The Shark Air Purifier 4 quietly distributes air through 4 powerful fans. Clean Sense IQ technology tracks air quality & auto-adjusts power to constantly maintain clean air in your home. A Shark Anti-Allergen HEPA Filter captures airborne allergens, dust, dander, and particles. Advanced odor protection guards against cooking smells, smoke, and more. Cleans up to 1,000 square feet.
Q: What is the cost of replacement filters?
A: Good luck with finding a filter no one has had them for MONTHS!!! Not even the shark website
A: I've had my Shark 600 series for 3 days, and it never went off of 100%. I questioned this bc I have 3 cats and live off a gravel road. So after reading all I could about the Shark purifiers I tried putting it in the kitchen when I was cooking beacon. It was only a few minutes be for it went red. So I know it's working. Have you tried that?
Q: How often does the filter need replacing? Can one clean it in between replacements?
A: We recommend changing the filter every 6-12 months. When the filter needs to be changed, the FILTER LIFE button will flash. The filters are not washable.
A: I have ours centrally located in our apartment. I think that if you are closing doors off it would impact how well it worked. I just keep the room doors open and it has done an outstanding job of keeping the air quality good.
Q: Does the HEPA filter help with weed smoke? No one asked so I figured I would get the ball rolling.
A: Yes, it will filter any small particles in the air. It will filter weed smoke by capturing the fine airborne particles in the filter. Some of these particles cause odor which can also be reduced. My daughter lit a candle the other day and I was surprised that our filter detected the extra particles in the air and filtered them. Particles that land and cling to surfaces will not be filtered so it won’t be enough to eliminate odors but will reduce them so it “helps” with weed smoke.
A: i Have severe dog allergies and two dogs. One dog sleeps in my sons room and sheds badly even with Zyrtec I still can’t be in the room. I feel asleep in the room and was fine with the purifier and my little one no longer wakes up with sniffles
Q: Is this effective at getting rid of mold spores in the air.
A: I perused the questions to seek out this same thing. There are two questions on this subject and Shark hasn't responded to either, although they have responded to other questions within the same time frame. I was very interested in this unit, but this leads me to believe I can't depend on it for helping with the mold issue in my place, which is imperative. For that reason I will need to choose something else as a non answer has to be taken as a negative answer.
Q: Does this remove radon from the air
A: According to the manual, radon is not covered. Your crawlspace should be covered in 6 mill plastic sheeting to help prevent radon.
Customers are satisfied with the Air Purifier 4's ability to improve air quality and reduce odors, finding it quiet on lower settings and easy to use. Many appreciate its size and the auto mode, while some find the filter replacement cost to be high. Positive feedback also highlights the purifier's performance in allergy relief and its coverage area.
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

The Shark Air Purifier 4 quietly distributes air through 4 powerful fans. Clean Sense IQ technology tracks air quality & auto-adjusts power to constantly maintain clean air in your home. A Shark Anti-Allergen HEPA Filter captures airborne allergens, dust, dander, and particles. Advanced odor protection guards against cooking smells, smoke, and more. Cleans up to 1,000 square feet.

The Shark NeverChange Air Purifier MAX is designed for 10x longer filter life, saving you $300 or more in filter replacement costs over 5 years*. It captures 99.98% of airborne particles like allergens*, dust, and dander (based on IEST-RP-CC007.3, 0.1-0.2 microns). It covers up to 1400 sq. ft. for powerful, multi-room purification. Odor Neutralizer Technology guards against odors throughout your home, releasing a fresh scent into your air for 2x better odor reduction vs. filtration alone, Based on ASTM E544 vs. HP300 with filter and carbon only, after 30 minutes. *Allergen refers to non-living matter. *Vs. cost of replacing filters on a competitor unit over 5-year period in 300 square foot space.

The Shark Clean Sense Air Purifier MAX with Odor Neutralizer Technology uses Pure Air MicroForce to deliver fast, powerful, and quiet purification for up to 1200 sq. ft. A True HEPA filter captures 99.98% of airborne particles (based on IEST-RP-CC007.3, 0.1-0.2 microns). Odor Neutralizer Technology guards against odors throughout your home.

The Shark Air Purifier uses Pure Air Microforce to deliver fast, powerful, and quiet purification. Clean Sense IQ senses air quality & auto-adjusts to improve air quality and report results in real time. A HEPA filter captures 99.98% of airborne particles like allergens*, dust, and dander (based on IEST-RP-CC007.3, 0.1-0.2 microns). Cleans up to 1200 square feet.
| Pros for Shark - Air Purifier 4 with Anti-Allergen Multi-Filter & Advanced Odor Lock, 1,000 sq. ft - Charcoal Gray | |||
|---|---|---|---|
| Air Quality, Noise Level, Odor Removal, Ease of use, Performance | Air Quality, Noise Level, Overall Performance, Odor Removal, Filter Life | Air Quality, Noise Level, Odor Removal, Overall Performance, Ease of use | Air Quality, Noise Level, Odor Removal, Performance, Ease of use |
| Cons for Shark - Air Purifier 4 with Anti-Allergen Multi-Filter & Advanced Odor Lock, 1,000 sq. ft - Charcoal Gray | |||
| Filter Price | There were no cons for this product— | Filter Life | Display Brightness, Sensor Reliability |