Alen
45i/FLEX Essential Filter
B4-Pure
In stock at last check
Image from alen.com
Alen genuine replacement filtration.
- Filter type
- True HEPA, Activated Carbon, Pre-Filter
Verified to fit these purifiers
- Alen BreatheSmart 45i
BreatheSmart 45i
Exact FitCompatibility evidence
Exact replacement-filter compatibility confirmed using official manufacturer information.
Last verified August 20, 2026
- Alen BreatheSmart 45i(opens in a new tab)— Manufacturer product page
- Alen 45i/FLEX Essential Filter(opens in a new tab)— Manufacturer filter page
- Alen BreatheSmart FLEX
BreatheSmart FLEX
Exact FitCompatibility evidence
Exact replacement-filter compatibility confirmed using official manufacturer information.
Last verified August 20, 2026
- Alen BreatheSmart 25i(opens in a new tab)— Manufacturer product page
- Alen 25i Essential Filter(opens in a new tab)— Manufacturer filter page
Where to buy
- Buy at Alen(opens in a new tab)
Alen
Alen 45i/FLEX Essential Filter
$69.00In stock at last checkChecked August 22, 2026
Prices and availability are shown as last recorded and can change at any time. Confirm both on the seller's page before ordering.