FitCheckrReplacement comparison
Core 300-RF vs Core 400S-RF
Levoit Core 300-RF and Core 400S-RF are different filter sizes for different purifier bodies.
Seal fit
Core 300-RF: 8 mo
Core 400S-RF: 12 mo
Official product image references
Use the manufacturer reference images to identify the two parts before comparing model support and usage.
Which replacement should you use?
Risk summary
Levoit Core series names look similar, but the model number controls physical filter size and seal.
Main difference between Core 300-RF and Core 400S-RF
Which one fits which models
Use Core 300-RF for the model family described on its replacement page. Use Core 400S-RFonly when your device model or manual explicitly lists that part number.
Buyer mistake warning
Do not substitute by shape alone. The most important difference to check here is seal fit.
When to choose Core 300-RF
Levoit Core 300 owners replacing the compact cylindrical Core 300 filter.
When to choose Core 400S-RF
Levoit Core 400S owners replacing the larger Core 400S filter.
Frequently asked questions
Are Core 300-RF and Core 400S-RF interchangeable?
Levoit Core 300-RF and Core 400S-RF are different filter sizes for different purifier bodies.
What is the main difference between Core 300-RF and Core 400S-RF?
The main difference to verify is seal fit. Levoit Core series names look similar, but the model number controls physical filter size and seal.
When should I choose Core 300-RF?
Levoit Core 300 owners replacing the compact cylindrical Core 300 filter.
When should I choose Core 400S-RF?
Levoit Core 400S owners replacing the larger Core 400S filter.
Can I rely on part photos alone?
No. Part photos help identify packaging and shape, but compatibility should be confirmed by exact model support, part number, replacement type, and manufacturer references.
Official reference pages
Use these manufacturer pages to inspect current part photos, packaging, and model language. FitCheckr's comparison notes summarize fit risk, but the official pages should be used to confirm current part details before choosing a replacement.
| Fit signal | Core 300-RF | Core 400S-RF |
|---|---|---|
| Brand family | Levoit | Levoit |
| Replacement type | HEPA filter | HEPA filter |
| OEM status | oem | oem |
| Replacement interval | Every 6-8 months depending on usage | Every 6-12 months depending on usage |