The Perfect 16 is an energy-efficient marvel. It outperforms other air purifiers, while using no additional electricity. The Perfect 16 has one of the lowest air restriction levels in the industry, so it keeps your home's HVAC system running smoothly and efficiently without forcing it to push air harder. In fact, the Perfect 16 actually improves the performance of a heating and cooling system when compared to conventional air cleaners. As a result, the Perfect 16 can lower energy bills while attaining a MERV 16 rating, the highest filtration rating possible.