**EDB - MAINTENANCE AND CONTROL OF MATERIALS AND EQUIPMENT** **Last Updated Date:** 02/25/2014 **Adoption Date:** 01/10/2006 ### Maintenance of Univent Filters One of the most important factors in a good energy conservation program is maintaining the filters, either disposable or permanent, in all school univents. It also improves the air quality of that particular building. This is important as air quality in schools is becoming more and more of a problem. Therefore, the following is a policy covering the changing and the cleaning of these devices.  The regular disposable filters will not be cleaned or vacuumed, only replaced. The policy is as follows: Filters will be cleaned or replaced every three months as follows: 1. During summer vacation covering September through November; 2.   At the end of November covering December through mid-March; 3.   Mid-March—part of March through June. Custodians at those schools using disposable filters, will in May of each year anticipate their needs for the following school year.