Hinged louvers for maintenance

With the following pictures of 2 ft x 2 ft recessed fluorescent corridor lighting, I meant to show how the louvers of fluorescent light fixtures are provided with hinge for ease of maintenance.
= = = = = RELATED ARTICLES: Lighting installation design= = = = =
Picture 1: 2 ft x 2 ft fluorescent corridor lighting

All parts of an electrical installation must be designed with enough provisions for