PetSafe Cat Veranda Cat veranda for window installation; protects indoor cats as they rest on windowsills Allows cats up to 20 pounds to enjoy fresh air while staying safe and dry Secure design locks the veranda in place; metal construction with rust resistant coating Easily installs into vertically opening, single and double-hung windows from 24-1/2 to 34 inches wide Lockable entry flap; weather tight for protection from the elements