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Naturally ventilated buildings may not be completely compatible with conventional mechanical systems. Care shall be exercised so that neither cooling strategy undermines the effectiveness of the other. Automatic sensors to detect open windows or doors and to shut down mechanically-conditioned air supply are recommended in naturally ventilated buildings with backup air conditioning or closed-loop ventilating systems. Natural ventilation of buildings with large openings in the building envelope is inappropriate during months when appreciable heating or air conditioning is required unless the openings can be closed to thermal and infiltrative losses.

Window placement, size, type, and position will influence ventilation effectiveness. Elevating the building may also be desirable (refer to Section 4). 6 Solar Shading. Shading of the glazing is required at all times of the year when cooling is required (both natural and mechanical) from 8 am to 6 pm solar time (refer to Appendix B). The shading should be exterior to the glazing to provide maximum protection from radiant solar heat gain. External shading of building surfaces, outdoor living areas and parking lots is also recommended.

This creates less resistance to airflow and results in greater interior velocities. )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))- 44 MIL-HDBK-1011/2 Screens should be located in all areas where insects, rodents, or birds could prove to be an annoyance or damage the contents of a room. Unless the specific requirements of the local environment dictate otherwise, 14-wire screen should be used. This allows greater interior airflow than higher density mesh and should prevent most insects from entering the building.

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