What additional requirements are there for Duct Sealing?

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What additional requirements are there for Duct Sealing?

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• Duct systems located partially or entirely in conditioned or unintentionally conditioned spaces, such as furnace rooms and unfinished basements, do not qualify for the rebate. • Duct sealing rebate applications submitted with pretest leakage percentage of under 20% or over 60% will be rejected. • We recommend the following formula for use in determining system heating airflow capacity for duct sealing: Furnace output rating in BTUs/HR divided by (1.08 X (furnace outlet plenum temperature minus furnace inlet return temperature in Fahrenheit)). For example: 90,000 BTU furnace output divided by (1.08 x (150°F – 60°F)), or 90,000 divided by (1.08 x 90), or 90,000 divided by 97.2 = 926 cfm system heating airflow capacity Additional Duct Sealing Notes: • Both the pretest and post test must be performed on the system after the newly installed furnace is in place and fully functioning. • The furnace must be allowed to reach steady state maximum operating temperature at maximum blower heating

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