BPI Building Analyst

What are the three primary mechanisms of heat transfer that a Building Analyst must understand when evaluating a home's thermal performance?

• AConvection, radiation, and evaporation
• BConduction, convection, and radiation
• CConduction, infiltration, and radiation
• DConvection, condensation, and conduction

Which of the following best describes the stack effect in a building?

• AWarm air rises and exits through upper openings while cooler replacement air enters throu…
• BWind pressure forces air through cracks in the building envelope
• CMechanical systems create positive pressure in the upper floors
• DCold air sinks and creates negative pressure at the ceiling level

What is the neutral pressure plane in a building?

• AThe floor level where the HVAC system operates at peak efficiency
• BThe height at which indoor and outdoor air pressures are equal due to the stack effect
• CThe area of the building with the least air infiltration
• DThe point where supply and return duct pressures balance

During a blower door test, what does CFM50 represent?

• AThe cubic feet per minute of conditioned air delivered by the HVAC system at 50% capacity
• BThe cubic feet per minute of air flowing through the building envelope at 50 Pascals of p…
• CThe cubic feet per minute of duct leakage at 50 Pascals total external static pressure
• DThe natural air leakage rate of the building expressed at 50 degrees Fahrenheit

What is the correct formula for calculating ACH50 from a blower door test?

• AACH50 = CFM50 / building volume
• BACH50 = (CFM50 x 60) / building volume
• CACH50 = CFM50 x building volume / 60
• DACH50 = (CFM50 / 60) x building volume

A blower door test measures 2,400 CFM50 in a home with a conditioned volume of 14,400 cubic feet. What is the ACH50?

• A5.0
• B6.0
• C10.0
• D16.7

What is the purpose of the LBL N-factor (also called the correlation factor) used in converting ACH50 to ACHnat?

• ATo account for duct leakage effects on natural infiltration
• BTo adjust for climate, building height, and wind shielding to estimate natural infiltrati…
• CTo correct for measurement error in the blower door fan
• DTo account for the difference between indoor and outdoor humidity levels

During a blower door test, what should a Building Analyst do if the house cannot reach 50 Pascals of depressurization?

• AReport that the test cannot be completed and the house is too leaky to test
• BUse a multi-point test approach and extrapolate the result to 50 Pascals
• CIncrease the blower door fan speed beyond its rated capacity
• DSeal the largest visible leaks and then retest

What is the primary purpose of depressurizing a building during a blower door test?

• ATo simulate the effects of a strong windstorm on the building envelope
• BTo create a uniform pressure difference across the entire building envelope so that all a…
• CTo test the structural integrity of windows and doors
• DTo verify that the HVAC system can maintain indoor air quality

According to BPI standards, what is the maximum allowable CAZ depressurization for a Category I atmospherically vented water heater operating alone?

• A-2 Pascals
• B-3 Pascals
• C-5 Pascals
• D-15 Pascals

When performing worst-case depressurization testing in the CAZ, which of the following actions should the Building Analyst take to create worst-case conditions?

• AOpen all exterior doors and windows, then turn on all exhaust fans
• BClose all exterior doors and windows, turn on all exhaust fans, close interior doors to t…
• COpen all interior doors, turn off all exhaust fans, and close exterior doors
• DSeal all supply registers and return grilles, then operate the dryer

During combustion safety testing, if CO in undiluted flue gases from a furnace exceeds what threshold, corrective action is required per BPI standards?

• A26 ppm as measured
• B100 ppm as measured
• C200 ppm as measured
• D400 ppm as measured

During combustion safety testing, at what ambient CO level in the CAZ must the Building Analyst abort the test and take immediate action?

• A9 ppm
• B25 ppm
• C35 ppm
• D70 ppm

When performing a spillage test on a natural draft water heater, how is spillage detected?

• ABy measuring the temperature differential between the flue pipe and the room
• BBy using a smoke pencil or mirror at the draft diverter to check for exhaust gases escapi…
• CBy measuring the oxygen content of the room air near the appliance
• DBy checking the condensation on the exterior of the flue pipe

According to ASHRAE 62.2, what is the formula for calculating the minimum whole-building mechanical ventilation rate for a dwelling?

• AVentilation (cfm) = 0.01 x floor area (sq ft) + 7.5 x (number of bedrooms + 1)
• BVentilation (cfm) = 0.03 x floor area (sq ft) + 15 x number of bedrooms
• CVentilation (cfm) = 0.05 x volume (cu ft) + 5 x number of occupants
• DVentilation (cfm) = 0.02 x floor area (sq ft) + 10 x (number of bedrooms + 1)

Using ASHRAE 62.2, what is the minimum continuous mechanical ventilation rate for a 1,800 sq ft home with 3 bedrooms?

• A33 cfm
• B48 cfm
• C52 cfm
• D63 cfm

What type of mechanical ventilation system provides both supply and exhaust airflow and can include heat recovery?

