Alen BreatheSmart 45i

Alen BreatheSmart 45i Quick Review

Think about it as an upgraded version to Flex, Alen BreatheSmart 45i is THE favor of the month with extended purifying coverage and improved airflow circulation against airborne microorganisms and allergens. On top of existing Alen trademark lifetime warranty and personalizable front panel, Alen BreatheSmart 45i provide exceptional value for pet owner or asthmatic patient that is frequently impacted by airborne irritants. Comparing the BreatheSmart series on airflow delivery rate, applicable radius, noise level and power consumption, what newer features can you expect from Alen BreatheSmart 45i air purifier?
+- 429 p
     Annual filter ^    
+- 39 - 118 p
Online price*
Latest Amazon price

Alen BreatheSmart 45i Specification

ProductAlen BreatheSmart 45i
15 x 25 x 8.5 in
(38.1 x 63.5 x 21.6 cm)
Weight15 lb (6.8 kg)
Coverage (up to)800 sq. ft. (74 m2)
Dust free (CADR)245 cfm (416 m3/h)
Pollen free (CADR)245 cfm (416 m3/h)
Smoke free (CADR)245 cfm (416 m3/h)
Airflow speed53 - 190 cfm (90 - 323 m3/h)
A filterAnnual filter cost ($)+- 39 - 118
- Lifespan
- Replacement cost ($)
Washable Pre-filter (with HEPA filter)
6 - 18 months
HEPA filter
- Lifespan
- Replacement cost ($)
HEPA-Pure Filter FL40
6 - 18 months
+- 59
Carbon filter
- Lifespan
- Replacement cost ($)
Ionizer/ TechnologiesIonizer
UV-light/ PCO
Other filter
All-in-one filter
- Lifespan
- Replacement cost ($)
Optional/ Addon
6 - 18 months+- 79
HEPA-OdorCell Filter FL40-MP
6 - 18 months+- 89
HEPA-Fresh Filter FL40-CARBON
6 - 18 months+- 69
Noise level55 dB
Power consumption50 W
Timer/ Scheduler2, 4, 12 hours
SensorsIntelligent sensor
More color options
Auto mode
Air qualityAQ indicator
Filter change indicator
Wi-Fi/ BTBluetooth
Remote control
Child lock
WarrantyLifetime Limited Warranty
Email/ Phone support

Product image

Alen BreatheSmart 45i key features

  • 3-stage filtration with ionizer
  • Washable pre-filter/ HEPA-Pure filter - [Optional] HEPA-Silver filter, HEPA-FreshPlus filter, HEPA-OdorCell filter
  • 4 fan speeds with auto mode/ lights-off mode
  • Smart Filter Light indicator
  • intelligent sensor technology
  • Personalizable front panel design
  • Generate soothing pink noise frequency to enhance sleep up to 25% better
  • Child-lock control panel and child-safe vent guard
  • 4, 8, 12 hour Pre-set timer
  • Forever guarantee warranty
Alen BreatheSmart 45i dimension
15 x 25 x 8.5 in
(38.1 x 63.5 x 21.6 cm)
Alen BreatheSmart 45i weight
15 lb (6.8 kg)
Alen BreatheSmart 45i has all the elements of previous BreatheSmart generation design, durability and features for owner that requires absolute familarity. Zero gap between its simpleness body originates from the smooth and well defined framework. In the meantime, control panel are flawlessly attached and ergonomically placed to permit seamless usage. No noticeable off-gassing on Alen BreatheSmart 45i high-grade structure that would impact the solidity of the air purifier. The forever guarantee assurance will allow people continue using the air purifier frequently without have to worry it would wear out.

Airflow efficiency and purifying coverage

The justification why Alen BreatheSmart 45i is the improved version. An air purifier that is appropriate for roomy home, at a significant wider applicable area, the overall air flow delivery is amazing. Generally, places such as living room, office or master bedroom would very likely compliment Alen BreatheSmart 45i best.

Furthermore, Alen BreatheSmart 45i supportive air flow input and output is incredible at wiping off nearby air-borne particles. One example to demonstrate the air purifier effective purifying is nearby airborne particles e.g. dust, pet dander, pollen, mold, mildew and fungus would all be fully taken up and captured.

Noise level and power consumption

Alen BreatheSmart 45i specifically built framework is outstanding at diminishing noise developed from the fan to a minimum level. Noise level is rather soft at low/ medium fanspeed and as expected high at fanspeed. When compare to other common household appliances, Alen BreatheSmart 45i noise level is still within a justifiable rate.

