A surface cleaning apparatus comprises an air flow passage extending from a dirty air inlet to a clean air outlet. A suction motor positioned in the air flow passage. A cyclone is removably mounted to the surface cleaning apparatus and positioned in the air flow path. The cyclone has a cyclone air inlet and a cyclone air outlet. The cyclone is mountable to the surface cleaning apparatus in a mounting direction. An air inlet seal is positioned in a first plane and seals the cyclone air inlet to the airflow passage. An air outlet seal is positioned in a second, non-orthogonal plane and seals the cyclone air outlet to the airflow passage. The air inlet seal and the air outlet seal are concurrently sealed by movement of the cyclone in the mounting direction.