When using the HVAC system during construction, LEED NC V2.2 EQ Credit 3.1 states that a MERV-8 filter should be provided at each return air grille. On this project we anticipate using the building\'s permanent air distribution system during construction in order to temper the indoor air as required to allow for proper installation of finish materials. To ensure the proper installation and protection of ceiling materials, the ceiling tiles/return air grilles will not be installed until just prior to substantial completion. We plan to protect the system by providing MERV-8 filters at all permanent filter locations in the equipment, supply ductwork, and return ductwork, as well as at the return duct riser openings, until the ceiling tiles are dropped. We believe our proposed plan complies with this credit as shown below. System Description: The mechanical system on this project consists of a ducted supply network and a plenum return system. The system utilizes rooftop air handlers with vertical return duct risers that pull return air from the ceiling plenum through openings in the return duct risers on each floor. The following measures will be taken to protect the mechanical equipment and air distribution system when used during construction in compliance with EQ Credit 3.1: 1. The air distribution system will only be run when interior temperatures are out of required range to properly install finish materials. When the outdoor temperature is adequate, we will not run the air distribution system and will open the building\'s operable windows to allow for proper air ventilation during construction. All punched window openings in the building have operable glazing. 2. MERV 8 filters will be placed at all permanent filter locations in the equipment, supply ductwork, and return ductwork. These filters will be in place and maintained at all times the system is running during construction in accordance with EQ Credit 3.1. 3. MERV 8 filters will also be placed over the return duct riser openings to protect the return duct system from airborne dust. These return riser temporary filters will remain in place prior to installation of ceiling tiles and return grilles as well as after tile/grille installation. This is done to ensure compliance with EQ Credit 3.1. 4. To ensure minimal damage to finish goods, installation of ceiling tiles and return grilles will be one of the last activities completed prior to substantial completion of the building. Ceiling tiles and return grilles will not be put in place until the building has received a thorough cleaning. Once all ceiling tiles and return grilles have been dropped, the return plenum will be protected in the following manner: If during this finished state of construction airborne construction dust is being produced in the building, then the plenum return will be protected by either: a. Shutting the return down and either run the system on outside air or fresh air via operable windows or, b. Installing MERV 8 filters on the return grilles to protect the plenum. At completion of construction and prior to occupancy, temporary filtration media in all equipment will be removed and replaced with permanent MERV-13 filters in order to comply with EQ Credit 5. Please confirm if the proposed compliance path meets the credit intent. If it is not acceptable, please clarify what changes are required in order to meet the credit requirements.