Eureka Forbes Aeroguard 355: High-Efficiency 220 CADR HEPA + Activated Carbon for 250 Sq.Ft.

The Aeroguard 355 employs a linear airflow path driven by its front inlet configuration, designed to maximize the contact time between ambient air and its 4-stage filtration stack. With a rated CADR of 220 m³/hr, the internal motor-fan assembly is tuned to cycle air in a 250 sq.ft. space approximately five times per hour. The absence of an automated PM2.5 sensor necessitates a manual operational logic where the user selects fan speeds to manage the 32-48 dB acoustic profile based on the localized dust load. From a fluid dynamics perspective, the 99% efficiency of the HEPA filter at 0.3 microns creates a significant static pressure drop, which the Aeroguard 355 overcomes through a high-torque motor optimized for consistent 220 m³/hr output. The 4-stage sequence—comprising Pre-filter, HEPA, Activated Carbon, and Anti-bacterial—ensures that larger debris are sequestered before reaching the high-density HEPA media, preserving the 99% filtration efficacy over longer maintenance intervals. The Activated Carbon layer is specifically calibrated for VOC adsorption within the 4-stage stack to treat 250 sq.ft. environments, while the Anti-bacterial filter provides a final safeguard against microbial growth. Without app-based modulation or real-time AQI feedback, the 220 CADR remains a fixed performance metric that requires manual intervention to adjust between its 32 dB low-power state and its 48 dB maximum performance ceiling. This 4-stage system is technically robust for 250 sq.ft. areas where manual control is preferred over sensor-driven automation.