In the meantime, Alen BreatheSmart 45i cost-saving airflow purifying would save you tons of money on utility bills in long run. Electricity consumption is quite minimal at low fanspeed and needless to say will jump at higher fan speed. Alen BreatheSmart 45i power usage is marginally lesser when put next to other fairly equivalent household appliances.

noise graph

Final thoughts on Alen BreatheSmart 45i

To sum up, Alen BreatheSmart 45i is what a marvelous air purifier would be. Compare with the entire list of strong points and weak points, the added merits make certain the drawbacks have zero outcome on the air purifier efficiency. Combined the 2 highlights above, we have no reservations strongly recommending Alen BreatheSmart 45i.

Alen BreatheSmart 45i is covered against

Alen BreatheSmart 45i VS Dust



Alen BreatheSmart 45i VS Pollen



Alen BreatheSmart 45i VS Hair

Hair/ Pet hair


Alen BreatheSmart 45i VS Dust mite

Dust mites


Alen BreatheSmart 45i VS Mold/ Mildew

Mold/ Mildew


Alen BreatheSmart 45i VS Pet dander

Pet dander


Alen BreatheSmart 45i VS Virus/ Germ

Virus/ Germ


In general Alen BreatheSmart 45i 3-stage filtration is vastly efficient when pit against large-scale and small scale contaminants, allergens, bacteria and viruses. Driven by immense 53 - 190 cfm airflow circulation and wide 800 sq. ft. purifying coverage, Alen BreatheSmart 45i included Washable Pre-filter (with HEPA filter) HEPA-Pure Filter FL40 filtration is spectacular in eradicating dust, hair, pet hair, dust mites, pollen, mold, spores, mildew, fungi, germs and pet dander. 

In conclusion......

  • As always, there is no shortage of front panel design to choose from.
  • Even wider purifying coverage with superior airflow distribution.
  • Customizable filter with up to 3 optional filter upgrade.
  • Ionizer is ozone-free and can be easily turn on or off.
  • Uses the same Flex filter that is proven and long-lasting (up to 18 months).
  • Newer intelligent sensor that powered the air purifier auto/ lights-off mode.
  • Like most Alen newer air purifiers, you can easily lock 45i controls from your child.
  • Air purifier is guaranteed for life from any manufacturer's defect.
  • Lacks chemical/ odor filtration on the standard HEPA-Pure filter.
  • The 1 filter setup is easy to use, but lacks the filtration depth to compliment the HEPA filter in particle capture.
Build quality
Airflow delivery
Particle Filtration
Smoke Filtration
Alen BreatheSmart 45i

Frequently Asked Questions (FAQ)FAQ

Where is Alen BreatheSmart 45i air purifier made from?

Alen BreatheSmart 45i air purifier is made in China and developed in the United States.

What does Alen BreatheSmart 45i Lifetime Limited Warranty cover?

The Lifetime Limited Warranty cover your Alen BreatheSmart 45i air purifier from defects in materials or workmanship as long as you own it.
******** SIDE NOTE ********
  • Warranty will only be applicable if you are the unit original purchaser and in the US or Mexico.
  • Alen BreatheSmart 45i air purifier must be connected to a proper power supply (see voltage label). Using voltage converter, transformer or plug adapter will effectively void the warranty.
  • Shows no evidence of tampering, accidental damage, mishandling, modification or repair by anyone other than authorized Alen service personnel.
  • Replace the filter as stipulated timeframe in the manual to avoid excessive stress on the motor.
  • Remember to keep your proof of purchase and register your Alen BreatheSmart 45i air purifier at or call 1-800-630-2396 for warranty validation.

What is the differences between each Alen HEPA filters and which Alen BreatheSmart 45i replacement filter should I get?

All Alen BreatheSmart 45i filters are great at addressing dust, allergies and asthma. For a specific concern, choose:

  • HEPA-Pure - standard filter for household allergy relief.
  • HEPA-Silver - advanced all-around solution filter that is best against mold, germs & bacteria.
  • HEPA-Fresh/ HEPA-FreshPlus - chemical filter that is best against strong chemicals, smoke and VOCs.
  • HEPA-OdorCell - odor neutralizer that is best in removing diaper smell and pet odor.

What is the difference between Smart Filter Light and standard Filter Light?

