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A direct-vent sealed-combustion furnace has dedicated pipes for combustion air and exhaust
At the outlet of the dryer exhaust duct, install a hooded vent with a louvered damper
Back-draft damper still has a piece of tape that prevented it from rattling during shipping
Bathrooms should be equipped with an exhaust fan that vents directly outdoors
Because flue temperatures are cool, intake and exhaust ducts on a Category 4 direct-vent sealed-combustion condensing furnace can be made of PVC
CFM rating may not meet the performance specification once installed
CFM rating may not meet the performance specification once installed
Clothes dryers vented directly to outdoors, except for ventless dryers equipped with a condensate drain
Common exhaust duct not shared by fans in separate dwellings
Direct vent appliance installed
Dryer exhaust duct should vent directly to the exterior via a smooth, rigid metal duct
Dryer exhaust line terminates in the crawlspace
Dryer vent is run vertical with a 90 degree bend and does not vent to the outside
Dryer vents directly to the outdoors
Dryer vents directly to the outdoors
Outdoor unit for a mini split (ductless) heat pump.
Exhaust duct has been mechanically fastened and sealed with mastic
Exhaust duct only mechanically fastened and not sealed
Exhaust duct work and penetration to the exterior have been sealed with mastic
Exhaust duct work and penetration to the exterior have not been sealed
Exhaust fan terminates to the outside
Exhaust fans in separate dwelling units should not share a common exhaust
Exhaust has been properly installed, sealed, and terminates to outdoors
Fan CFM rating is higher than the requirement increasing the likelihood that it will meet the performance level once installed
Fan CFM rating is higher than the requirement increasing the likelihood that it will meet the performance level once installed
Fan shares exhaust and does not have dack-draft damper installed
Fan shares exhaust and has a back-draft damper installed
Fans from seperate dwellings exhausted together without back-draft dampers and not sealed
Furnaces, boilers, and water heaters located within the home’s pressure boundary are mechanically drafted or direct-vented
High-Efficiency Gas Furnace
If fans share common exhaust duct, back-draft dampers installed
Kitchens should be equipped with an exhaust fan that vents directly outdoors
Manufacturer’s label found on this exhaust fan housing shows a sone rating of 2.5
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
Open sump pump
Packing tape has been removed and damper will be able to function properly once fan is installed
Power vented water heater installed
Properly sealed sump pump
Recirculating fan installed that does not exhaust to outside
Right – The sump pump has a sealed cover that is mechanically attached
Right – The sump pump has a sealed cover that is mechanically attached
Separate exhaust fans can share a common exhaust if each exhaust fan is equipped with a back-draft damper to prevent cross contamination
Seperate dwellings with their own seperate exhaust terminations
Sump pump covers mechanically attached with full gasket seal or equivalent
Sump pump functions
The back-draft damper on this exhaust fan is closed to prevent cross contamination
The back-draft damper on this exhaust fan is open when the exhaust fan is operating
The back-draft damper open when the fan is actively exhausting and closes when the fan is off
The ENERGY STAR logo on the manufacturer’s label indicates this is an ENERGY STAR qualifying exhaust fan
The home’s ground source heat pump preheats water for the air source heat pump water heater.
The manufacturer’s label found on this exhaust fan housing shows a sone rating of 1.0
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
This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home
Two exhaust terminations, joined in a roughly cut, restrictive hole and not air sealed
Wrong – The sump pump does not have a cover
Wrong – The sump pump does not have a cover