Designed for smaller HVAC systems, we optimized size and performance by augmenting a single deep-bed activated carbon module with PCO-formulation coated air vanes to allow the greatest PCO surface area possible. For the ultimate in convenience, reliability and warranty we added our unique UVC-Advantage one-piece UV lamp module that provides fresh electronics with a fresh 2-year warranty. Your Advantage PowerPCO air purifier will always be under warranty when lamp module changes are made at the end of the lamp's useful life (2 years).