Battic Door Whole House Attic Ceiling Fan Shutter Seal, Fits up to 48" X 48" Attic Fan Shutters. (We also offer a 3x4' kit) 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 TO FIT. Cover and seal the attic fan from the house side in minutes, no tools are needed!