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A direct-vent sealed-combustion fireplace takes its combustion air directly from outside through a dedicated air inlet and vents combustion products directly outside
A direct-vent sealed-combustion furnace has dedicated pipes for combustion air and exhaust
A fresh air inlet is ducted to the return side of the home’s central air handler; a motorized damper and electronic controls help balance the flow of fresh incoming air with controlled exhaust to meet ventilation requirements
A heat recovery ventilator supplies all living spaces with fresh air while transferring heat for energy savings.
A triple-filtered energy recovery ventilator is installed with individual supply ducts to provide fresh air to each room.
A ventilation controller with a manual override is located on a central air handler fan that is located in an accessible location
Air inlet is located in a convenient place for homeowner to clean
Air inlet is not convenient for cleaning and located next to exhaust outlets
All of the exhaust fans are wired to one labeled switch at the electrical panel
An electronic controller operates an exhaust fan, a mechanical damper on a fresh air intake, and the central heat pump’s fan, which draws in fresh air through the damper and distributes it in sync with exhaust fan operation for balanced fresh air.
An energy recovery ventilator draws in fresh outside air that is filtered and circulated by the central air handler, while stale air from central returns is routed through the ERV to exchange heat before being exhausted outside.
An energy recovery ventilator provides filtered fresh air to every room in the house.
An energy recovery ventilator with a MERV 13 filter supplies clean, fresh air to the entire home.
An ERV provides fresh air to the home while removing stale air and recovering heat.
An HRV or ERV provides balanced ventilation
Bathroom exhaust fans are timer-operated to encourage removal of moisture from the home.
Because flue temperatures are cool, intake and exhaust ducts on a Category 4 direct-vent sealed-combustion condensing furnace can be made of PVC
Central-fan-integrated supply ventilation with exhaust fans for intermittently balanced whole-house ventilation
Continuously-operating ventilation & exhaust fans include readily accessible override controls
Direct vent appliance installed
Exhaust duct is well supported by framing and support straps
Exhaust duct only mechanically fastened and not sealed
Exhaust fan installed but in wrong direction causing excessive bend and duct is uninsulated
Exhaust terminates inside of soffit and was just covered
Exhaust terminates to the outside away from air inlets
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
Formula 4.2 from ASHRAE 62.2-2010 for fan flow rate required to achieve an effective ventilation rate
Fresh air inlet located in ceiling of covered porch
Fresh air inlet located in eave of roof
Fresh air inlet on side of house
Furnaces, boilers, and water heaters located within the home’s pressure boundary are mechanically drafted or direct-vented
Heat Recovery Ventilator (HRV) or Energy (Enthalpy) Recovery Ventilator (ERV)
In line exhaust ventilation installed
Kitchen exhaust properly installed and sealed with mastic
Mesh screen is correctly installed and gaps are less than 0.5 in.
Mesh screen is correctly installed and gaps are less than 0.5 in.
Mesh screen is spaced wider than 0.5 in. allowing insects to enter
Mesh screen is spaced wider than 0.5 in. allowing insects to enter
National Fuel Gas Code (NFPA 2012) identifies four categories for combustion furnaces and water heaters based on combustion type (sealed or unsealed) and vent pipe temperature
Naturally drafted heater installed. Requires combustion safety testing
Naturally drafted water heater installed. Requires combustion safety testing
Override control switches centrally located near thermostat for ease of access
Power vented water heater installed
Properly installed ERV/HRV
Properly installed ERV/HRV
Provide flashing and sealing integrated with the air and water control layers for vents and other roof penetrations
Quiet ENERGY STAR-rated exhaust fans provide spot ventilation and are integrated with the home’s fresh air ventilation system.
Rater-measured ventilation rate is within 100-120% of HVAC contractor design value (2.11)
Supply-only ventilation with a fresh air intake ducted to the return side of a horizontal air handler unit located in the attic
Supply-only ventilation with a fresh air intake ducted to the return side of a vertical air handler unit located in the house
Target Ventilation, Formula 4.1a from ASHRAE 62.2-2010
Test the thermostat fan, cool, and heat settings
The energy recovery ventilator ducts supply filtered outside air to multiple locations in the home and continuously exhaust stale air to provide clean, balanced ventilation.
The energy recovery ventilator operates continuously to provide clean fresh air throughout the home.
The home is equipped with an advanced filtration system capable of removing 99.7% of contaminants from the indoor air.
The natural draft and induced draft furnace are both Category I appliances that receive combustion air from the combustion appliance zone
The raised hood at the base of the vent stack on this water heater shows that it is an atmospheric vented gas water heater
The spray foam-insulated attic provides a temperate place for the ERV ducts, which provide filtered fresh air to every room in the house.
The ultra-efficient ground source heat pump (COP 4.4) delivers conditioned air throughout the home via ducts; an ERV provides fresh air to the system.
The ventilation control is clearly labeled by the installer
The ventilation controller is next to the thermostat and has a manual override button
This bath exhaust fan ventilation control can be set by the HVAC technician for continuous operation, delayed shut off, or a set amount of minutes each hour
This home’s balanced fresh air system includes a filtered fresh air intake that is wired to the central HVAC system with timer controls while exhaust fans in the kitchen, bathrooms, and laundry room pull stale and moist air from the home.
This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home
Ventilation air comes directly from outdoors, not from adjacent dwelling units, garages, crawlspaces, or attics
Ventilation air inlet is too close to exhaust outlet
Ventilation air inlet is too close to exhaust outlet
Ventilation air inlets located ≥10 ft. of stretched-string distance from known contamination sources such as stack, vent, exhaust hood, or vehicle exhaust
Ventilation air inlets provided with rodent / insect screen with ≤ 0.5 inch mesh
Ventilation air inlets ≥ 2 ft. above grade or roof deck in Climate Zones 1-3 or ≥ 4 ft. above grade or roof deck in Climate Zones 4-8 and not obstructed
Ventilation duct is compressed because supporting strap is too small
Ventilation inlet does not terminate high enough above the roof deck
Ventilation inlet is appropriately located above grade
Ventilation inlet is greater than 10 ft. from known contamination source
Ventilation inlet is greater than 10 ft. from known contamination source
Ventilation inlet is not near any exhaust outlets/contamination sources and is at least 2 ft. above the roof deck
Ventilation inlet is not near any exhaust outlets/contamination sources and is at least 2 ft. above the roof deck

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