FreAire KN6391RGB Air Purifier, Up to 1086 ft²

FreAire KN6391RGB is a compact air purifier listing coverage up to 1086 ft², with three-stage filtration, sleep mode and ambient lighting. Its listed dimensions are 6.1 x 6.1 x 9.7 inches, and customer feedback describes quiet operation and suitability for small rooms.

At a glance

The listing claims a three-level filtration system for smoke, pollen, pet dander, odors and particles as small as 0.3 microns.
A dual-channel inlet and 360-degree outlet are paired with a stated room coverage of up to 1086 ft².
Sleep mode lowers the fan to its lowest level. The listing claims noise as low as 20 db.
Three ambient light options and an aroma pad add features beyond air cleaning.

Price

$39.99Save 64%

Reference price: ~~$109.99~~

Price checked: Nov 12, 2026

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Pros and cons

Pros

Small listed dimensions may suit desks, bedrooms or other spaces where a large unit is impractical.
Sleep mode and the listing's low-noise claim fit nighttime use.
The aroma pad allows essential oils to be used alongside purification, though oil is not included.

Technical specifications

10 specifications

Model and finish
Model number	KN-6391
Color	Black

Filtration and coverage
Filtration system	3-level high-efficiency filtration system
Listed particle size	0.3 microns
Listed room coverage	up to 1086 ft²

Operation and features
Sleep-mode noise claim	as low as 20 db
Ambient lighting	3 kinds of lights
Air inlet and outlet	dual-channel air inlet and 360-degree air outlet
Aroma pad use	4-5 drops of your favorite essential oil (not included)

Dimensions and installation
Dimensions listed	6.1 x 6.1 x 9.7 inches; 3.02 pounds

What to know before buying

The listing calls this model KN6391RGB in the title and KN-6391 in product details. Its 1086 ft² coverage and 20 db sleep-mode noise are listing claims, not independently confirmed performance measurements. Add 4-5 drops of essential oil to the aroma pad. Oil is not included.

Who is it for?

A good fit for

Buyers seeking a small-format purifier with a sleep mode for a bedroom or home office.
People who want ambient lighting and an aroma pad as additional features.

Less suited to

Buyers who need verified room-cleaning performance or independently confirmed noise measurements.
Anyone who requires essential oils to be included in the package.

FreAire KN6391RGB Air Purifier, Up to 1086 ft² · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.8 / 5 · 140 ratings

5 stars86%86%
4 stars12%12%
3 stars2%2%
2 stars0%0%
1 star0%0%

Customer feedback highlights perceived effectiveness, quiet operation and suitability for small rooms, with some reporting better sleep and concentration alongside timer use. Those impressions make the listed sleep mode relevant for bedrooms, but they do not verify the claimed 20 db noise level or room coverage. The ratings trend strongly positive, though ratings alone do not explain individual experiences.

Positive themes

Customers describe the purifier as effective and quiet.
Feedback mentions a size suited to small rooms and use in bedrooms or home offices.
Customers report liking the timer and say the unit does not disturb sleep or concentration.

Frequently asked questions

What filtration does the FreAire KN6391RGB list?

The listing describes a three-level high-efficiency filtration system and says it filters smoke, pollen, pet dander, odors and particles as small as 0.3 microns.

How large a room does it claim to cover?

The title and feature text state coverage up to 1086 ft². Treat this as a listing claim rather than verified performance.

Can it be used with essential oils?

Yes. The listing says to add 4-5 drops to the aroma pad. Essential oil is not included.

What are the listed dimensions?

The product details give dimensions of 6.1 x 6.1 x 9.7 inches and a weight of 3.02 pounds.