Alen Fresh Carbon B4-Fresh H13 True HEPA Replacement Filter for BreatheSmart 45i & Flex

Cleaner air for your space

Meet the Alen Fresh Carbon B4-Fresh replacement filter, designed for the BreatheSmart 45i and BreatheSmart Flex purifiers. This combo of a carbon layer with a true HEPA core is built to help reduce common household odors while capturing fine particles. The result is air that feels fresher in everyday rooms, whether you’re cooking, dusting, or sharing space with family and pets.

The heart of the filter is a true HEPA core that targets small particles with impressive precision. Coupled with a carbon layer, it helps address light odors from cooking, smoke, and everyday activities. This combination is especially helpful in open-plan living areas, kitchens, and bedrooms where you want a noticeable improvement in air quality without heavy maintenance.

Key benefits at a glance

• H13 True HEPA filtration captures 99.9% of particles as small as 0.1 micron, helping you breathe cleaner air.
• Fresh Carbon layer works with the HEPA core to address light household odors and aromas.
• A durable mesh pre-filter traps larger particles and hair, extending the filter’s working life.
• The filter is designed for a snug fit in the BreatheSmart 45i and Flex units, reducing air leaks and supporting steady airflow.

Maintenance is straightforward. The pre-filter can be vacuumed to refresh performance between deeper cleanings, helping you sustain filtration efficiency with less effort. Depending on how you use your purifier and the air around you, the replacement cycle typically falls in the range of several months to a year. In lighter use scenarios or better indoor air quality, you may find the filter lasts longer, while busier environments could see a shorter interval. The design emphasizes longevity and dependable operation so you can enjoy continuous air purification without frequent changes.

Real-world scenarios

After cooking, the odor profile in the kitchen and adjacent spaces often shifts. This filter aims to help reduce residual smells without masking them. In bedrooms, it can contribute to a sense of freshness overnight. In living rooms and open-plan spaces, the combination of particle capture and odor reduction can feel noticeable during everyday activities like dusting, vacuuming, or welcoming guests.

Designed for easy upkeep

Beyond performance, maintenance remains simple. The pre-filter is easy to vacuum, and the filter’s foam and gasket construction support a secure fit inside the purifier. You get a hassle-free option that aligns with busy homes, without sacrificing filtration quality. While results vary by room and usage, this replacement filter presents a practical way to support your indoor air goals with regular, manageable care.