In order to comply with LEED IEQc5, do we need to provide MERV-13 filters for the supply air of a very large warehouse? The warehouse is expected to be “regularly” occupied. Currently the warehouse has roof mounted exhaust fans to reduce summer time over-heating, with louvers providing make-up air. There is no heating, cooling or air handling equipment needed, the building is naturally ventilated year-round with the exception of the exhaust air fans. It would not be practical to install MERV-13 filters behind the louvers, as the resistance to air flow is too great. The only option would be to install supply fans with filters and this would greatly increase the energy consumption of the building, as the airflow is huge. I'd appreciate your thoughts. Thanks. David