It is three screws and two electrical connections.. EASY
upflow, lowboy, downflow, or counterflow, horizontal, and multiposition
The upstream Oxygen Sensor is before the Catalytic Conver in the exhaust pipe.
Not always true. There are upflow units, downflow units and horizontal side discharge units.
More than likely the air handler or furnace is upflow. In other words air is drawn through the bottom of the unit(the return) which is unconditioned air and blown out through the top of the unit(the supply), which is conditioned air.
That would depend on whether you have an upflow unit (yes) or a down flow unit (no), there are also horizontal left & right units. Flow is indicated by the the direction that the air travels into and out of the furnace or air handler.
It depends on the duct system. Each furnace has a recommended outlet temperature. To get the proper airflow for that temperature the duct system has to be properly designed. If properly designed the speed would typically be low.
C30A is the series of the evap coil. The nominal BTU rating (cooling) for this coil would be 48,000 BTUH (signified by the -047). The "U" indicates upflow, although it can be used in downflow orientation, as well. The "B" would be the case size - 17 1/2" wide.
The SEER rating of a unit is the cooling output in Btu (British thermal unit) during a typical cooling-season divided by the total electric energy input in watt-hours during the same period. The number is for a Rheem RGPN07 CLASSIC SERIES® SUPER QUIET 80 80% A.F.U.E. UPFLOW/HORIZONTAL GAS FURNACE
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern --FLOW. That is, six letter words with 3rd letter F and 4th letter L and 5th letter O and 6th letter W. In alphabetical order, they are: inflow onflow reflow upflow
Low Head dams often have tops that are below the water surface. But aside from their lack of visibility, they can create a fatal trap for small boats. Water going over a low-head dam creates a strong recirculating current (a backroller) and a turbulent upflow (a boil). These currents can push boats back against the downstream side of the dam, where the boats may capsize and their occupants may be pulled under.
Ceiling fans usually can rotate in either direction. There is usually a switch on the unit. This allows downflow during the warm season and upflow during the winter. The direction of rotation of a table fan is determined by the shape of the blades. A motor can be made to run in either direction but to force air to the front of the table fan, it must rotate in the direction that the blades will force the air properly.
I'm assuming that by "down draft furnace" you mean a counterflow or downflow furnace. This furnace takes its "cold air return" at the top, and blows the warm air out the bottom (typically, into ductwork that runs under the floor).Older downflow furnaces were dedicated to that configuration, and could not be mounted in other positions.Nowadays, most furnace manufacturers make "multi-poise" furnaces. They can be mounted in downflow, upflow, or side-flow positions, when they are installed according to the manufacturer's certified instructions.The HVAC Veteran