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K&N Round Tapered Universal Air Filter 4in Flange ID x 5.375 Base OD x 4in Top OD x 6.5in H

Marsoni M251S
Sale price$167.99
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Get it in 3 business days with 1 day shipping. Friday, May 29
K&N Round Tapered Universal Air Filter 4in Flange ID x 5.375 Base OD x 4in Top OD x 6.5in HThe RP 4980 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a K&N embossed carbon fiber top for strength and durability. The carbon fiber element adds to the light weight design and gives this filter a smooth glass like finish. The RP 4980 is a clamp on filter that has an inside flange diameter of 4 inches and a flange length of 5 8 inches. The base is 5 3 8 inches and the filter height is 6 1 2 inches. This Part
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
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4.5 ★★★★★
Based on 1473 reviews
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A
Verified Purchase
Aryiea
Whiting, US
★★★★★ 5
Good air purifier - make sure you actually unwrap the filter lol
Style: Medium Room Air Purifier
I'm an idiot and didn't realize the filter that comes already inside it was in there wrapped in plastic for some reason that surpasses my understanding (the whole unit was already wrapped in plastic, why is the filter, which is inside the plastic-wrapped unit, also wrapped in its own separate plastic?? As if we need more plastic in the world...). Anyway, I didn't look inside cuz I thought the filter would just be installed in there and I plugged it in and cheerfully ran it for months til it told me it was time for replace the filter then bought a second filter and went tk take my old one out only to realize I hadn't been filtering anything all that time 😅 oops. Lol. So yeah, make sure you unwrap the filter. Otherwise it's a good little air purifier. Now that the filter is actually installed right, I notice it kicks up higher when we cook or do anything that would lower air quality, so it does seem to be detecting that properly! My allergies do seem better overall. It's pretty quiet when it's on low, but does get loud when it kicks up. I'm OK with that since it pretty much only happens when we cook or if I just put out a candle or something.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2026
M
Verified Purchase
Mike
Boise, US
★★★★★ 4
Air Purifier
Style: Medium Room Air Purifier
Works well small and compact so it can fit in more areas.
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Reviewed in the United States on April 6, 2026
A
Verified Purchase
Andrea
Whiting, US
★★★★★ 1
Not worth it
Style: Medium Room Air Purifier
Disappointed in this air purifier. Doesn't seem to keep the air clean. Air filter needs to be replaced more often than other air purifiers. Unfortunately I can't return this product. Would not recommend this. Buy a Levoit air purifier instead. Works much better and filter doesn't need to be replaced as often.
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Reviewed in the United States on February 18, 2026
J
Verified Purchase
Jack
Bozeman, US
★★★★★ 5
Excellent Performance and Very Easy to Change Filter
Style: Medium Room Air Purifier
Very happy with this air purifier! It works really well and you can actually feel the air getting cleaner after running it for a while. It’s quiet, simple to use, and perfect for a medium-sized room. What I especially love is how easy it is to replace the filter. No complicated steps — just open, swap, and done in minutes. Super convenient and stress-free. For the price, the quality is surprisingly good. Definitely worth it, and I would buy again.
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Reviewed in the United States on March 1, 2026
N
Verified Purchase
Nobu
Chelsea, US
★★★★★ 5
great solid product for the price, easy to use
Style: Medium Room Air Purifier
Bought for a family member to put in his room & it’s been super easy to set up and use. Helps noticeably freshen up the room and keep it smelling better too
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Reviewed in the United States on April 30, 2026

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