High Performing Buildings - Spring 2009 - (Page 59) A return grille for the basement air handler is located at base of main stairwell. Mechanical systems upgrades in the basement include an air handler, high efficiency boiler and a super insulated water tank. floor hallway and another is in the attic. Transfer grilles over the doors to the bedrooms on the second floor prevent room pressurization due to inadequate return paths. Each air handler is equipped with a MERV 13, 5-in. pleated media filter. Providing air change with a controlled mechanical ventilation system is important for interior moisture control and for good indoor air quality. There is an outside air duct to the return of each air handler with a manual damper, which provides ventilation during air handler run time. Four individual exhaust fans (one in each bath and powder room) and a ducted exhaust over the gas range provide source control of pollutants. The actual equipment installed includes the following: 80,000 Btu/h input 92% AFUE condensing gas modulating low-mass boiler (25,000 to 74,000 Btu/h nominal output); Variable speed/ECM (electronically commutated motor) air handler (x2); 2.5-ton 14 seasonal energy efficiency ratio (SEER) outdoor condenser unit with R-410a refrigerant (upstairs air handler only); MERV 13 pleated media (5-in. thick) filters on air handlers; Keeping the existing plaster, wood trim and maple floors makes this home beautiful as well as comfortable and energy efficient. Low-sone 50 cfm bathroom exhaust fans; and 600 cfm exhaust range. spring 2009 HigH Performing Buildings 59
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