For horizontal air conditioner units (air flows horizontally through the.

Which way to install furnace filter. If the old filter has already. The heating duct will begin near or at the top of the. This will help you remember the most important part of how to install a furnace filter in the future.

Look for the appropriate markings that tell you which side of the filter should be facing the furnace. Remove the old, dirty filter. The easiest way in determining which way the furnace filter direction is to refer to the old filter before removing it and installing the new one in the same way.

What do furnace filter ratings mean? Exact filter locations vary by unit, but you can use the following as a general guide for locating your filter:. Stand in front of the furnace and look for the ducts.

It’s time for you to install the new filter. All filters are rated using the minimum efficiency reporting. Here’s an easy way to figure out which way the air flow arrow goes:

The arrow should always point towards the return. Determine where on the furnace you can find the filter air box. Pull the old filter out.

Which direction should my furnace filter face? Check out our handy guide to installing a furnace filter. Furnace filter direction.which way does it go?