GermGuardian AC4825E
AHAM verified
- Really cleans
- 150 sq ft14 m² 14 m²150 sq ft
- Box says
- 743 sq ft69 m² 4.9× overstated
- New filter
- 6–8 months
Levoit · Core 300
Levoit Core 300
Really cleansAHAM verified
217 sq ft20 m² 20 m²217 sq ft
At 4.8 air changes an hour with a 2.5 m ceiling
- Box says
- Changes the air in a 1066 ft2 room once per hourChanges the air in a 1066 ft2 room once per hour (99 m²) 4.9× overstated
- New filter
- Every 6–8 months
See it on Amazon: Levoit Core 300Paid link
The best-known small purifier, with a verified CADR. Cleans a large bedroom or a small living room. No sensor, no app.
Verdict
Who it's for
A plain, proven bedroom purifier: three speeds, a sleep mode and a filter that's easy to find in several versions. AHAM has verified its CADR. If you want auto mode or an app, the Levoit Vital 100S-P has the same CADR and both.
Good
- CADR verified by AHAM
- Filter easy to find, in several versions
- No ionizer
- Small footprint
Trade-offs
- No air quality sensor or auto mode
- No app
- Shorter filter life than most on our list
Spec facts
Levoit Core 300 · Core 300
- Really cleans
- 217 sq ft · 20 m²20 m² · 217 sq ftat 4.8 air changes an hour, 2.5 m ceiling
- Box claim
- Changes the air in a 1066 ft2 room once per hourChanges the air in a 1066 ft2 room once per hour (99 m²)4.9× overstated
- Maker’s claim: Levoit · checked 1 Nov 2026
- Filter
- Levoit Core 300 Series Original Filter3-stage: pre-filter, HEPA-grade filter, activated carbon. Replace every 6–8 months
- Maker’s claim: Levoit · checked 1 Nov 2026
Certified: measured in an independent lab for AHAM’s Verifide programme. Maker’s claim: the manufacturer’s own figure, not independently checked. Where figures come from
Running it
Filter and upkeep
- Replacement filter
- Levoit Core 300 Series Original Filter
- Type
- 3-stage: pre-filter, HEPA-grade filter, activated carbon
- Replace every
- 6–8 months
- Power at top speed
- 56 W
A new filter every 6–8 months means 1.5–2 filters a year. At top speed it draws 56 W: 1.3 kWh if it ran flat out all day. Slower settings use less.
Levoit Core 300 Series Original Filter on Amazon: Levoit Core 300 Series Original Filter Paid link
Source: Maker’s claim, Levoit, checked 1 Nov 2026
The box vs the maths
The box says 1,066 sq ft99 m². It really cleans 217 sq ft20 m².
To clean 1,066 sq ft99 m² it would only change the air in the room 1 time an hour. We size every purifier at 4.8 air changes an hour, the level AHAM's room-size guideline works out to.
Levoit's figure is the room it can change the air of once an hour, and the wording says as much. That's a real number, but at one air change an hour smoke and pollen come back in nearly as fast as the purifier removes them.
243 m³/h smoke CADR ÷ (4.8 × 2.5 m ceiling) = 20.2 m² = 217.9 sq ft20.2 m²
Use the calculator for your exact room and ceiling, or read how we pick.
Drawn to scale: the box says “Changes the air in a 1066 ft2 room once per hour”, the purifier really cleans 217 sq ft, 4.9 times less.Drawn to scale: the box says “Changes the air in a 1066 ft2 room once per hour”, the purifier really cleans 20 m², 4.9 times less.
Room sizes
Which rooms it fits
It suits 107 sq ft10 m² and 161 sq ft15 m² rooms best: there it has 33–100% more air than the room needs, so it needn't run flat out. At 215 sq ft20 m² it only just keeps up (no air to spare), so it would run near its top speed, usually its loudest (why we don’t list noise).
Under a 2.7 m ceiling it covers 201 sq ft, under 3 m 181 sq ftUnder a 2.7 m ceiling it covers 18 m², under 3 m 16 m², so with a 3 m ceiling it no longer covers 215 sq ft20 m² (why).
For a 269 sq ft room or bigger it's too small, although the box claims 1,066 sq ft: the For a 25 m² room or bigger it's too small, although the box claims 99 m²: the 269 sq ft25 m² page lists models that cover it.
Room pages it qualifies for
Alternatives
The Levoit Core 300 or one of these?
The certified models closest in size, and what is different about each, from the same kinds of source.
Cleans 150 sq ft, 67 sq ft lessCleans 14 m², 6 m² less. Same sensor, ionizer and filter interval. 19.9 cm taller.
Levoit Vital 100S-P
AHAM verified
- Really cleans
- 217 sq ft20 m² 20 m²217 sq ft
- Box says
- 1,066 sq ft99 m² 4.9× overstated
- New filter
- 6–12 months
Cleans the same 217 sq ftCleans the same 20 m². It has a PM2.5 sensor with auto mode. It goes longer between filters (every 6–12 months) and draws 35 W at top speed. 4.6 cm taller.
Blueair Blue Pure 511i Max
AHAM verified
- Really cleans
- 233 sq ft21 m² 21 m²233 sq ft
- Box says
- 1,138 sq ft106 m² 4.9× overstated
- New filter
- 9 months
Cleans 233 sq ft, 16 sq ft moreCleans 21 m², 1 m² more. It has a PM2.5 sensor with auto mode. It goes longer between filters (every 9 months) and draws 17 W at top speed. 1.7 kg lighter.
Sources
Where these numbers come from
- Certified AHAM Verifide directory: Levoit Core 300, Core 300-RAC · AHAM Verifide
- Maker’s claim Levoit Core 300-P product page and specifications · Levoit
- Maker’s claim Levoit Core 300 Series Original Filter · Levoit
We don't test purifiers ourselves: every figure on this page is copied from these sources and was last checked on 1 Nov 2026. Spotted one that's wrong or out of date? Tell us and we'll fix it and change the date.