Multiple SmokeStoppers being used to control the interior discharge opening on a fully developed fire or even on a wind-impacted fire. Hot smoke and fire gases are flowing into the egress route with velocity. Installing the first SmokeStopper into the lower portion of the opening and if possible, sliding it upward into position may prove easier and help to protect the fire fighters. If necessary, a second SmokeStopper can be installed to further reduce the size of the opening with a correspondin