Battic Door Whole House Attic Ceiling Fan Shutter Seal Cover, Fits up to 36" X 48" Attic Fan Shutters Ceiling Shutter Seal Cover provides an air seal reducing any air leakage. Works like a storm window for your whole house fan! Reduce drafts, improve comfort, and save energy costs all year-'round! Attic access is not required! Installs easily - TRIM IT TO FIT. Cover and seal the attic fan from the house side in minutes, no tools are needed!