FitCheckr

Replacement comparison

Core 300-RF vs Core 400S-RF

Side-by-side replacement part diagram with circled fit differences and risk notes.12Check fit1 + 2
A: Core 300-RF
B: Core 400S-RF
1/2 difference: Seal fit
Family: Levoit vs Levoit
Timing: 8 mo vs 12 mo

Illustrated fit map, not a product photo. Circled areas mark the fit details buyers should verify before treating these replacements as interchangeable. HEPA filter.

Quick verdict

Levoit Core 300-RF and Core 400S-RF are different filter sizes for different purifier bodies.

Official reference pages

Use these manufacturer pages to inspect current product photos, packaging, and model language. FitCheckr's diagram is an illustration of fit risks, not a copied product image.

Core 300-RF official pageCore 400S-RF official page
Levoit

Levoit Core 300-RF Replacement Filter

Levoit Core 300 owners replacing the compact cylindrical Core 300 filter.

Levoit

Levoit Core 400S-RF Replacement Filter

Levoit Core 400S owners replacing the larger Core 400S filter.

Fit signalCore 300-RFCore 400S-RF
Brand familyLevoitLevoit
Replacement typeHEPA filterHEPA filter
OEM statusoemoem
Replacement intervalEvery 6-8 months depending on usageEvery 6-12 months depending on usage

Risk summary

Levoit Core series names look similar, but the model number controls physical filter size and seal.

Check Core 300-RF modelsCheck Core 400S-RF models