20120143 Duct Leak Affid 05252012Permit #:
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Duct Leakage Affidavit
House address or lot number: L--iE t T4,1i-b".0, TE 2,4
City: YC- L-" Zip:
Cond. Floor Area (ft):
20 t"V
Source (circle one): Plans Estimated Measured
❑ Duct tightness testing is not required for this residence per exceptions listed at the end of this document
Air Handler in conditigned space? ❑ yes [fno
Circle Test Method: Leakage to Outside
Maximum duct leakage:
Air Handler present during test? 2'yes ❑ no
Total Leakag
Post Construction, total duct leakage: (floor area x.08) = CFM @25 Pa
Post Construction, leakage to outdoors: (floor area x .06) = CFM @25 Pa
Rough -In, total duct leakage with air handler installed: (floor area x.06) _ 12LA CFM @25 Pa
Rough-In, total duct leakage with air handler not installed: (floor area x .04) = CFM @25 Pa
Test Result: 3 "l CFM @25Pa
Ring (circle one if applicable): Open
Duct Tester Location: e4A
Pressure Tap Location: S /A
I certify that these duct leakage rates are accurate and determined using standard duct testing protocol.
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Company Name: $av: -rid tir"A'Fr11+cz Technician: �
Technician Signatu
Washington State Energy Code reference:
Date: 5 -ZS -t2 Phone Number: 25_i $15-3N50
503.10.3 Sealing. All ducts, air handlers, filter boxes, and building cavities used as ducts shall be sealed. Joints and seams shall comply
with Section M1601.3 of the International Residential Code or 603.9 of the International Mechanical Code. Duct tightness testing shall be
conducted to verify that the ducts are sealed. A signed affidavit documenting the test results shall be provided to the jurisdiction having
authority by the testing agent. When required by the building official, the test shall be conducted in the presence of department staff.
Exceptions: 1. Duct tightness test is not required if the air handler and all ducts are located within conditioned space.
2. Duct testing is not required if the furnace is a nondirect vent type combustion appliance installed in an unconditioned space.
A maximum of six feet of connected ductwork in the unconditioned space is allowed. All additional supply and return ducts
shall be within the conditioned space. Ducts outside the conditioned space shall be sealed with a'mastic type duct sealant and
insulated on the exterior with R -8 insulation for above grade ducts and R -5 water resistant insulation when within a slab or
earth.
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Duct testing Calculator (New Construction)
House address or lot #:
Conditioned Floor Area:
Duct tester location:rZ _
Pressure tap location: per,-2
Ring (if applicable): open 1 2 3
- At Rough -in (Total Leakage)
Test Method &
Test'
Calculated
Standardl•
CFM25-
Target
Air Handier Present
06 X CFA <_
<_ 6 CFMu per 100 sf of CFA
_CFM25
Air Handler not Present
_< 4 CFMz, per 100 sf of CFA
04 X —CFA :5 CFM25
Post ConstruCticn
Test Method &
Test
Calculated
Standard'
CFM2s
Target
Air Handler Present (Total Leakage)
.08 X CFA 5 CFMzs
<_ 8 CFMu per 100 sf of CFA
Air Handler Present (Leakage to Exterior)
.06 X —CFA :5 CFM25
<_ 6 CFM25 per 100 sf of CFA
F Test results must comply with one of the Standards options.
Test CFMu must be equal to or less than the calculated target.
Air Let7kwe testing Calculator (Blower Door Test)
Standard
Tested
CFIV1sa
I Calculated Test Result
U/376 CFM-90X0.055) -(%(X T CFA X 144)) = SLA
0.00030 SLA
1370
75 3 s divided by ---v?7 71Z= `SLA
SLA 600z5
Glossary
Rough -in: After installation of the complete air distribution system but before installation of insulation and sheet rack. Allows for
access to all duct seams and connections for re- evaluation of seal integrity if standard is not met in intitiai test.
Post Construction: At or near final inspection. The home must be complete enough to pressurize the home to 25 pa.
Total Leakage: Aggregation of the entire systems duct leakage in a duct test.
Leakage to Exterior: Aggregation of all duct system leaks to the exterior of the CFA in a duct test.
*Leakage
Conditioned floor area
CFMu: Cubic feet per minute of air leakage at 25 pascals of pressure
CFMsa: Cubic feet per minute of air leakage at 50 pascals of pressure
Pascal (pa): Unit of pressure
SLA: Specific leakage area