Fellowes AeraMax SE 9794601 (White, 32cm x 32cm x 74cm)

How often do the filters need replacing and what do they cost?

The H13 True HEPA filters are rated for approximately one year of use, though actual lifespan depends on air quality conditions and usage patterns. A complete filter replacement set costs around £150 and includes both main HEPA filters plus washable pre-filters. The dual-filter design means higher initial cost but longer service life compared to single-filter units that require more frequent changes.

What room size is this purifier actually suitable for?

The unit is rated for 915 square feet with 3 air changes per hour, or 549 square feet with 5 air changes per hour. However, ceiling height significantly affects performance - the rating assumes standard 8-9 foot ceilings. For rooms with 12+ foot ceilings, reduce the effective coverage area proportionally. The unit works best in single large rooms rather than trying to purify multiple connected spaces.

How loud is this purifier during normal operation?

On speed 1, the unit operates virtually silently and is barely audible even in quiet bedrooms. Speed 2 produces minimal noise - described as extremely quiet with just a soft whoosh of airflow. Speeds 3 and 4 are progressively louder but maintain a pleasant white noise character without annoying whines or mechanical sounds. Sleep mode operates at the quietest level with all display lights dimmed.

Does the app control work reliably and what features does it include?

The app provides remote control over fan speeds, scheduling and monitoring functions. Users can view real-time PM2.5 readings, adjust settings remotely and receive filter replacement notifications. However, the unit doesn't remember previous settings after power outages and always defaults to auto mode when restarted, which some users find inconvenient for consistent manual speed preferences.

How effective is this purifier against pet odours and allergens?

The H13 True HEPA filtration captures 99.95% of particles including pet dander, whilst the activated carbon component addresses odours from litter boxes and general pet smells. Users report noticeable improvements in both air freshness and allergy symptoms. The large coverage area makes it particularly effective for homes with multiple pets or larger animals that produce more allergens.

Is this purifier suitable for people with severe asthma or allergies?

Yes, the H13 True HEPA standard exceeds typical home air purifier specifications and approaches medical-grade filtration. It captures particles as small as 0.1 microns, including fine allergens that trigger severe reactions. The continuous air quality monitoring ensures consistent protection, automatically increasing purification when allergen levels rise during high pollen seasons or dusty conditions.

How difficult is maintenance and filter replacement?

Maintenance is straightforward thanks to magnetic side panels that open easily without tools. The pre-filters can be removed and washed monthly to extend main filter life. Main filter replacement involves lifting out the old filters and sliding in new ones - no complex installation required. Magnetic safety switches automatically shut off the unit when panels are opened for safe maintenance.

What's the power consumption and does it have energy-saving features?

The unit operates on corded electric power with variable consumption based on fan speed. The AeraSmart sensor provides energy efficiency by automatically reducing fan speed when air quality is good, preventing unnecessary power usage. Sleep mode further reduces consumption whilst maintaining basic air circulation. The precise power ratings aren't specified, but the automatic adjustment system helps minimise running costs compared to units that operate at constant high speeds.