Methodology 1: Modified Blower Door Subtraction Determine Duct Leakage rate before and after performing duct sealing CFM50DL = Calculate duct leakage reduction, convert to CFM25DL and factor in Supply and Return Loss Factors = ΔCFM25DL Calculate Energy Savings Methodology 2: RESNET Test 803.7 Determine Duct Leakage rate before and after performing duct sealing = ΔCFM25DB Calculate Energy Savings Methodology 3: Evaluation of Distribution Efficiency Determine Distribution Efficiency by evaluating duct system before and after duct sealing using Building Performance Institute Efficiency Look-Up “Distribution Table” Summer Coincident Peak Demand Savings Table : Duct Sealing – Values and References Term Unit Value Source CF , Demand Coincidence Factor (See Decimal Default = 0.647 11 Section 1.5) for central AC systems CFM50whole house , Duct leakage at 50 EDC Data EDC Data Gathering Pascal pressure differential Gathering CFM25DB , Cubic feet per minute of air EDC Data Gathering 12 leaving the duct system at 25 Pascals CFM25BASE , Standard Duct Leakage test result at 25 Pascal pressure differential of EDC Data Gathering 12 the duct system prior to sealing, calculated from the duct blaster fan flow chart CFM25EE , Standard Duct Leakage test EDC Data Gathering 12
Methodology 1: Modified Blower Door Subtraction Determine Duct Leakage rate before and after performing duct sealing CFM50DL = Calculate duct leakage reduction, convert to CFM25DL and factor in Supply and Return Loss Factors ΔCFM25DL = Calculate Energy Savings Methodology 2: RESNET Test 803.7 Determine Duct Leakage rate before and after performing duct sealing ΔCFM25DB = Calculate Energy Savings Methodology 3: Evaluation of Distribution Efficiency Determine Distribution Efficiency by evaluating duct system before and after duct sealing using Building Performance Institute “Distribution Efficiency Look-Up Table” Summer Coincident Peak Demand Savings Table : Duct Sealing – Values and References Term Unit Value Source CF , Demand Coincidence Factor (See Section 1.5) for central AC systems Decimal Default = 0.647 11 CFM50whole house , Duct leakage at 50 Pascal pressure differential EDC Data Gathering EDC Data Gathering CFM25DB , Cubic feet per minute of air leaving the duct system at 25 Pascals EDC Data Gathering 12 CFM25BASE , Standard Duct Leakage test result at 25 Pascal pressure differential of the duct system prior to sealing, calculated from the duct blaster fan flow chart EDC Data Gathering 12 CFM25EE , Standard Duct Leakage test EDC Data Gathering 12
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