IQAir whole-house air purification systems utilize the ductwork of your existing HVAC system to transform your home into a virtually allergen-free zone by removing bacteria, pet allergens, mold spores, dust, pollen and other contaminants from indoor air and distributing purified air to every room in your house. The Perfect 16 2225 is for 3-ton HVAC systems and the Perfect 16 2530 is for 5-ton HVAC systems.