# FreAire KN-6391 Air Purifier, 1086 ft²

FreAire KN-6391 is a bedroom-focused air purifier listing a three-level filtration system, 360-degree air outlet, ambient lighting and sleep mode. Its stated room coverage and filtration are manufacturer claims, while the listed dimensions merit checking before purchase.

- [Original product page](https://best-deals.pro/product/freaire-kn-6391-air-purifier)
- [View offer](https://best-deals.pro/visit/freaire-kn-6391-air-purifier)
- Market: US
- Language: en-US
- Currency: USD
- Brand: FreAire
- Model: KN-6391
- Category: Home & Kitchen > Heating, Cooling & Air Quality > Air Purifiers
- Price: 39.99 USD
- Previous price: 109.99 USD
- Discount: 64%
- Price checked: 2026-11-13T05:37:23.604Z
- Rating: 4.8 / 5
- Reviews: 139

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- The listing says the filtration system targets smoke, pollen, pet dander, odors and particles as small as 0.3 microns.
- Dual-channel intake and a 360-degree outlet are paired with claimed coverage up to 1086 ft².
- Sleep mode is claimed to reduce noise to as low as 20 db.
- Three ambient-light options and an aroma pad add bedroom-oriented features. Essential oil is not included.

## Pros

- Sleep mode, ambient lighting and an aroma pad provide features aimed at bedroom use.
- The listing specifies several particle and odor types the filtration system is intended to address.

## Specifications

### Identification
- Model: KN-6391
- Color: White
### Air treatment and operation
- Filtration system: 3-level high-efficiency filtration system
- Particles addressed: air particles as small as 0.3 microns
- Claimed room coverage: 1086 ft²
- Air intake and outlet: dual-channel air inlet and 360-degree air outlet
- Sleep-mode noise claim: 20 db
### Dimensions and installation
- Dimensions listed: 0.01 x 0.01 x 9.7 inches; 3.02 pounds

## Before you buy

- The listing gives a room-coverage claim of up to 1086 ft² but does not state a clean-air delivery rate or the conditions behind that figure. Treat coverage as a manufacturer claim when sizing it for a room.
- The listed dimensions of 0.01 x 0.01 x 9.7 inches look unusual. Confirm the product's actual footprint and dimensions before planning placement.

## A good fit for

- Bedroom or home-office buyers seeking an air purifier with sleep mode and ambient lighting.
- People interested in an aroma-pad feature who are comfortable supplying their own essential oil.

## Less suited to

- Buyers who need independently substantiated room-cleaning rates or clearly documented placement dimensions.

## Customer feedback

Customer feedback is positive about perceived air-cleaning effectiveness, quiet operation, bedroom and small-room suitability, timer use and sleep quality. Those impressions may matter for overnight use, but customer reports do not establish the claimed room coverage or the 20 db sleep-mode figure. The listing separately states that sleep mode lowers the fan to its lowest speed.
- Positive themes: Customers report effective operation and improved air quality.
- Positive themes: Customers appreciate quiet operation and suitability for bedrooms and home offices.
- Positive themes: Feedback mentions timer usefulness and better sleep.

## Frequently asked questions

### What does the listing say the filter targets?
It describes a three-level filtration system for smoke, pollen, pet dander, odors and particles as small as 0.3 microns. These are listing claims, not independently verified results.
### How large a room does it claim to cover?
The listing claims coverage up to 1086 ft². It does not provide a clean-air delivery rate or the conditions used for that figure.
### Can it be used with essential oils?
The listing describes adding 4-5 drops to an aroma pad, but says essential oil is not included.
### What should I verify about its size?
The listed dimensions are 0.01 x 0.01 x 9.7 inches, which look unusual. Confirm the actual dimensions before choosing a placement location.

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## Images

![FreAire KN-6391 Air Purifier, 1086 ft² — 1](https://best-deals.pro/i/FgKyMI1KjCifY_fJRY3DQAt1nM2IUzyB32BjxGqEbwgymQa6SShOBbSC4n1dTl_oPiTLnPAByqpyxAnsEMFoFW-CfaLXPWhgiji37I-WB6wsco9CEHe7ME26.jpg)

![FreAire KN-6391 Air Purifier, 1086 ft² — 2](https://best-deals.pro/i/E5mddX7UFmMIsEDzviKiOA6eSFqaI0fE8XDtwco2M9hXgLOIWvQ_Kr5kb5kJ6O-skHGzUpWV4uHpO5Wg4r6swHsfJQxHG40b-A3BwkOuY0tv3T8zD8IZIVF0.jpg)

![FreAire KN-6391 Air Purifier, 1086 ft² — 3](https://best-deals.pro/i/grtcVIxdtXJSszs-8zwL7l8NW0JZewNAC6HL5XD_PpnogTw3Ga4t5DcXyPli-j9LUMX9WQsnABKQ9LhrjVHrpcc4pw1u0hb0NxM4ve3R-LPZzCD4HatcXRtq.jpg)

![FreAire KN-6391 Air Purifier, 1086 ft² — 4](https://best-deals.pro/i/CnD7u0cMa33GihtftE5ws1KGhhBj7yYPuIA3Ip4BsJ0DzQxrT-o-KLCcsGYxHI0k44XTyRnUHwXPXXV7NwipOGazCtABzcdyDvpIBQzbDROZ5tOKYEcD9Mdo.jpg)

![FreAire KN-6391 Air Purifier, 1086 ft² — 5](https://best-deals.pro/i/ORy0CzBGWUG2b0PZnVD2x7yxVsGRGu3W1u4WC_fis1WURc68vLo3AypsWm4UipWICakJWaH1MEF0I5W4wQpnFMyz8MUXT8RaYF8SxVw3z--s05_BY5Rk3dTh.jpg)

![FreAire KN-6391 Air Purifier, 1086 ft² — 6](https://best-deals.pro/i/I2JK0loSe5uUad7-yMbWdZ7iKI0OwCDCW7XYssTOfn3OiQDBkYyvURiQgmb5ZJyx7lbNxLnua890UM8cl9jLhU40o1LPlJaTwru9PYv30SvmtIIxHPNe7lZV.jpg)