Showing results 1 - 32 of 32
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A boiler system can be set up with primary and secondary loops to supply hot water for multiple uses
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A Category I induced draft boiler uses an induced draft fan to pull air through the combustion chamber and to the flue
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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
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A direct-vent sealed-combustion furnace has dedicated pipes for combustion air and exhaust
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A portable CO monitor is used to test for ambient CO near a ventless combustion fireplace
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Basic components of a gas tankless water heater include a high-powered burner, fan, and heat exchanger; condensing gas water heaters also have a secondary heat exchanger and a piped air intake to the sealed combustion chamber
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Because flue temperatures are cool, intake and exhaust ducts on a Category 4 direct-vent sealed-combustion condensing furnace can be made of PVC
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Category III oil-fired, sealed-combustion boiler configured as a direct-vented appliance that draws its combustion air from outside
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Category III oil-fired, sealed-combustion boiler with the burner assembly cover removed
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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
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Furnaces, boilers, and water heaters located within the home’s pressure boundary are mechanically drafted or direct-vented
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In a Category I gas-fired, natural-draft boiler, the natural draft of the heated flue pulls combustion air through the draft hood into the combustion chamber
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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
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Portable gasoline-powered generators like this one can power smaller emergency cooling and refrigeration loads
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Right – This sealed combustion gas furnace has a fresh air intake with an electronically controlled damper.
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The air tightness of the garage-to-house air barrier can be tested with a blower door kit and two manometers
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The natural draft and induced draft furnace are both Category I appliances that receive combustion air from the combustion appliance zone
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The raised hood at the base of the vent stack on this water heater shows that it is an atmospheric vented gas water heater
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Wrong – The gas water heater is left on during enclosure leakage testing, which could result in dangerous backdrafting of the water heater when the home is depressurized