Energy Rated Homes of Utah Utah Energy Conservation Coalition

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Energy Rated Homes of UtahUtah Energy
Conservation Coalition
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Duct System Diagnostic Field Guide
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Diagnostic Tools
P Digital Monometer P Flow Hood P Blower
Door P Duct Blaster P Pressure Pan P Door
Gauge P CO Tester
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Digital Manometer

• Measures Pressure Differences
• lt Determines Zonal Pressure
• lt Plenum Pressure
• lt Determine Dominant Duct Leak
• lt Declare Duct Location
• lt Combustion Appliance Z? Test
• lt Chimney Draft Test

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Flow Hood
P Measures Airflow lt Supply Flows lt Return
Flows lt Ventilation Flows
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Blower Door
P Measures House Leakage Area lt CFM 50 Test lt
Duct Leakage Tests lt Minimum Ventilation Level
(MVL)
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Duct Tester
P Quantify Duct Leakage lt Total Leakage lt
Leakage to Exterior lt Supply/Return Leakage lt
Air Handler Fan Flow
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Pressure Pan
P Qualitative Test for Duct Leakage
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CO Monitor
P Measures Carbon Monoxide lt Ambient Test lt
Appliance Test
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Door Gauge
P Determine Area Required to Provide Pressure
Relief Between Rooms
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Field Testing
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Dominant Duct Leak Test
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Dominant Duct Leak Test
P Measure pressure across the building
envelope. ltAir handler off ltAir handler on
P Calculate the difference.
2.4PA Indoors WRT outdoors, Air Handler
off. 0.3PA Indoors WRT outdoors, Air Handler
on. -2.1PA Air Handler Induced Pressure.
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Dominant Duct Leak Test
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Dominant Duct Leak Test
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Basic Blower Door Test (CFM 50)
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Basic Blower Door Test (CFM 50)
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Record Data Determine CFM50
P Fan Pressure P Hole Size (ring size) P CFM50
from the tables in the book
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Locate Air Leakage Paths
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Read Zone Pressures
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Read Zone Pressures
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Read Zone Pressures
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Read Zones Pressures
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Duct Pan/Block Test
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Pressure Pan
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Pressure Block
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Pressure Pan/Block Test
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Develop a Profile of Duct Leaks
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Define Leak Location
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Split System Pressure Pan Test
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Total Duct Leakage
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Total Duct Leakage
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Duct Leakage to Outdoors
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Duct Leakage to Outdoors
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Duct Leakage to Outdoors
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Duct Leakage to Outdoors
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Duct Leakage to Outdoors
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Duct Leakage to Outdoors
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Duct Leakage to Outdoors
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Combustion Appliance Safety Tests
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Carbon Monoxide Testing??
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CAZ Test-Air Handler Effect Interior Door Set Up
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CAZ Test-Air Handler Effect Interior Door Set Up
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CAZ Test-Air Handler Effect Interior Door Set Up
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Set Up Worst Case CAZ Pressures
P Basic Procedure lt Close all exterior doors
and windows lt Turn on the Air Handler lt Close
all interior doors lt Turn on all exhaust
devices lt Measure CAZ WRT outdoors
Is the CAZ depressurized in excess of the
recommended house Depressurization Limits?
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After Duct Sealing Prediction
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1994 UMC 706

• Conditions Created By Mechanical Exhausting

P Operation of exhaust fans, kitchen ventilation
systems, clothes dryers or fireplaces shall be
considered in determining combustion air
requirements to avoid unsatisfactory operation of
installed gas appliances.
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House Depressurization Limits (HDL)
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Utah Energy Conservation Coalition Energy Rated
Homes of Utah