


Cartridge, 20sqft, 2-5/8"ot, 2-5/8"ob, 6-1/4", 8" 4oz
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Cartridge, 20sqft, 2-5/8"ot, 2-5/8"ob, 6-1/4", 8" 4ozThis is an FC 3840 replacement filter cartridge with 20 sqft of filtration area and dimensions: 2 5 8" OT, 2 5 8" Outside Band, 6 1 4" length, and 8" diameter, weighing 4oz.
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Your Cartridge, 20sqft, 2-5/8"ot, 2-5/8"ob, 6-1/4", 8" 4oz orders ship within 1-2 business days.
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- Fast: 2-3 business days
- Express: 1-2 business days
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Exchange/Return Notes
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4.8 ★★★★★
Based on 1395 reviews
Sort
Product Reviews
★★★★★ 5
good price / great filter
Style: 4 PACK, Pattern Name: Standard MERV 8
Aerostar is a good filter / merv 8 is the one for me, great air flow - Heat & AC.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 25, 2026
★★★★★ 5
MERV-8
Style: 6 PACK, Pattern Name: Standard MERV 8
NOT QUITE HOSPITAL RATED, BUT VERY GOOD FILTER AT GOOD PRICE. DON'T CHANGE FILTERS TOO OFTEN: THAT TOP LAYER OF FILTERED MATERIAL STOPS LOTSA SMALLER NASTY BITS FROM GETTING THRU
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 27, 2025
★★★★★ 5
It just works
Style: 6 PACK, Pattern Name: Standard MERV 8
Works exactly as advertised!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 18, 2026
★★★★★ 4
Looks like good quality
Style: 6 PACK, Pattern Name: Standard MERV 8, Style: 6 PACK, Pattern Name: Standard MERV 8
Looks like good quality. Only issues are they are not individually wrapped and the markings are confusing as one side says merv 8 one side says merv 11 and one side says merv 13
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 16, 2025
★★★★★ 5
Fillters
Style: 6 PACK, Pattern Name: Standard MERV 8
Nice hat
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 8, 2026
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