• AExhaust-only system
• BSupply-only system
• CBalanced ventilation system
• DSpot ventilation system

What is the key difference between a Heat Recovery Ventilator (HRV) and an Energy Recovery Ventilator (ERV)?

• AAn HRV uses a compressor while an ERV uses a desiccant wheel
• BAn HRV recovers only sensible heat while an ERV recovers both sensible and latent heat (m…
• CAn ERV works only in cooling climates while an HRV works only in heating climates
• DAn HRV is a balanced system while an ERV is an exhaust-only system

An exhaust-only ventilation system creates what type of pressure condition inside a home?

• APositive pressure, which pushes indoor air out through envelope leaks
• BNegative pressure, which draws outdoor air in through envelope leaks
• CNeutral pressure, which balances indoor and outdoor air
• DVariable pressure depending on the outdoor temperature

What is the minimum continuous exhaust rate required by ASHRAE 62.2 for a kitchen without a range hood vented to the outdoors?

• A20 cfm
• B50 cfm
• C5 ACH of the kitchen volume
• D100 cfm intermittent or equivalent continuous

What is the ASHRAE 62.2 intermittent exhaust requirement for a bathroom?

• A25 cfm
• B50 cfm
• C75 cfm
• D100 cfm

In ASHRAE 62.2, what does the infiltration credit allow a Building Analyst to do?

• AReduce the required mechanical ventilation rate based on the measured natural air infiltr…
• BIncrease the blower door test result to account for wind effects
• CEliminate the need for any mechanical ventilation if the building is sufficiently leaky
• DCredit exhaust fan operation toward the whole-building ventilation requirement

Which of the following is the correct order for evaluating HVAC distribution system performance?

• AMeasure duct leakage, then check airflow at registers, then inspect duct insulation
• BInspect duct insulation, then measure duct leakage, then check filter condition
• CAssess the overall system, then perform room-by-room pressure diagnostics, then measure d…
• DCheck thermostat settings, then measure static pressure, then inspect refrigerant charge

What does a room-by-room pressure test help a Building Analyst identify?

• AThe total air leakage of the building envelope
• BDuct leakage and airflow imbalances that create pressure differences between rooms and th…
• CThe efficiency rating of the HVAC equipment
• DWhether the thermostat is calibrated correctly

What is the primary concern when supply ducts are located in an unconditioned attic?

• AThe attic structure may not support the weight of the ductwork
• BConditioned air is lost through duct leaks to the outdoors, and the temperature differenc…
• CThe homeowner cannot access the ducts for filter changes
• DThe ducts may restrict natural ventilation of the attic space

What is the total external static pressure (TESP) of an HVAC system, and why is it important?

• AIt is the outdoor barometric pressure; it affects combustion efficiency
• BIt is the sum of all pressure drops across the supply and return sides of the air handler…
• CIt is the pressure difference between the supply plenum and the conditioned space; it det…
• DIt is the pressure created by the blower door fan; it is used to calculate duct leakage

When closing interior doors in a home with a central return, what effect does this typically have on room pressures?

• ARooms with supply registers become depressurized and the main body becomes pressurized
• BRooms with supply registers become pressurized relative to the main body where the return…
• CAll room pressures remain neutral because the system is balanced
• DThe main body becomes depressurized and all bedrooms remain at neutral pressure

What does the R-value of insulation measure?

• AThe rate at which heat passes through the material in BTU per hour
• BThe resistance of the material to conductive heat flow
• CThe reflective capacity of the material's surface
• DThe material's ability to block air infiltration

A Building Analyst inspects an attic and finds fiberglass batt insulation rated at R-19. However, the batts are compressed from their original 6.25 inches to approximately 3.5 inches. What is the effect on the insulation's thermal performance?

• AThe R-value increases because the material is denser
• BThe R-value remains R-19 because the material amount has not changed
• CThe R-value decreases significantly because compressed insulation loses its ability to tr…
• DThe R-value drops to zero because the insulation is no longer functional

What is the relationship between the thermal boundary and the pressure boundary in a building?

• AThey are unrelated; thermal boundary controls heat and pressure boundary controls structu…
• BThey should be aligned and in contact with each other for optimal building performance
• CThe thermal boundary should always be inside the pressure boundary
• DThe pressure boundary must be at least twice the R-value of the thermal boundary

What is convective looping in the context of building insulation?

• AWarm air circulating through the HVAC duct system
• BAir currents circulating through or behind insulation, carrying heat around the insulatio…
• CThe natural convection pattern of hot air rising through a chimney flue
• DThe movement of warm air between floors through open stairways

When inspecting insulation in a building, why is the RESNET insulation grading system important for a Building Analyst?

• AIt determines the fire rating of the insulation material
• BIt evaluates the quality of insulation installation based on coverage, compression, and g…
• CIt rates the environmental impact of different insulation materials
• DIt measures the moisture absorption characteristics of insulation

Where is the thermal boundary typically located in a home with a vented attic?

