Configuration of a surface cleaning apparatus

1. A hand vacuum cleaner having a front end and a rear end, the hand vacuum cleaner comprising:

(a) an air flow passage extending from a dirty air inlet to a clean air outlet, the dirty air inlet removably connected in air flow communication with a surface cleaning head;

(b) a vacuum cleaner housing comprising a suction motor positioned in the air flow passage, a front end, a rear end and a handle, the suction motor having a suction motor inlet end that faces the front end of the vacuum cleaner housing and a motor axis;

(c) a cyclone unit positioned in the air flow passage upstream from the suction motor and comprising an openable front door provided at the front end of the hand vacuum cleaner and a cyclone comprising a cyclone air inlet, a cyclone air outlet and a cyclone axis, wherein the cyclone unit also comprises a cyclone unit wall which is moveable with respect to the vacuum cleaner housing and the openable front door is pivotally mounted to the cyclone unit wall whereby the openable front door remains attached to the cyclone unit wall while the cyclone unit is emptied;

(d) a lower surface having a discontinuity;

(e) a first support member provided on the lower surface of the hand vacuum cleaner at a first location that is forward of the discontinuity, wherein the first support member extends away from the lower surface of the hand vacuum cleaner;

(f) a second support member provided on the lower surface of the hand vacuum cleaner at a second location, wherein:

a. the second support member extends away from the lower surface of the hand vacuum cleaner;

b. the second location is axially spaced rearwardly from the first location and is rearward of the discontinuity; and,

c. the second location is closer to the motor axis than the first location whereby the second support member is longer than the first support member; and,

(g) a post motor filter having an outer perimeter defining a volume and the cyclone axis and the motor axis each extends through the volume,

wherein, when the hand vacuum cleaner is positioned on a horizontal surface, the hand vacuum cleaner is self-supporting with the cyclone axis extending horizontally and the vacuum cleaner housing and the cyclone unit positioned above the horizontal surface, and

wherein the dirty air inlet remains in position when the openable front door is opened.

2. The hand vacuum cleaner of claim 1 , wherein the first support member is located below the cyclone unit and the second support member is located below the vacuum cleaner housing when the hand vacuum cleaner is positioned on the horizontal surface with the first and second support members at a lower side of the hand vacuum cleaner housing.

3. The hand vacuum cleaner of claim 1 , wherein the first support member is located below the cyclone unit and the second support member is located below the suction motor when the hand vacuum cleaner is positioned on the horizontal surface with the first and second support members at a lower side of the hand vacuum cleaner.

4. The hand vacuum cleaner of claim 1 , wherein the cyclone unit and the vacuum cleaner housing comprise a hand vacuum cleaner portion and the first support member is located closer to the openable front door than the second support member.

5. The hand vacuum cleaner of claim 4 , further comprising a pre-motor filter wherein the first location is forward of the pre-motor filter.

6. The hand vacuum cleaner of claim 5 , further comprising a post-motor filter housing, the post-motor filter housing is removably mounted to a portion of the vacuum cleaner housing and the second location is forward of the post-motor filter.

7. The hand vacuum cleaner of claim 1 , wherein the motor axis and the cyclone axis are co-axial.

8. The hand vacuum cleaner of claim 1 , wherein the front door has a diameter, the cyclone unit comprises a first cyclonic stage and a rear end of the first cyclonic stage has a diameter that is generally equal to the diameter of the front door.

9. The hand vacuum cleaner of claim 1 , wherein the cyclone unit comprises a first cyclonic stage and a second cyclonic stage, the second cyclonic stage comprising a plurality of second stage cyclones in parallel that are positioned downstream of the first cyclonic stage and forward of the suction motor, each of the second stage cyclones having a second stage cyclone air outlet wherein the first location is forward of the second stage cyclone air outlets.