Abstract: A closure is provided for temporarily sealing a roof vent. The closure has a resilient core receivable within the opening of the vent, the core pressing against the sides of the vent to hold the closure in place. A mounting plate carries the core, and the mounting plate limits the entry of the core into the vent. The mounting plate also includes a handle for manipulation of the closure. The mounting plate is formed of somewhat stiff material. A center section receives the core, and opposed end sections have cutouts shaped to match the core, the end sections being folded over to hold the core in place. Staples or other fastening devices hold the end sections against the center section.