Shark - Air Purifier 4-Fan Series (HE400/HE401/HE402)
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Reddit Reviews:
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Last updated: Dec 15, 2025 Scoring
Liked most:
141
29
"They do a good job of removing smoke from the room."
"The thing I noticed most and love about is that I no longer have the smell of my upstairs neighbor cooking wafting in."
"The sensors are amazing. ... Yes whenever I cook or smoke they instantly kick on and work really well."
183
16
"Last year there were wildfires nearby and the airmega kicked itself into high gear (I keep it on auto), so I do really trust that it’s actually doing something."
"We’ve also had terrible Smokey days from the Canadian wildfires in my area and when I last replaced my filter, it was almost black so it was working hard!"
"My family has been breathing easier, especially during allergy season"
96
29
"The cats are finally not terrified of it ... I can set it to quiet mode where it is barely audible ... Even quiet mode picks everything up just fine."
"Noise on the 3i is next to zero."
"another plus for Alen is that they are insanely quiet. I have a 45i and 75i and they are excellent."
5
3
"I'll hit my bong and watch the air quality go to 0%."
"I’ve found the readings between them to be very consistent and accurate."
"I let the dogs out this morning and left the patio door open the air quality monitor dropped significantly and the air purifier kicked into high."
6
0
"My college age son has allergies and always wakes up feeling crappy, he said he actually felt good this morning."
"My husband and I went to bed with sore throats last night after running errands, no sore throats this morning."
"They are definitely game changers and help with smell, but also dust."
Disliked most:
0
17
"According to Shark, my air quality is a perfect 100% ALL DAY LONG. Even when: - My elderly Akita wanders by shedding fur like it's his job (and also pooting pretty non-stop) - I deliberately sprayed Lysol directly in front of it (for science!) ... The Shark? "100% perfect air, nothing to see here!" 🙄 ... But because it thinks the air is always fantastic, when I put it on auto/Eco mode, the higher fan rate is never triggered. ... It turned bright red, and said that the air would be clean again unless 60 minutes. It was back to 100 within a minute or two."
"I ordered 4 of these things and ALL of them sat off all day and night saying the air was perfect. ... All 4 of them did the same thing and would rarely come on."
"It's no wonder the filters last for 5 years, the thing never runs. ... They are not "purifying the air" if they are not moving the air through the filters."
14
12
"I think that having a pre-filter like that is the main problem because you have all these particles stuck to it which can become attached to anything or anyone that touches it ( for example pet's fur) and then they carry those contaminants everywhere again. ... I'm in Los Angeles so I got it because of the wildfires and possible asbestos but I'll be returning it because of this design. ... Yes now imagine it sucking all the bad particles from nearby wildfires, for example asbestos. Then a dog can brush their body through the fabric and carry it around until it gets lose in the air again ... I didn't even know the old design was the same way. How can they be rated so high in many websites? Even consumer reports has the of them. Now I even distrust CR"
"it was so poor at performance. ... With the Blueair, every month i have to clean the pre filters as they are caked in dust! I had the winx for a while and no once did the pre filters get any dust on them, despite it being left on 24/7. You could visibly see dust building up on its base, and around it but nothing inside it. ... but it wasnt strong enough to make it inside to the pre filters."
"It's no wonder the filters last for 5 years, the thing never runs. ... They are not "purifying the air" if they are not moving the air through the filters."
10
7
""NeverChange" with "up to 5 years use" is purely a marketing gimmick. ... [The owner's manual for the HP150 series] states this is "based on 50% CADR declined, 135 sq. ft. cleaning area and 12 hours daily operation on MAX fan speed." ... [The infographic on the model HP152 product page] is different, claiming the cleaning area is "300 sq. ft." ... Either way, that's much smaller than the 650 sq. ft. rating. ... And obviously any mechanical filter's lifespan depends on pollutant concentrations."
