The genuine part, and a clear line on which machine the listing actually names.
Core 300-RF is the code on the cartridge, and it is the only reliable way to shop for this part. The machine on your desk may say Core 300, Core 300S, or Core 300-P on the front, and those names have been applied across more than one generation.
The listing here is the genuine Levoit part, and the machine it names is the one that appears on this page. The claim comes from the listing itself, not from the family name on the front of the machine.
Nothing on this page extends a compatibility list by inference. Where the genuine listing names one machine, one machine appears. A cartridge that fits a 300-P is not automatically right for a 400S-P because the numbers look related.
Links to Amazon on this page are affiliate links. If you buy through one, this site may earn a commission at no additional cost to you. Nothing on the page was tested here and no product placement was paid for.
Genuine
Sold by the company that built the machine. The compatibility statement comes from the party who designed the airflow path.
Code on the cartridge
Levoit Core 300-RF Filter
Core 300-RF is the code printed on the cartridge you are pulling out, and this is the genuine Levoit part carrying it. The listing states it is for the Core 300-P, that it is AHAM Verifide, and that it includes activated carbon. Matching the code beats matching the description of the machine, because Levoit ships several Core models with cartridges that look alike.
What the listing supports, and what it does not
The code on the listing matches the code molded into the cartridge, which is the whole test
Stated as a genuine Levoit filter rather than a compatible one
The listing states AHAM Verifide status
Activated carbon is stated as part of the assembly
The listing names the Core 300-P specifically, so other Core numbers need their own check
Single cartridge, so there is no spare waiting when the indicator comes on
Genuine parts usually cost more than the compatible listings on the same page
Best forA Core 300-P where you would rather not think about whether a filter fits.
Fit is asserted by the seller, not by the appliance manufacturer. Read the named model list against the label on your own machine.
This catalog stocks no third-party listing for Core 300-RF. That is a statement about what is here, not a statement that none exists — and it is not a reason to reach for a cartridge named for a different code.
The machines these listings name
1 entry sits below, drawn from 1 genuine and 0 third-party listings for Core 300-RF. Each one is here because a listing names it, and no numbering pattern has been read as a compatibility claim.
Levoit Core 300-P (stated by the genuine listing)
How to check your own
Open the filter door and take the old cartridge out — the code is printed or molded on the plastic rim.
Read the code off the cartridge itself rather than the model name on the front of the machine.
Check the sticker inside the filter compartment, where most machines repeat the part number.
Match that code against the listing, and read which machines the listing names before ordering.
When it gets changed
Levoit states a replacement interval for the Core 300 series, and the machine tracks running hours and signals when it thinks the cartridge is due. Rooms with pets, smoke, or nearby construction load a cartridge faster than the stated interval assumes.
To repeat what is said at the top of the page: the Amazon links here are affiliate links and may earn this site a commission. Ordering, badges, and every claim on the page were decided from what the listings state, not from any commercial arrangement.
