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Filter located and installed so as to facilitate access and regular service by the owner

Filter located and installed so as to facilitate access and regular service by the owner
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Flex ducts are compressed

Flex ducts are compressed
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Flexible ducts in unconditioned space not installed in cavities smaller than outer duct diameter; in conditioned space not installed in cavities smaller than inner duct diameter

Flexible ducts in unconditioned space not installed in cavities smaller than outer duct diameter; in conditioned space not installed in cavities smaller than inner duct diameter
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Flexible ducts supported at intervals as recommended by mfr. but at a distance ≤ 5 ft

Flexible ducts supported at intervals as recommended by mfr. but at a distance ≤ 5 ft
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For better temperature distribution and air quality, every bedroom and all of the common spaces in this home have ducted returns to the central heat pump and all bathroom exhaust fans are controlled by a condensation sensor and timer switch.

For better temperature distribution and air quality, every bedroom and all of the common spaces in this home have ducted returns to the central heat pump and all bathroom exhaust fans are controlled by a condensation sensor and timer switch.
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For fireplaces that are not mechanically drafted or direct-vented to outdoors, total net rated exhaust flow of the two largest exhaust fans is .15 CFM per 100 sq. ft. of occupiable space when at full capacity

For fireplaces that are not mechanically drafted or direct-vented to outdoors, total net rated exhaust flow of the two largest exhaust fans is .15 CFM per 100 sq. ft. of occupiable space when at full capacity
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For homes with heating registers in the ceiling or floor, air seal where the duct boots meet the ceiling drywall or the flooring to prevent heat loss around the register.

For homes with heating registers in the ceiling or floor, air seal where the duct boots meet the ceiling drywall or the flooring to prevent heat loss around the register.
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Formula 4.2 from ASHRAE 62.2-2010 for fan flow rate required to achieve an effective ventilation rate

Formula 4.2 from ASHRAE 62.2-2010 for fan flow rate required to achieve an effective ventilation rate
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Framing allowed duct work to be properly installed without compression

Framing allowed duct work to be properly installed without compression
CAD File:

Front view of horizontal air handler showing condensate drain pans and drain lines

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Front view of horizontal air handler showing condensate drain pans and drain lines
CAD File:

Front view of horizontal air handler showing condensate drain pans, pipes, and controls

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Front view of horizontal air handler showing condensate drain pans, pipes, and controls
CAD File:

Front view of horizontal air handler showing outdoor air intake, dampers, supply and return, and condensate drain pans, drain pipe and trap, and drain overflow safety cut off switch

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Front view of horizontal air handler showing outdoor air intake, dampers, supply and return, and condensate drain pans, drain pipe and trap, and drain overflow safety cut off switch
CAD File:

Front view of horizontal air handler showing outdoor air intake, dampers, supply and return, emergency drain pan, and drain overflow safety cut off switch

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Front view of horizontal air handler showing outdoor air intake, dampers, supply and return, emergency drain pan, and drain overflow safety cut off switch
CAD File:

Front view of vertical air handler condensate disposal and controls

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Front view of vertical air handler condensate disposal and controls
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Function of controls is not obvious

Function of controls is not obvious
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Function of ventilation controls is obvious (e.g., bathroom exhaust fan) or, if not, controls have been labeled

Function of ventilation controls is obvious (e.g., bathroom exhaust fan) or, if not, controls have been labeled
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Furnace filter resistance varies by surface area; deeper pleats add surface area

Furnace filter resistance varies by surface area; deeper pleats add surface area
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Furnace filters that are MERV 6 or higher protect the HVAC equipment and improve indoor air quality

Furnace filters that are MERV 6 or higher protect the HVAC equipment and improve indoor air quality
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Furnaces, boilers, and water heaters located within the home’s pressure boundary are mechanically drafted or direct-vented

Furnaces, boilers, and water heaters located within the home’s pressure boundary are mechanically drafted or direct-vented
Case Study:

Greenbrier Prototype, Oakdale, Connecticut

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Grill and duct size based on calculated requirements for net free area

Grill and duct size based on calculated requirements for net free area
Case Study:

Habitat for Humanity Cold Climate High R-Value Prototype, Westford, Massachusetts

Case Study:

Habitat for Humanity High R-Value Prototype

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Hand tools for cutting fiber board sheets include a knife, straight edge, and color-coded edge-cutting tools

Hand tools for cutting fiber board sheets include a knife, straight edge, and color-coded edge-cutting tools