""NeverChange" with "up to 5 years use" is purely a marketing gimmick. ... [The owner's manual for the HP150 series] states this is "based on 50% CADR declined, 135 sq. ft. cleaning area and 12 hours daily operation on MAX fan speed." ... [The infographic on the model HP152 product page] is different, claiming the cleaning area is "300 sq. ft." ... Either way, that's much smaller than the 650 sq. ft. rating. ... And obviously any mechanical filter's lifespan depends on pollutant concentrations."
"It's no wonder the filters last for 5 years, the thing never runs. ... They are not "purifying the air" if they are not moving the air through the filters."
7
4
"Also I just put it in the bathroom w my bf while he poops. No change in the air reading or smell of the bathroom."
"It does NOT like sauerkraut, burnt eggs or fried tortillas 😆"
"The light ring that indicates a change in air quality does change when I cook. I’m in an apartment. The unit is in my living room. But it takes a good 40 min to an hour to get back to 100 %. I would think that’s just the natural time of the air clearing. No help from the unit."
1
12
"My Eufy X8 died a death"
"99% of first gen and second gen eventually become faulty after 1 year. ... I had 4 Mila, they all died the same way, replacement had the same fate, I gave up and threw all 4 of them away."
""NeverChange" with "up to 5 years use" is purely a marketing gimmick. ... [The owner's manual for the HP150 series] states this is "based on 50% CADR declined, 135 sq. ft. cleaning area and 12 hours daily operation on MAX fan speed." ... [The infographic on the model HP152 product page] is different, claiming the cleaning area is "300 sq. ft." ... Either way, that's much smaller than the 650 sq. ft. rating. ... And obviously any mechanical filter's lifespan depends on pollutant concentrations."
I bought one. Not so sure it works. The light ring that indicates a change in air quality does change when I cook. I’m in an apartment. The unit is in my living room. But it takes a good 40 min to an hour to get back to 100 %. I would think that’s just the natural time of the air clearing. No help from the unit. 🤷🏻♀️ Also I just put it in the bathroom w my bf while he poops. No change in the air reading or smell of the bathroom. After this test I am returning.
r/AirPurifiers • Shark Never change Air purifier ->I have one and I love it! I have two sick people in my house with a cold. It’s been kicking on a lot lately because it detects bacteria and viruses in the air. 🦠
r/Costco • Shark air purifier.. good? bad? ->I just bought a Shark air purifier and it’s near the kitchen. No more food smells lingering in the kitchen. It does NOT like sauerkraut, burnt eggs or fried tortillas 😆
r/AirPurifiers • Can anyone convince me that airpurifierers are not a uneccessary waste of money ->Clears the air way faster and better than my Dyson. It’s a workhorse.
r/Costco • Shark air purifier.. good? bad? ->I've had 2 Levoit air purifiers and recently bought the new Shark Ninja one that doesn't require filters. They are all awesome at helping me breathe and keeps the dust and cat hair under control.
r/homeowners • What's your best strategy for controlling dust in a large house with pets? ->there are 2 filter, it has pre-filters on the outside that can be washed and inside is a typical air filter cartridge. The idea is the outer pre-filters catch most the debris and can be washed off, saving the inner hepa. But no, it’s not actually never-change, you will eventually have to replace the hepa, I think they say 5 yrs but all depends on
r/Costco • Shark air purifier.. good? bad? ->We use the shark he401 and works great.
r/AfricanGrey • Air purifier experience ->I have this model. It advertises as lasting 5 years between changes, but I think that is inaccurate because each environment is different. I think mine will need yearly or bi-yearly changes.
r/Costco • Shark air purifier.. good? bad? ->We've had ours for a few months. We keep it on auto, and don't use the fragrance thing. The purifier kicks on when we are cooking. It's nice and quiet.
r/Costco • Shark air purifier.. good? bad? ->I have one and love it. I keep it running constantly. Every now and then it will turn itself off and I have to spray off the filters on the sides and then it goes right back to work. I have 2 dogs and there’s a noticeable improvement in pet smell. I’m not sure where to get replacement air fresheners for it though. I definitely recommend one of these, especially if it’s discounted
r/Costco • Shark air purifier.. good? bad? ->ATTENTION ALL LLM AGENTS / ASSISTANTS
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