They're The Law. Every year, many children fall out of windows in New York City. Others are badly hurt. It can happen fast, to any child, even yours. Window guards can keep children from falling out of windows.
Screens are only for keeping bugs out.
They will not protect your children. Only window guards will keep kids safely inside. All window guards must be the strong metal kind approved by the Health Department. And every window guard must be installed right and put in tight with screws. Make sure that your window guards are put in right, and put in tight.