400/400S Replacement Filter for Coway AIRMEGA Max2 - HEPA & Carbon Set

In this review of the 400/400S replacement filter set for the Coway AIRMEGA Max2, the bottom line is straightforward: this is a practical, budget-friendly way to restore strong filtration to a compatible Max2 series purifier. The reviewer found it best for owners who want a like-for-like replacement that traps common allergens and reduces household odors without paying a premium. Installation is simple and the filters perform consistently, though a minority of users noted a temporary smell after unpacking.

Key Features

• Compatibility: Designed to fit Coway AIRMEGA Max2, 400 and 400S models so users get a direct replacement without modification.
• Two-in-one design: The set includes a HEPA and an active carbon layer to capture particles and reduce odors for more comprehensive air cleaning.
• High particle removal: The HEPA portion captures airborne particles down to 0.3 microns, removing common pollen, pet dander and lint.
• Odor control: The active carbon filter targets odors from pets, cooking and smoke as well as volatile organic compounds for fresher indoor air.
• Easy to install: The filters swap in by removing the old set and inserting the new one, with dimensions that match the original part for a hassle-free replacement.
• Durable and affordable: Constructed to last while offering a lower cost option compared with original brand replacements.

Who It's For

This replacement set is aimed at homeowners and apartment dwellers who already own a Coway AIRMEGA Max2, 400 or 400S and need a dependable replacement filter at a lower price than many brand-name parts. It is especially useful for households with pets or seasonal allergies where regular particle and odor removal matters.

It is less suitable for users who require manufacturer-certified parts for warranty reasons or those who demand medical-grade filtration beyond HEPA 0.3 micron performance. Also, a few users sensitive to new materials should allow a short airing out period if they notice any stray smell after unboxing.

Pros & Cons

Pros

• Effective particle capture and odor reduction for everyday home use.
• Solid build quality and a snug fit in Max2 series purifiers.
• Easy to replace at home with no tools required.
• Good value compared with higher cost OEM alternatives.

Cons

• A small number of users reported a slight off-gassing smell initially, which typically dissipates after brief airing.

Specifications

Compatible Models	Coway AIRMEGA Max2, 400, 400S, 400(G), 400S(G)
Filter Type	HEPA and Active Carbon combined set
Particle Capture	HEPA removes particles down to 0.3 microns (99.97% at 0.3 micron)
Odor Removal	Active carbon reduces pet, cooking, cigarette odors and VOCs
Dimensions	14.37 x 11.02 x 1.77 in
Replacement Interval	Carbon filter suggested every 10-14 months for best performance
Materials	HEPA media and FSC-certified paper components

Our Verdict

The 400/400S replacement filter set is a sensible, cost-effective choice for Max2 owners who want reliable particle removal and odor control without overspending. It delivers strong filtration performance, installs easily, and offers good value, making it a practical routine replacement for most households while noting a brief airing period may be advisable for those sensitive to smells.

Frequently Asked Questions

How often should I replace the carbon filter?
The manufacturer guidance recommends replacing the carbon filter every 10-14 months to maintain optimal odor removal.

Will this set fit all Max2 variants?
Yes, it is designed to be compatible with Coway AIRMEGA Max2 and the 400 and 400S series including G variants for a direct fit.

Do these filters remove allergens effectively?
Yes, the HEPA element captures common allergens such as pollen, pet dander and lint, filtering particles down to 0.3 microns.