The project to which this CIR pertains is a vocational school for high school-aged students. Within this building there are science labs. The two science laboratory classrooms share one preparation room. Each of the three spaces is served by a dedicated heat pump. Each space is also exhausted, per the requirements of the Ohio School Facilities Commission\'s 2008 Ohio School Design Manual. We are writing this CIR to confirm that our design approach meets the intent of Indoor Environmental Quality Credit 5, Indoor Pollutant and Chemical Source Control. In the heat pump systems, as designed, each room has it\'s own dedicated heat pump. This unit takes air from the dedicated space only, mixes it with fresh air from a dedicated outside air unit, heats or cools it accordingly and supplies it back to the space. In keeping with the EQc5 requirements, each of these units is to be provided with MERV 13 filtration that will handle both the air from the space and the fresh air. No air is sent to another space, nor is any air brought to the science labs from another space by the HVAC system. The supply and exhaust air rates have been balanced to maintain the proper negative pressurization of each space as per EQc5. The preparation room will be negative relative to the adjacent corridor and two science labs. The exhaust systems are ducted directly to the outside through the building roof. Architecturally, each room will feature deck-to-deck partitions and self-closing doors, as required. The Credit Requirements state that no air must be recirculated. We believe the intent of this statement is to prohibit recirculating air between rooms, which we have eliminated with our design. The Heat Pump only uses air from the room it serves and fresh air provided via direct ducting. No air from this space will travel to another space within the building. In addition, the supply air volume, by design, shall remain less than the exhaust air volume to maintain the required negative pressurization. Further more, we consider the air in a K-12 classroom laboratory to be Class 2 air per ASHRAE 62.1-2004. According to Section 5.17.3.2 Class 2 Air: "may be recirculated within the space of origin." Therefore, we believe the HVAC system as described above meets the intent and requirements of LEED for Schools EQc5. We also believe the same to be true for fan-powered VAV boxes, classroom unit ventilators and in-room fan coil units.