The DNR considers the following items exempt from MSEI reporting at this time:

1. Any pollutant with potential emissions less than 0.01 tons per year;
2. If all pollutants for an emission unit have potential emissions less than 0.01 tons per year, then the unit can be excluded from the inventory;
3. Fuel-burning equipment for indirect heating and reheating furnaces using natural or liquefied petroleum gas with a capacity of less than 10 Million Btu per hour input per combustion unit;
4. Fuel-burning equipment for indirect heating with a capacity less than 1 million Btu per hour input per combustion unit when burning coal, untreated wood, or fuel oil;
5. Direct-fired equipment burning natural gas, propane, or liquefied propane with a capacity of less than 10 million Btu per hour input, and direct-fired equipment burning fuel oil with a capacity of less than 1 million Btu per hour input, with emissions that are attributable only to the products of combustion;
6. An internal combustion engine with a brake horsepower rating of less than 400;
7. Any generator that is operated less than 2 hours per week;
8. Storage tanks with a capacity of less than 19,812 gallons and an annual throughput less than 200,000 gallons;
9. Any container, storage tank, or vessel that contains a fluid having a maximum true vapor pressure of less than 0.75 psia;
10. Nonproduction maintenance activities, which may include brazing, soldering, or welding equipment, and surface coating operations using only hand-held aerosol spray cans;
11. Manually operated equipment (see definition in Appendix A) used for buffing, polishing, carving, cutting, drilling, machining, routing, sanding, sawing, scarfing, surface grinding, or turning;
12. Indoor-vented powder coating operations with filters or powder recovery systems;
13. Parking lots and employee roads used to get to and from work. However, unpaved and paved roads used to haul material and/or product on a regular basis must be included.

NOTE: Indoor-vented sources MUST be included in the inventory if they do not qualify for any other exemption.