Compare Alen BreatheSmart 45i vs Shark MAX HP202

Upgraded carbon options are repeatedly praised for odors, VOCs, and smoke, but the base Pure filter lacks carbon.

One expert-style review liked the charcoal-lined HEPA filter because it helped with odors.

Reviewers liked its airflow design and air movement, with one lab noting wind speed below average.

Most reviewers found the 45i effective at cleaning air quickly, though two customers reported poor or contaminated performance.

Most reviewers said the unit improved air quality, cleaned rooms quickly, or worked well, though a smaller group reported weak performance or failures.

The laser particle sensor drew strong praise for accuracy and responsiveness to changing air conditions.

Sensor feedback was the most divided area: many liked the live readings, but repeated customers reported stuck 0%, unrealistic 100%, or humidifier-triggered readings.

Customers and reviewers credited the unit or its HEPA filter with allergy, allergen, and mold-related benefits.

Customers often reported allergy, breathing, asthma, or irritation relief, including homes with pets and dusty conditions.

App support is useful when available, but evidence is mixed because some units lacked Wi-Fi or made app support unclear.

Auto mode is consistently described as responsive, handy, and useful for hands-off operation.

Auto mode was praised for reacting to cooking, smoke, and pollutants, but several owners disliked ramping, cycling, or failure to reach stable readings.

Expert reviews strongly praise the body, fan, filters, and overall construction quality.

Build impressions were positive where mentioned, including a customer who said the unit physically held up under an accidental fall.

CADR evidence is positive overall, though some reviewers note stronger or cheaper competitors.

Child lock and lock controls are presented as useful parts of the control layout.

The only condition evidence is a strongly negative customer report of receiving a used, scuffed unit.

One owner reported the unit worked fine immediately out of the box.

The top-mounted, clearly labeled control panel is treated as convenient and easy to use.

Customer support evidence was negative, with one owner saying they could not contact anyone after the unit failed.

Reviewers like the discreet, customizable design and swappable front panels.

Design comments were generally favorable, with owners calling it attractive, good-looking, and suitable for bedrooms or living spaces.

Display and control readability are praised, with one minor complaint about the Turbo label.

Reviewers liked the clear digital readout, clean-air percentage, and easy-to-understand display.

Documentation was mixed: one owner praised the manual access, while another said troubleshooting directions did not resolve the failure.

Durability evidence is favorable, including durable construction and a two-year owner report.

Durability was a major concern, with many customers reporting failures within weeks, months, or about a year.

Dust removal is usually praised, but one customer said it did nothing for visible dust.

Dust removal was usually praised by pet owners and dusty-home reviewers, though one apartment reviewer found it weak unless run constantly.

Setup, controls, and filter access are repeatedly described as easy and intuitive.

Set-up and daily operation were widely described as easy, with several users praising set-and-forget operation.

Energy use is a recurring strength, with reviewers calling it efficient and low-cost to run.

Multiple fan speeds, including turbo, are useful and let reviewers balance cleaning and noise.

Fan-speed control was useful, but higher speeds and speed changes could bring noticeable noise.

Filter availability is a strength because reviewers note Alen still supports much older models.

Filter availability was mixed: one customer found filters readily available, while another could not find Shark-brand replacements.

Filter life is viewed positively, with filters described as lasting about nine months to a year.

Filter life evidence was mixed, ranging from long-lasting filters to complaints that the filter dropped quickly or lasted only two months.

Filter cost is moderate: not the cheapest, but competitive when paired with energy costs.

Filter cost drew repeated complaints, though a few buyers found filters reasonable or saw savings from cleanable parts.

The combined filter system and optional filter types are praised for matching different use cases.

Handles are repeatedly praised for making the unit easier to move around the home.

HEPA filtration is praised as medical-grade or effective for small particles and allergens.

HEPA filtration was cited positively by reviewers who connected it with solid cleaning performance.

Indicator lights are useful for status, filter condition, and air quality feedback.

The color light indicator was liked because it made air quality status easy to understand.

Maintenance and filter access are generally easy, though one reviewer disliked the attached pre-filter.

Filter changes and basic upkeep were often easy, but reset problems and sensor cleaning complaints were recurring negatives.

Mold reduction evidence comes from praise for the HEPA filter's ability to handle mold particles.

Noise is a major strength at low and quiet speeds, although higher settings are more audible.

Most reviewers found low or auto settings quiet, while high speed, cycling, or failing auto mode could become loud or annoying.

Odor reduction depends heavily on filter choice: upgraded carbon filters help, while the base filter leaves odors.

Odor reduction was often strong for cooking, smoke, pets, and skunk smell, but several pet-odor and apartment reviews were disappointed.

Overall sentiment is favorable, with strong expert approval and mostly enthusiastic customers despite two bad experiences.

Overall satisfaction leaned positive, with many repeat purchases and recommendations, offset by strong dissatisfaction from failed units.

Ozone evidence is reassuring, with zero or very low measured emissions and a disable option.

Particle removal is strongly supported by lab tests and owner observations.

One review praised broad sensing across dust, allergens, dander, and smoke.

Pet owners commonly credited the unit with helping dander, pet hair, and pet-related air quality.

Pollen evidence is limited but positive from a customer connecting it to stuffy-nose relief.

Portability is supported by positive comments about the rear handle and easy movement.

Owners liked being able to move the unit between rooms and described it as lightweight.

Power consumption is low in operation, with a caveat about standby draw.

Pre-filter evidence is mixed: it catches larger particles but can be harder to clean than a separate pre-filter.

Real-time monitoring is repeatedly praised for clear feedback and quick detection.

The live clean-air percentage and visible air-quality feedback were repeatedly praised when the sensor worked.

Reliability evidence is positive but limited, mainly from long-term ownership and brand support.

Reliability was polarized: some units worked for a year or more, while many others developed sensor or power failures.

Remote control is mixed because the base model lacks it, while app-enabled units can be controlled remotely.

Replacement evidence was mixed, with some easy warranty or company replacements and others frustrated by returns or unresolved requests.

Room coverage is best for medium spaces; reviewers caution against very large rooms.

Many owners felt it handled large rooms, multiple rooms, or separate levels, while a few found real-world coverage weaker than claimed.

Size is mixed: slim enough in depth, but still bulky compared with some competitors.

The unit was sometimes praised as compact or space-saving, though one customer found it larger than expected.

Sleep mode was praised for dimming lights and making bedroom use easier.

Smart features are useful but not central, with app tracking and Wi-Fi treated as modest extras.

Smart-feature evidence was positive for useful controls and display features but negative where customers wanted remote control or lost sensor/filter-life functions.

Smoke removal is good for particles, but stronger smoke/gas performance requires upgraded carbon filters.

Smoke removal was a repeated strength in cooking, cigarette, neighbor-smoke, and wildfire-smoke scenarios, though one wildfire review was disappointed.

True HEPA evidence is positive, including long-lasting and independently verified H13 filter comments.

Value is mixed: several reviewers call it worth the cost, but it is not a budget pick.

Value was sharply split: happy owners called it worth the price, while failure, filter cost, or disappointing odor control made others call it overpriced.

VOC reduction depends on upgraded filters; reviewers say the Pure filter is weak for VOCs.

Warranty coverage is seen as valuable, but it depends on registration and OEM filter use.

One customer valued being able to clean part of the filter with a rag and avoid frequent filter buying.