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the arrow points in the direction of air flow.
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UP- flow, down-flow and Horizontal
At the bottem right hand side facing the furnace you will find a filter. This is one of the commen filters you can buy at Walmarts. The filter is a cardbord sheet with a filter on it. Pull out said filter look at the size printed on it.Go to Walmart and buy another. When you push in said filter be sure the air flow arrow on top edge is pointing toward the furnace.
Toward the direction of the air flow. In other words the air is being drawn into the furnace so the arrow should point at the furnace.
The same reason you replace the filter in your home furnace. They can become clogged with lint, dirt and reduce the air flow.
Arrow on filter toward furnace or inline with air flow.
The four types of air flow patterns are up flow, down flow, low boy, and horizontal
Not unless your unit has air flow drop sensors that could damage the pumps. If you installed a new filter and the furnace then quit maybe you didn't properly replace the door. There may be a switch attached to the door or filter. Look fer it!
Air flow may be restricted by a dirty filter or air registers blocked.
The same reason you replace the filter in your home furnace. They can become clogged with lint, dirt and reduce the air flow.