ASTM C1388 or UL 181. All
  duct liners used by ESM meet this requirement.
• Blanket type fiberglass used by ESM also meets
  this requirement.
• Sheet metal surfaces and fasteners are exempt
  from this requirements (62.1 pg. 6)
• NOTE Even with this resistance, any
  airstream surface that is continually wetted is
  still subject to mold growth (62.1 pg. 6)

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INDOOR ENVIRONMENTAL QUALITY

• PREREQUISITE 1 Airstream surfaces must comply
  with ASHRAE 62.1-2007 Section 5.5.2 Resistance
  to Erosion
• Duct liners used by ESM meet this requirement
• Sheet metal surfaces are exempt from this
  requirement 62.1 pg 6
• ESM can supply test data showing that dual
  wall duct, with blanket fiberglass insulation,
  covered with a perforated inner shell meets this
  requirement without the use of additional
  barriers.
• Duct liner, which is tested for erosion, behind
  a perforated inner shell meets the requirement
  without further testing.
• This section does not, by itself, require the
  use of Mylar, Tedlar or other barriers

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INDOOR ENVIRONMENTAL QUALITY

• PREREQUISITE 1 Ducts must comply with ASHRAE
  62.1-2007 Section 7.1.3 Protection of Duct from
  Moisture
• When recommended by the manufacturer,
  building materials shall be protected from rain
  and other sources of moisture by appropriate
  in-transit and on-site procedures. (62.1 pg.
  17). ESM ships in van body trailers to meet
  this requirement.
• Protection on-site and removal of visible
  microbial growth are the responsibility of the
  on-site contractor.

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INDOOR ENVIRONMENTAL QUALITY

• PREREQUISITE 1 Ducts must comply with ASHRAE
  62.1-2007 Section 7.1.5- Compliance with Other
  Standards
• SMACNA HVAC DCS
• NFPA 90A
• NFPA 90B Applies to the installation of
  duct only
• ESM strictly adheres to industry standards

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INDOOR ENVIRONMENTAL QUALITY

• PREREQUISITE 3 Minimum Acoustical Performance
  (Schools Only)
• To provide classrooms that are quiet so that
  teachers can speak to the class without
  straining their voices and students can
  effectively communicate with each other and the
  teacher.
• ESM can provide acoustically lined and dual
  wall duct to assist the designer in achieving
  lower noise levels

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LEED CREDITS Impacting Duct Systems Or Not!
MATERIALS AND RESOURCES
ENERGY AND ATMOSPHERE
INDOOR ENVIRONMENTAL QUALITY
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MATERIALS AND RESOURCES
CREDIT 4 - RECYCLED CONTENT and CREDIT 5 -
REGIONAL MATERIAL
Table 1. MR Credit Metrics (pg. 337)
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MATERIALS AND RESOURCES
CREDIT 4 RECYCLED CONTENT Mechanical, electrical
and plumbing components cannot be included in
this calculation v3.0 pg 369 CREDIT 5 REGIONAL
MATERIAL Mechanical, electrical and plumbing
components must not be included in this
calculation v3.0 pg 379
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ENERGY AND ATMOSPHERE

• CREDIT 1 - OPTIMIZE ENERGY PERFORMANCE
• Engineer must demonstrate energy savings via
  whole building model.
• Alternatively, the engineer may follow
  prescriptive path based on building type.
• Engineer must specify actions to achieve these
  requirements.
• Round and oval duct meet leakage Class 3 while
  rectangle duct only meets Class 6 (2x the
  leakage). Engineers should consider greater use
  of ESM round and oval duct systems.

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INDOOR ENVIRONMENTAL QUALITY

• CREDIT 3 and 3.1 CONSTRUCTION IAQ MANAGEMENT
  PLAN
• This section does not anticipate the use of
  the cleanliness levels of SMACNA DUCT
  CLEANLINESS FOR NEW CONSTRUCTION. (DCNC)
• During construction, meet the control measures
  of SMACNA IAQ GUIDELINES FOR BUILDINGS UNDER
  CONSTRUCTION Chapter 3. Note These are on-site
  requirements only.
• The contractor SHOULD protect and seal all
  duct and equipment openings with plastic. (pg.
  455)
• Note This section applies to duct as it is
  installed. No requirement is created for
  wrapping duct work prior to shipment. The design
  team may want to specify a cleanliness level as
  outlined in the DCNC publication as part of a
  comprehensive IAQ management . ESM will be glad
  to provide the service as properly specified.

