Immunity from prosecution may be granted at the grand jury stage, CPL 190.45, as well as elsewhere in a criminal proceeding, typically at trial. Immunity is covered by article 50 of the Criminal Procedure Law and in article 190, regarding grand jury proceedings.
A louver (American English) or louvre (British English) is a window blind or shutter with horizontal slats that are angled to admit light and air, but to keep out rain and direct sunshine. The angle of the slats may be adjustable, usually in blinds and windows, or fixed.
90 Degree Louver. This is a movable blade louver, adjustable from closed to 90 degrees open. It is used to control the flow of air in or out of a building by varying how far the slats or opened. When the slats are in the 90-degree position the resistance to air flow is at a minimum offering maximum airflow.