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EAP Policy Manual FFY24 Chapter 6 Energy Related Repair Page 15 • Sealed combustion two-pipe system except when prevented by a dwelling’s physical conditions. Clearly document in the household file the conditions preventing a two-pipe system . • Burner with a minimum of two (2) stages. • Electronically commutated (EC) motor. For replacement boilers the AFUE must be at least 80% or higher, when possible. Exceptions to installing a high efficiency furnace include situations where physical conditions exist that prevent installation. Biofuel burning furnaces are also exempt. Exceptions must be documented in the household’s file. In mobile homes, the replacement must: • Be certified for use in a mobile home and installed to manufacturers’ specifications. • Be installed as one complete unit from the base of the furnace to the top of the vent on the roof. • Use the same method for supplying combustion air and venting as the original equipment, unless it is a pre-code mobile home. • Be approved by the MN Department of Labor and Industry if it is an alteration to the mobile home. • Alterations to the heating system are allowed in pre-code manufactured homes constructed on or before July 1, 1972. • Have the ducts connected to the furnace cabinet when a furnace with a package air or blend air system is replaced. • Meet the HUD code for drywalling of the furnace and water heater compartments. Additional Criteria • The unit must be properly sized and installed to ensure maximum comfort and efficiency using industry accepted sizing protocols. • Required structural repairs to repair or replace mechanical systems must be in compliance with manufacturer’s specifications. • Ductwork must be designed and installed properly, and leaks minimized through the use of permanent leak reduction technologies; duct tape is insufficient. MN Mechanical Code 1023 (Section 603.9) specifies that ductwork must be sealed with fiberglass tape and mastic or with spray polyurethane foam. • Thermostats or controls installed with the equipment must be designed for use with such equipment. • New, extended, additional or altered wiring to the unit must be performed by a licensed electrician employed by a licensed, bonded and insured electrical contractor. This