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Hassle-Free Returns & Free ExchangesPre-cut activated carbon pre-filter replacement sized to fit GermGuardian Filter E air purifiers. Traps larger airborne particles before they reach your HEPA filter and adsorbs household odors, helping your main filter last longer between replacements. Four filters per pack — a full year of coverage at the recommended 90-day replacement schedule.
Ships in 24 Business HoursFactory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesPre-cut activated carbon pre-filter replacement sized to fit GermGuardian Filter E air purifiers. Traps larger airborne particles before they reach your HEPA filter and adsorbs household odors, helping your main filter last longer between replacements. Four filters per pack — a full year of coverage at the recommended 90-day replacement schedule.
The HEPA filter in your GermGuardian air purifier does the fine-particle work — the pre-filter is what keeps it from wearing out early. The Filterbuy activated carbon pre-cut pre-filter is a direct replacement for the GermGuardian Filter E, sized to drop into GermGuardian Filter E purifiers with no cutting or trimming.
The carbon layer pulls double duty. First, it captures airborne particles — smoke, smog, debris, lint, pollen, dander and other forms of dust — before they reach the main HEPA filter, so the filter behind it stays cleaner longer. Second, the porous activated carbon adsorbs household odors from cooking, pets, smoke and more, keeping the air moving through your purifier smelling fresh.
Filterbuy builds these pre-filters with coconut shell carbon fiber media that is thicker than typical foam pre-filters, creating more surface area to capture particles and odors without restricting airflow.
For best performance, replace the pre-filter every 90 days — this 4-pack covers a full year on that schedule. Installation takes minutes: pop out the old pre-filter, drop in the new one, and you are done. A QR code on the package links to directions tailored to your specific purifier model.
Every filter is 100% manufactured in the United States and designed with recyclable materials.
| Replaces | GermGuardian Filter E pre-filter | Replacement interval | Every 90 days (recommended) |
| Media | Activated carbon (coconut shell fiber) | Fit | Pre-cut — no trimming required |
| Pack Size | 4 filters | Origin | Made in the USA |
| Compatible Models | GermGuardian AC4100, AC4100CA, AC4150B, AC4150BLCA, AC4150P, AC4150PCA, AC4175, AC4175W | ||
Replaces GermGuardian Filter E pre-filter
Media Activated carbon (coconut shell fiber)
Pack Size 4 filters
Replacement interval Every 90 days (recommended)
Fit Pre-cut — no trimming required
Origin Made in the USA
Compatible Models GermGuardian AC4100, AC4100CA, AC4150B, AC4150BLCA, AC4150P, AC4150PCA, AC4175, AC4175W
At Filterbuy, we don't cut corners—we craft high-quality air filters right here in the USA and ship them to your doorstep for free. No delays, no gimmicks—just clean air, made easy. With thousands of five-star reviews and filters built for real life & every HVAC system, it's no wonder why over 4 million families trust Filterbuy.
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This is pre-cut to match the GermGuardian Filter E pre-filter — no trimming or measuring required. It is compatible with GermGuardian AC4100, AC4100CA, AC4150B, AC4150BLCA, AC4150P, AC4150PCA, AC4175, AC4175W.
Check the model number printed on your purifier's housing against the list at left before ordering. This pre-filter is a direct, pre-cut replacement for the GermGuardian Filter E — no trimming or measuring required. Filterbuy is not affiliated with or endorsed by GermGuardian. Trademarks belong to their respective owners and are used here solely to indicate product compatibility.
Steps may vary by purifier model — scan the QR code on your filter's packaging for directions matched to your specific unit. Replace every 90 days for best performance. See Cut Carbon Filter Replacement Directions
Power off & unplug the unitSafety first.
Remove filterOpen the panel and remove the carbon pre-filter.
Tuck & reattachSet the pre-filter over the HEPA/VOC filter and slide it back in.
Restart your systemClose the panel, plug in, and reset the filter indicator.
If the filter you buy doesn't fit, we'll send you a better size.
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