• AAt the roof deck (underside of the roof sheathing)
• BAt the ceiling plane (top of the top-story ceiling)
• CAt the midpoint between the ceiling and the roof peak
• DAt the soffit vents along the eave line

What is thermal bridging?

• AHeat transfer through air leaks in the building envelope
• BHeat transfer through structural elements such as studs, joists, and headers that have lo…
• CThe process of using a thermal imaging camera to find heat loss
• DTemperature differences between the supply and return air in an HVAC system

A Building Analyst uses an infrared camera during a blower door test. What is the primary advantage of combining these two diagnostic tools?

• AThe blower door creates temperature differences that make insulation defects visible on t…
• BThe blower door exaggerates air leakage pathways, making them more visible as temperature…
• CThe infrared camera can measure the CFM50 more accurately than the blower door manometer
• DThe blower door equalizes temperatures throughout the house so the infrared camera can de…

What is the primary difference between a sealed combustion (direct-vent) appliance and an atmospherically vented appliance?

• ASealed combustion appliances are always more efficient than atmospherically vented ones
• BSealed combustion appliances draw combustion air from outdoors through a dedicated pipe,…
• CAtmospherically vented appliances cannot produce carbon monoxide
• DSealed combustion appliances do not require a flue or chimney

What is the Annual Fuel Utilization Efficiency (AFUE) rating?

• AThe percentage of fuel energy converted to useful heat over an entire heating season, acc…
• BThe instantaneous combustion efficiency measured at steady-state operation
• CThe ratio of electricity consumed to heat output in a heat pump
• DThe percentage of time the furnace operates during a heating season

What is the Seasonal Energy Efficiency Ratio (SEER) and what type of equipment does it rate?

• AThe ratio of heating output to electricity input for heat pumps, measured over a heating…
• BThe ratio of cooling output in BTUs to electricity input in watt-hours over a typical coo…
• CThe efficiency of a gas furnace measured seasonally
• DThe ratio of ventilation airflow to fan energy consumption

A Building Analyst is evaluating a heat pump system. What does the Heating Seasonal Performance Factor (HSPF) measure?

• AThe ratio of cooling output to electrical input during the heating season
• BThe ratio of total heating output in BTUs to total electricity consumed in watt-hours ove…
• CThe maximum heating capacity of the heat pump at the design temperature
• DThe defrost cycle frequency in cold weather

What is the Energy Factor (EF) for a domestic water heater, and what does a higher value indicate?

• AIt is the ratio of electrical resistance to gas input; higher is less efficient
• BIt is the ratio of useful energy delivered in heated water to total energy consumed; high…
• CIt is the recovery rate in gallons per hour; higher means faster heating
• DIt is the standby heat loss rate in BTU per hour; higher means more loss

A Building Analyst measures steady-state combustion efficiency on a natural gas furnace and records: flue temperature 350°F, room temperature 70°F, and 8% oxygen in the flue gas. What can the analyst conclude?

• AThe furnace is operating at peak efficiency with optimal air-fuel ratio
• BThe furnace has excess combustion air and moderate heat loss up the flue, indicating room…
• CThe furnace requires immediate shutdown due to dangerous conditions
• DThe furnace needs less combustion air to improve efficiency

What is the recommended minimum temperature rise across the heat exchanger of a forced-air gas furnace, and where is this specification found?

• A30°F, found in the building code
• BThe manufacturer's nameplate specifies the acceptable range, typically 35-65°F for most f…
• C50°F, found in the ASHRAE handbook
• D70°F, found in the BPI standards

What is the primary health concern associated with moisture accumulation in wall cavities?

• AStructural collapse due to wood rot
• BMold growth, which can release spores that cause respiratory health problems
• CIncreased electrical resistance in wiring
• DDegradation of paint on exterior surfaces

At what relative humidity level does mold growth become a concern on most building materials?

• AAbove 40%
• BAbove 50%
• CAbove 60%
• DAbove 80%

A Building Analyst discovers knob-and-tube wiring in an attic that currently has no insulation. What is the appropriate recommendation?

• AInstall blown-in cellulose insulation directly over the knob-and-tube wiring
• BInstall fiberglass batts leaving a 3-inch gap around all wiring
• CDo not insulate the attic until a licensed electrician evaluates and potentially upgrades…
• DCover the wiring with rigid foam board and then add insulation

What is the BPI standard for carbon monoxide detector placement in a home?

• AOne detector on each floor and within 15 feet of each sleeping area
• BOne detector in the basement and one in the attic only
• COne detector adjacent to each combustion appliance only
• DDetectors are recommended but placement is at the homeowner's discretion

What is the primary concern when air sealing a home that has atmospheric combustion appliances?

• AThe air sealing work may void the warranty on the combustion equipment
• BTightening the envelope may depressurize the home enough to cause backdrafting of combust…
• CAir sealing reduces the humidity level, which can damage combustion equipment
• DThe sealant materials may off-gas toxic fumes near open flames