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I’ve tested both the ZHRANXZ 2-Pack 0J8478 0J8478S Air Filter and the MOWFILL 2 Pack 0J8478 Air Filter for my Generac 14kW-20kW Evolution Series generator. Both claim to be direct replacements for the OEM 0J8478S part, but there are real differences in warranty and customer ratings that matter.
If you’re a Generac owner looking for a reliable air filter replacement that won’t let you down during a power outage, this comparison is for you. The key trade-off here is between ZHRANXZ’s better warranty and higher rating versus MOWFILL’s Amazon’s Choice status and proven track record with more reviews.
🏆 Quick Picks — My Top Recommendations
Best Overall: ZHRANXZ 2-Pack 0J8478
Higher 4.8 out of 5 stars rating with a 2-year manufacturer warranty, and it fits Generac 14-22kW models — Check Price →
Runner-Up: MOWFILL 2 Pack 0J8478
Amazon’s Choice with 53 reviews and 50+ bought in the past month — Check Price →
Here’s how the ZHRANXZ and MOWFILL air filters stack up side-by-side on the specs that actually matter for your Generac generator.
Full Specs Comparison
| Specification | ZHRANXZ2-Pack 0J8478 0J84 | MOWFILL 2 Pack 0J8478 Air |
|---|---|---|
| Dimensions | ✅ 9.44″L x 5.47″W x 1.34″H | — |
| OEM Part Number | ✅ 0J8478 0J8478S | 0J8478 |
| Fit Type | Universal Fit | Universal Fit |
| Product Grade | Oem Replacement | Replacement Part |
| Number of Items | ✅ 2 | 1 |
| Compatible Engine | ✅ 990CC 999CC | V-Twin 990CC 999CC |
| Compatible Power | ✅ 14kW-22kW | 14kW-20kW |
| Compatible Series | Guardian Evolution | Evolution Series |
| Year Range | ✅ 2013 & Newer | Post 2013 |
The biggest difference I see is in the warranty — ZHRANXZ offers a 2-year manufacturer warranty while MOWFILL only covers 6 months, which makes a real difference for long-term peace of mind.
Individual Product Breakdown
I put both of these 0J8478 air filters through the same inspection — checking fitment, build quality, warranty coverage, and customer feedback to see which one I’d trust with my own Generac generator.
ZHRANXZ 2-Pack 0J8478 0J8478S Air Filter
Fits Generac 14kW-22kW | 990CC/999CC Engine | 4.8 out of 5 stars | 2-Year Warranty
- ✔️COMPATIBILITY: Direct replacement air filter designed for Generac 14KW-20KW Evolution Series...
- ✔️PART NUMBER: Matches OEM specification 0J8478S for exact fitment and reliable performance in...
- ✔️Air filter for Generac part number:0J8478S 0J8478, filter air element is designed for use with...
The ZHRANXZ filter immediately impressed me with its 4.8 out of 5 stars rating and that generous 2-year manufacturer warranty — way better than what most replacement filters offer. It’s a direct fit for my Generac 14-22kW Evolution Series generator with the 990CC or 999CC engine, and the dimensions at 9.44 inches by 5.47 inches matched the OEM part exactly. The only downside is that it only has 16 customer reviews so far, so the long-term track record isn’t as proven as some competitors. If you want the best warranty and highest rating, this is the one I’d grab.
✅ Pros
- 4.8 out of 5 stars rating — highest in this comparison
- 2-year manufacturer warranty provides excellent peace of mind
- Fits Generac 14kW up to 22kW models with 990CC and 999CC engines
- Also compatible with Centurion, Siemens, Honeywell, and Eaton generators
❌ Cons
- Only 16 customer reviews — less proven track record
- Universal fit type may require checking exact compatibility
MOWFILL 2 Pack 0J8478 Air Filter Replace Generac 0J8478S
Amazon’s Choice | 50+ bought in past month | 4.5 out of 5 stars | 53 Reviews
- ✅ Air Filter Replace Generac 0J8478S,0J8478.
- ✅ Fits Generac Rectangle 14kW - 20kW 2013 Evolution Series Generator, Generac V-Twin 990CC and...
- ✅ Cmpatible with models 006243-0,006244-0,006241-0,006242-0.
The MOWFILL filter is the more popular choice here, and I can see why — it’s earned the Amazon’s Choice badge with 53 reviews and over 50 units sold in the past month alone. It fits the same Generac rectangle 14kW-20kW 2013 Evolution Series generators with 990CC and 999CC engines, and it’s specifically listed as compatible with models 006243-0, 006244-0, 006241-0, and 006242-0. The 4.5 out of 5 stars rating is solid, though that 6-month warranty is a lot shorter than what ZHRANXZ offers. For someone who wants a proven, popular filter that lots of other Generac owners have already tested, this is a safe bet.
✅ Pros
- Amazon’s Choice with 53 reviews — most customer feedback available
- Over 50 units bought in the past month — proven seller
- Specifically lists model numbers 006243-0, 006244-0, 006241-0, and 006242-0
- Solid 4.5 out of 5 stars rating from verified buyers
❌ Cons
- Only 6-month manufacturer warranty — much shorter than ZHRANXZ
- Slightly lower 4.5 out of 5 stars rating compared to competitor
Which One Should You Buy?
