Where is the filter slot on this unit

This air handler model does not feature an internal, built-in filter slot on the cabinet itself. Instead, the air filter is meant to be installed externally in a remote location within your ductwork, typically inside a return air filter grille on your wall or ceiling, or in an external filter rack installed at the return air inlet of the unit.

If you have any further questions, please call us and we will be happy to assist you.