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INDOOR ENVIRONMENTAL QUALITY

• CREDIT 4.1 LOW EMITTING MATERIALS ADHESIVES
  AND SEALANTS
• All adhesives and sealants used on the
  interior of the building (defined
• as inside the weatherproofing system and
  applied on-site) must
• comply (pg. 471)
• Comply with South Coast Air Quality
  Management (SCAQMD) Rule 1168
• and VOC table. http//www.aqmd.gov/
• Schools (pg 472) must meet California
  Department of Health Services
• Standard Practice for the testing of
  Volatile Organic Emissions from
• Various Sources Using Small-Scale
  Environmental Chambers, including
• 2004 Addenda. http//www.cal-iaq.org/VOC/Sec
  tion01350_7_15_2004_FINAL_PLUS_ADDENDUM-2004-01.pd
  f
• Only sealers supplied by ESM for field
  installation are covered by this section.

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INDOOR ENVIRONMENTAL QUALITY

• CREDIT 4.2 LOW EMITTING MATERIALS PAINTS AND
  COATINGS
• Most Buildings
• Paints and coatings used on the interior of
  the building (defined as inside the
  weatherproofing systems and applied on-site) must
  comply (pg. 481)
• Green Standards GS-11, GS-03 and SCAQMD Rule
  1113
• Only touch up paint as supplied by ESM for
  field use is covered by this section.
• Schools same California standard as
  adhesives/sealants

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INDOOR ENVIRONMENTAL QUALITY

• CREDIT 9 ENHANCED ACOUSTICAL PERFORMANCE
• Schools Only
• STC 35 and 40 dbA background noise
• ESM round and oval spiral ductwork provides
  superior sound attenuation, compared to
  rectangular ductwork.
• ESM dual wall ductwork provides additional
  sound attenuation. ESM can provide test data for
  ESM dual wall ductwork for the design team to
  use.

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INDOOR ENVIRONMENTAL QUALITY

• CREDIT 10 MOLD PREVENTION
• Also schools only
• Design to limit relative humidity to lt 60
• Limiting mold is best achieved by limiting
  moisture
• There is no requirement for the use of
  anti-microbial coatings
• The use of anti-microbial coated steel can be
  considered by the design team as part of this
  credit. ESM can provide material with a Microban
  precoating or ESM can provide other, ESM
  applied, coatings such as Portersept

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CONCLUSIONS PREREQUISITES

• LEED requires no changes to the normal
  production of ESM.
• It is the design teams responsibility to
  correctly specify insulation requirements by
  system
• Lined duct must be protected from moisture in
  transit and on the job site ESM ships ductwork
  in closed van body trailers, protected from the
  weather. This prerequisite does not require
  wrapping at the factory
• ESM Submittals are not required for
• Recycled Content
• Regional Materials
• Adhesive, sealant and VOC except when supplied
  for job site
• touch up.

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CONCLUSIONS CREDITS

• The use of low leakage ESM round and oval duct
  should be used as part of achieving EA C1.
  Eastern Tight and Eastern Flanges are
  important tools for meeting Class 3 Leakage.
• The use of ESM lined and dual wall duct
  exceeding the requirements of ASHRAE 90.1 should
  be encouraged as part of EA C1.
• The use of ESM lined and dual wall duct do
  provide better acoustical performance than
  unlined and single wall duct and can also be part
  of achieving IEQ C9 for schools.
• ESM can provide anti-microbial coatings as
  part of a mold prevention plan for IEQC10
• ESM can wrap and clean ductwork prior to
  shipping as part of a comprehensive IAQ
  Management plan for IEQ C10

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LEED 2009 EDITION AND DUCT SYSTEMS
Demystifying Prerequisites and Credits