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residential

Across
This air naturally rises
This is total pressure minus velocity pressure
This furnace is considered 100% efficient
This pressure can draw flue gasses into the supply line
This is the transfer of heat through an object
A unit of heat
This is the pressure of 14.7 psi
This should always be done to the air entering a air handling unit
This is how a furnace should be sized
Down
This is used on return lines and has no directional capabilities
This is the transfer of heat through heat waves
This air is 70 deg, at sea level and 50% humid
This air is more dense and requires more airflow
This device controls air flow
This is a reference tool for different fittings
This furnace fits well in attics or low crawlspaces
This is the transfer of heat through a flowing media
This furnace has the blower below the heat exchanger
These are usually used in ceiling supply lines
This furnace has the blower and heat exchanger side by side with both air streams travelling through the top