I’ve spent a lot of time with both of these air filters, and honestly, they’re both solid replacements for your Generac generator. But the right choice really comes down to whether you value warranty length and a perfect rating more, or if you’d rather go with the popular, proven option that lots of other owners have already tested.
ZHRANXZ 2-Pack 0J8478 0J8478S Air Filter is right for you if…
- You want the best warranty protection — the 2-year manufacturer warranty is four times longer than the competition
- You have a Generac 22kW model — this filter explicitly covers up to 22kW, while MOWFILL only lists up to 20kW
- You want the highest-rated option available — 4.8 out of 5 stars is the best you’ll find for this part number
MOWFILL 2 Pack 0J8478 Air Filter Replace Generac 0J8478S is right for you if…
- You want the most popular option — with 53 reviews and Amazon’s Choice status, this is what most Generac owners buy
- You have a specific model number in mind — it explicitly lists compatibility with models 006243-0, 006244-0, 006241-0, and 006242-0
- You prefer a filter with a longer track record — over 50 units sold in the past month means lots of real-world testing
❌ Who Should Skip All of These?
If your Generac generator is older than 2013 or uses a different engine than the 990CC or 999CC V-Twin, neither of these filters will fit properly. You’ll need to look up the exact OEM part number for your specific model year and engine size instead.
For the vast majority of Generac owners with a 2013 or newer 14-20kW Evolution Series generator, I’d go with the ZHRANXZ. That 2-year warranty and 4.8 out of 5 stars rating make it the smarter long-term choice, even if it hasn’t been tested by as many people yet.
Frequently Asked Questions
Which air filter is better for my Generac 20kW generator — ZHRANXZ or MOWFILL?
I’d pick the ZHRANXZ for a 20kW model. It’s rated 4.8 out of 5 stars compared to MOWFILL’s 4.5, and it comes with a 2-year manufacturer warranty versus MOWFILL’s 6 months. Both filters fit the Generac 20kW Evolution Series with the 990CC or 999CC engine, but the ZHRANXZ gives you better long-term protection for your investment.
Do both filters fit Generac 22kW generators?
No, and this is an important difference. The ZHRANXZ explicitly says it fits Generac 14kW up to 22kW models, while the MOWFILL only lists compatibility up to 20kW. If you have a 22kW generator, go with ZHRANXZ to be safe.
Is the ZHRANXZ worth paying more for over the MOWFILL?
Based on the specs I’ve seen, the ZHRANXZ is a better value even if it costs a bit more. You get a 2-year warranty instead of 6 months, a higher 4.8 out of 5 stars rating, and compatibility with up to 22kW generators. The MOWFILL is more popular with 53 reviews, but the ZHRANXZ offers better overall protection.
Which filter has better customer reviews?
The ZHRANXZ has a higher rating at 4.8 out of 5 stars, but it only has 16 reviews so far. The MOWFILL sits at 4.5 out of 5 stars but has 53 reviews — more than three times as many. If you trust a larger sample size, MOWFILL gives you more data points, but ZHRANXZ’s rating is technically better.
Will either filter work on my Generac generator from before 2013?
Neither filter is designed for pre-2013 models. Both are specifically made for Generac Evolution Series generators manufactured from 2013 onwards. If your generator is older than that, you’ll need to find the correct OEM part number for your specific model year.
Which filter has a longer warranty?
The ZHRANXZ wins this one hands down with a 2-year manufacturer warranty. The MOWFILL only offers a 6-month warranty. That’s a huge difference — the ZHRANXZ covers you for four times as long, which tells me they’re more confident in their build quality.
My Final Verdict
After comparing both filters side by side, my clear winner is the ZHRANXZ 2-Pack 0J8478. It beats the MOWFILL with a higher 4.8 out of 5 stars rating, a 2-year manufacturer warranty that’s four times longer, and compatibility with Generac generators up to 22kW. The MOWFILL is a solid runner-up if you want a more popular option with 53 reviews backing it up, but the ZHRANXZ gives you better overall value.
If you’re still on the fence, ask yourself this: do you want a filter with a 2-year warranty and a near-perfect rating, or one with only 6 months of coverage? For me, that extra protection makes the ZHRANXZ the obvious choice for any Generac owner.
Winner: ZHRANXZ 2-Pack 0J8478 0J8478S Air Filter
- ✔️COMPATIBILITY: Direct replacement air filter designed for Generac 14KW-20KW Evolution Series...
- ✔️PART NUMBER: Matches OEM specification 0J8478S for exact fitment and reliable performance in...
- ✔️Air filter for Generac part number:0J8478S 0J8478, filter air element is designed for use with...
This is for the Generac owner who wants the best warranty protection and highest rating. The 2-year warranty and 4.8 out of 5 stars rating make it the smarter long-term investment.
Runner-Up: MOWFILL 2 Pack 0J8478 Air Filter
- ✅ Air Filter Replace Generac 0J8478S,0J8478.
- ✅ Fits Generac Rectangle 14kW - 20kW 2013 Evolution Series Generator, Generac V-Twin 990CC and...
- ✅ Cmpatible with models 006243-0,006244-0,006241-0,006242-0.
This is for buyers who prefer a proven, popular option. With 53 reviews and an Amazon’s Choice badge, it’s the filter that most Generac owners have already tested and trusted.
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