Counterflow horizontal furnaces can be mounted horizontally where height restrictions are paramount.
Horizontal gas furnace in attic.
Horizontal installation is also available for some furnace and air handler models.
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Upflow horizontal and downflow horizontal models are also available.
Most furnaces draw cold air in at the bottom and warm air is released out the top.
Horizontal units can be installed in attics garages or basements either by placing the device on a platform or suspending it from the ceiling.
In certain situations this is not practical and a counterflow or downflow furnace is needed.
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For instance in a basement crawl space or attic.
These offer two possible configurations.
The horizontal furnace installation in an attic should be on a service platform large enough to allow for proper clearances on all sides and service access to the front of the furnace see figure 5 clearance table.
If you want to purchase a mid efficiency furnace for your home then the price profile for the equipment is similar with a downflow model compared to an upflow one.