### Full 5-stage Gradient Composite Filtration Hierarchy Design From back to front: activated carbon layer + G4 pre-filter + F9 medium filter + dual H13 HEPA layers for step-by-step graded impurity interception. ### High Adsorption Open-cell Activated Carbon For VOC & Peculiar Smell Removal Porous carbon sponge efficiently adsorb formaldehyde, hydrocarbon and other peculiar odor gas generated during filament melting. ### Dual-layer H13 HEPA Reaches 99.97% Interception Efficiency Against PM0.3 Fine Particles Double stacked high-grade HEPA sheet trap ultra-fine smoke dust down to 0.3 micron to keep internal enclosure air clean. ### Standard 80×80×95mm Dimension Fully Matches A1 Mini Filter Cabin Cavity Fixed outer size consistent with original reserved space for seamless plug-in without enclosure trimming. ### Surrounding Cushion Foam Realizes Tight Sealed Install To Prevent Air Bypass Leakage Perimeter wrapped elastic foam gasket eliminates clearance gap to avoid unfiltered air bypassing the filter cartridge. ### Direct Drop-in Swap To Restore Enclosure Purification Performance After Original Filter Saturation Plug and play replacement for clogged saturated stock filter to recover full smoke and deodorizing capability.