Change out Duct Testing

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Welcome
Duct Testing Requirements forHVAC System
Change-outs
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• This program is funded by California utility
  customers and administered by Pacific Gas and
  Electric Company, under the auspices of the
  California Public Utilities Commission.

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www.pge.com/stockton
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Douglas Beaman

• Douglas Beaman Associates
• 612 13th Street
• Modesto, CA 95354
• [phone]
• Gary_at_DougBeaman.com

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CEC Website

• New Standards and Manuals can be downloaded at
• www.energy.ca.gov/title24

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Blueprint is a newsletter of the California
Energy Commission. It focuses on California's
Title 24 Building Efficiency Standards.
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• Download or subscribe at

http//www.energy.ca.gov/efficiency/blueprint/
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How-To Videos
California Energy Commission videos http//www.co
nsumerenergycenter.com/videos/
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Why Change-Outs?

• Energy Standards are starting to address energy
  efficiency of existing homes and businesses as
  well as new buildings.

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Duct Testing

• 1. Residential New Construction
• 2. NonResidential New Construction
• 3. Residential HVAC System Change-outs (in some
  climate zones)
• 4. NonResidential HVAC Change-outs (in all
  climate zones)

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Typical Leakage Rates for Residential Systems

• Statewide average duct leakage in existing
  residential systems 28 - 35
• 3-ton _at_ 400 cfm 1200 .28 336 cfm

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Quick Review of Common Duct Problems
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Residential HVAC Change-outs

• Duct systems must be tested sealed if ALL of
  the following conditions apply
• Building permit applied for on or after October
  1, 2005

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Climate Zones

• Residential Duct Testing Rules
• Apply ONLY in Climate Zones 2, 9, 10, 11,
  12, 13, 14, 15 16
• Exempt Climate Zones 1, 3, 4, 5, 6, 7, 8

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California Climate Zones
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Ducts in Unconditioned Space

• At least 40 linear feet of duct work must be
  located in unconditioned space.

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Asbestos Exemption

• Ductwork made with or insulated with asbestos is
  EXEMPT

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Duct Testing Required When Any of the Following
Components are Replaced

• Air handler or furnace
• Outdoor condensing unit (split systems)
• Heating or cooling coil
• Furnace heat exchanger
• Package unit

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Additional Ductwork

• Adding or replacing 40 linear feet or more of
  duct work in unconditioned space

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Maximum Leakage RateExisting Duct Work

• 1. 15 of fan flow
• 400 cfm/ton .15 60 cfm3 tons 60 cfm 180
  cfm target
• or
• 2. 60 Reduction
• Test before replacement and after
• 600 cfm initial test (example only) 60
  reduction 240 cfm target
• or

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Maximum Leakage (cont)

• 3. Duct leakage to outside of house 10 or less
  (whole house blower door test plus duct leakage
  test)
• or
• 4. Seal all accessible leaks and verify by HERS
  Rater (with smoke)

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Maximum Leakage RatesCompletely New Duct System

• HVAC system change-outs that include all new duct
  work same duct testing standards as new
  construction.
• 6 of air flow (24 cfm / ton)

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Verification

• 1. Contractor tests
• 2. HERS Rater verifies

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Residential Alternatives

• Are there any alternatives to performing the
  duct sealing and testing?

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Option 1

• Climate Zones 2, 12, 16 only
• 0.92 AFUE Furnace

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Option 2

• Climate Zones 10, 13, 15 only
• SEER 14
• EER 12
• TXV
• R-8 insulation on all new duct work
• Additional R-4 on all existing duct work

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Option 3 All Climate Zones

• SEER 14
• EER 12
• TXV
• Plus
• 0.82 AFUE Furnace
• R-8 insulation on all new duct work
• Additional R-4 on all existing duct work

SEER 14 EER 12 TXV Plus 0.92 AFUE Furnace
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TXV

• Options 2 3 do not require TXVs with package
  systems.

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October 1, 2005

• NonResidential Duct systems must be sealed when
  all of the following apply
• Permit applied for on or after October 1, 2005
  
• And (next page)

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Unconditioned Space

• At least 25 of ductwork is outdoors or in
  unconditioned space
• And (next page)

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Climate Zones

• NonResidential Duct Testing Rules
• Apply in ALL Climate Zones
• And (next page)

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Asbestos Exemption

• Ductwork made with or insulated with asbestos is
  EXEMPT
• And (next page)

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Constant Volume

• Constant volume package or split system
• (not a VAV system)
• And (next page)

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5,000 s.f. each unit

• Each HVAC unit serves 5,000 s.f. or less floor
  area.Rules still apply if total area is greater,
  as long as each unit serves only 5,000 s.f.
• And (next page)

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Scope of Work

• Air handler or furnace
• Outdoor condensing unit (split systems)
• Heating or cooling coil
• Furnace heat exchanger
• Package unit

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Maximum LeakageExisting Ductwork

• 1. 15 of fan flow
• 400 cfm/ton .15 60 cfm3 tons 60 cfm 180
  cfm target
• 2. 60 Reduction
• Test before and after replacement
• For example 600 cfm initial test 60 reduction
  240 cfm target

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Maximum Leakage (cont)

• 3. Seal all accessible leaks verified by HERS
  Rater (usually with smoke)

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Maximum LeakageCompletely New Duct System

• HVAC system change-outs that include all new duct
  work
• 6 of air flow (24 cfm / ton)

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NonRes Alternatives

• Are there any alternatives to performing the
  duct sealing and testing?

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