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What direction does the air flow in a Trane XB80?

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Trane XB80. When replacing filter (in unit- goes toward top of unit), there are instructions to align an arrow printed on the side of the filter with the direction of air flow. Problem is, I don't know what direction the air flows in the furnace. Does the arrow face up or down when installing the filter?

On 2012-11-25 JB wrote:

From looking at the owner's manul it seems you have an up-flow furnace (the filter(s) are beneath the furnace). If so the air goes up through the furnace. However, if for some reason this is a down-flow furnace (filter(s) at the top of the furnace) the air flows down into the furnace.

Take a look at page 7 and 8 of the manual (http://www.trane.com/Residential/Downloads/Manuals/32-5064-WEB01_Indoor_Units.pdf). Page 7 shows the path of airflow for a up-flow furnace and page 8 shows the path for a down-flow.

Here is a how-to on changing the filter for either an up-flow, down-flow, or horizontal furnace: http://www.filtersusa.com/filterchanging.cfm.

Here is one way to figure it out: http://www.ehow.com/how_4798514_air-flow-direction-furnance-filter.html.

Here is a simpler method: http://www.doityourself.com/forum/ducting-air-circulation-ventilation-systems/239534-furnace-air-flow-direction.html

Hope this helps!

To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present.  To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl

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