→ 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! → 1/4 foam core (white one side / foil other side) → includes 16ft of Hook and Loop Tape (VelkroTape)