Can someone help with this...

If my home is wood framed with front brick facing, do I've to keep the mortar left out (keep it open) in the side where my brick facing side joins with Vinyl siding to allow any condensation between the exterior sheathing and the brickwork to escape to the outdoors or it can be filled up with the mortar ? Please let me know.

Also please suugest me good Dehumidifier (Make / Model / size) for my basement (600 Sq ft) ?

Thanks for the help in advance.

SM