Check that the shaft AOV opens only on that floor and the damper at the top of the shaft (likewise the base of the shaft if provided);
Without resetting the system proceed to another floor and repeat the test, nothing should happen i.e. no other AOV should open;
Repeat as you feel necessary, to ensure have a good sample;
Without resetting the system, find a manual override switch for another floor AOV (associated with the same shaft) and activate it, again nothing should happen;
Have the system reset, any AOVs that opened should now close;
Finally check all AOVs are close fitting and if they are fire door type, check the adequacy of the intumescent strips and smoke seals.