Smart Filter Light calculates the filter lifespan based on actual usage and surrounding environment while standard Filter Light is purely based on runtime. Smart Filter Light is available in Alen BreatheSmart Classic and Fit50.

What is the differences between HEPA-Silver and HEPA-FreshPlus as both comes with activated carbon?

HEPA-Silver comes with 1.5 lbs activated carbon and is ideal against mold, germs & bacteria while HEPA-FreshPlus comes with higher 3 lbs activated carbon that is best against strong chemicals, smoke or VOCs.

How many filters Alen BreatheSmart 45i used?

Alen BreatheSmart 45i uses just one filter that is easy to replace if you discounted the washable pre-filter. You do have the option to choose from 1 of 4 customized filters that contains both HEPA and carbon filter materials.

Which is the best filter for paint, chemicals or formaldehyde fumes??

For chemicals such as VOCs or formaldehyde, choose either HEPA-Fresh that comes with 1.5 lbs activated carbon or the stronger HEPA-Fresh/ HEPA-FreshPlus that comes with 3 lbs activated carbon.

Which is the best filter to get rid of the smoke from wildfire/ wood burning?

For Alen BreatheSmart 45i, choose HEPA-Fresh or HEPA-FreshPlus (depends on model) would be the best option as it comprises 3 pounds of carbon pellets that is effective in absorbing chemicals component released from wood smoke.

Does Alen BreatheSmart 45i get rid of cigarette smoke?

Yes it does but you would have to upgrade the filter to either HEPA-Fresh or HEPA-FreshPlus (depends on model) that comes with thick layer of Activated Carbon.
******** SIDE NOTE ********
  • Alen BreatheSmart 45i will not remove residual smoke/ odors from wall paint, furniture, carpet and drapes.
  • Make sure Alen BreatheSmart 45i is used in the recommended room size or intended source.
  • Run on higher fan speed for maximum efficiency.
  • Avoid smoker from smoking indoor.

Which filter would work best to get rid of musty mold in a basement?

For Alen BreatheSmart 45i, opt for the HEPA Silver filter upgrade as it is designed to tackle mold, germ and bacteria in a basement. A dehumidifier would also be a great help in curbing down microorganism growth.

Which filter do I need to get rid of pet odors and litter box odors?

Yes it can but you have to opt for the HEPA-OdorCell filter upgrade that specialize in eliminating diaper and pet odors.

Which filter in Alen BreatheSmart 45i is best for just eliminating cooking smells in an open kitchen?

You could either opt for HEPA Silver Filter, HEPA FreshPlus or even HEPA-OdorCell filter to eliminate light cooking odors.

Is it possible to use more than 1 customizable filter at the same time?

You can only use one filter at a time in Alen BreatheSmart 45i. Please select the right filter that is best suited to your environment.

How do I reset Alen BreatheSmart 45i filter indicator after I have replaced it with a new filter?

You can reset the filter replacement indicator by holding the button down for about 5 seconds.

Where do I find Alen BreatheSmart 45i replacement filter?

You can find the replacement filter for Alen BreatheSmart 45i from their official website or at Amazon. Refer to the instructional booklet on the correct filter replacement code or through our product specification.

What is the function of SmartSensor with Auto-Mode?

SmartSensor is of course a sensor that detects the level of airborne particles in its surrounding and pass the information to the air purifier. Auto mode is a feature that automatically adjust the fan speed according to the information it received. Only air purifiers equipped with SmartSensor or equivalent sensor with have the Auto mode feature.

Is Alen BreatheSmart 45i air purifier wall mountable?

No Alen BreatheSmart 45i air purifier is not wall mountable.

Which filter does Alen BreatheSmart 45i comes with?

Alen BreatheSmart 45i comes with HEPA-Pure filter by default although user have the option to opt for different set of filter.

Is Alen BreatheSmart 45i's HEPA filter washable?

No Alen BreatheSmart 45i's HEPA filter is not washable as the water flow would damage the filter’s fiber. You should replace the filter instead according to the recommended lifespan or when the filter replacement indicator light lit up.

Can you use an extension cord on Alen BreatheSmart 45i air purifier?

Yes you can extension cord but make sure the cord is not damage in anyway or overloaded from too many connection that would short circuit and damage Alen BreatheSmart 45i air purifier.

Alen BreatheSmart 45i Troubleshooting

Safety Tips


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