depemds on inside dia of chimney,,and how much has built up!!!!it was more like a throbbing. We used to burn ties in a "relatively" safe system, and once a week I would burn the flue intentionally. It gets into a oscillation. The air going up the stack is depleted, and when more arrives is flashes into a small explosion blowing burning embers out the top, and filling the firebox on stove with flame. Fun stuff.
smoke detector is obtained, battery installed, and screwed to wall. Cat might jump outta his skin if the thing goes off.