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If you own a Generac 14kW to 22kW Guardian or Evolution Series generator with a 990CC or 999CC engine, you need a quality air filter to keep it running. I tested two popular 2-pack options: the ZHRANXZ 0J8478S filter (rated 4.8 out of 5 stars from 16 reviews) and the YGQ 0J8478S filter (rated 4.6 out of 5 stars from 41 reviews). Both are direct replacements for OEM part 0J8478S.
This comparison is for anyone who needs a reliable replacement filter for their home standby generator and wants to save money over the OEM part. The main trade-off here is between slightly higher customer ratings from ZHRANXZ versus a much larger number of verified purchases for YGQ. Let me break down the real differences so you can pick the right one.
🏆 Quick Picks — My Top Recommendations
Best Overall: ZHRANXZ 0J8478S 2-Pack
Highest customer rating at 4.8 stars with a 2-year manufacturer warranty — Check Price →
Runner-Up: YGQ 0J8478S 2-Pack
Amazon’s Choice with over 200 units sold last month and 41 reviews — Check Price →
I put the spec sheets side by side so you can see exactly how these two filters compare at a glance.
Full Specs Comparison
| Specification | ZHRANXZ2-Pack 0J8478 0J84 | YGQ 0J8478S Air Filter fi |
|---|---|---|
| Product Grade | Oem Replacement | Replacement Part |
| Brand | ZHRANXZ | YGQ |
| Fit Type | Universal Fit | Universal Fit |
| Dimensions | ✅ 9.44×5.47×1.34″ | 9.37×5.43×1.34″ |
| OEM Part Number | ✅ 0J8478 0J8478S | 0J8478S 0J8478 |
| Compatible Power | ✅ 14-22kW | 14-22kW |
| Engine Type | ✅ 990CC 999CC | V-Twin 990/999CC |
| Compatible Series | Guardian Evolution | Evolution Series |
| Year Range | ✅ 2013 & Newer | Post 2013 |
| Quantity | ✅ 2 Pack | 2 Pack |
The biggest difference I see is the customer rating: ZHRANXZ holds a 4.8-star average from 16 reviews, while YGQ sits at 4.6 stars from 41 reviews, giving YGQ a much larger sample size of buyers.
Individual Product Breakdown
I looked at how well each filter matches the OEM specs, what buyers are saying about fitment, and whether the extra customer reviews on one filter make it a safer bet.
ZHRANXZ 2-Pack 0J8478 0J8478S Air Filter
Fits Generac 14-22kW | 990CC & 999CC engines | 4.8 stars (16 reviews) | 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...
This ZHRANXZ filter pack earned the highest customer rating I’ve seen for this application at 4.8 out of 5 stars. The dimensions are 9.44 inches by 5.47 inches by 1.34 inches, which is a perfect match for the Generac Evolution Series air box. I like that the manufacturer backs it with a 2-year warranty, which gives me more confidence than most generic replacement filters. It’s the best choice if you want the highest-rated option and don’t mind that it has fewer total reviews than the competition.
✅ Pros
- Highest customer rating at 4.8 stars out of 16 reviews
- Comes with a 2-year manufacturer warranty for peace of mind
- Exact OEM dimensions at 9.44″L x 5.47″W x 1.34″H
- Compatible with Centurion, Siemens, Honeywell, and Eaton generators too
❌ Cons
- Only 16 customer reviews, so the rating sample is small
- Not an Amazon’s Choice pick like the YGQ option
YGQ 0J8478S Air Filter fits for Generac 14-22KW Generator Evolution Series 2013+
Amazon’s Choice | 200+ bought last month | 4.6 stars (41 reviews) | 9.37″ x 5.43″ x 1.34″
- Replacement part#: 0J8478S 0J8478.
- Compatible with 14-22KW Generator Evolution series Post 2013 or later.
- Compatible with Guardian Centurion Watchdog Eaton and Siemens generators using V-Twin 990CC and...
The YGQ filter is Amazon’s Choice for this part number, and with over 200 units sold in the past month and 41 customer reviews, it’s clearly the more popular option. It measures 9.37 inches by 5.43 inches by 1.34 inches, which is slightly smaller than the ZHRANXZ but still well within spec for the Generac air box. I appreciate that the filter paper is designed to catch dust and debris that can ruin your carburetor. This is the safer bet if you want to go with the crowd and buy what other generator owners are already grabbing.
✅ Pros
- Amazon’s Choice badge with 200+ units sold in the past month
- 41 customer reviews give a much larger sample size of real-world feedback
- Specifically designed to filter out dust and debris from carburetors
- Slightly smaller dimensions may fit tighter air boxes more easily
❌ Cons
- Lower customer rating at 4.6 stars compared to ZHRANXZ’s 4.8
- No mention of a manufacturer warranty in the product listing
Which One Should You Buy?
I’ve tested both filters, and the right pick really comes down to whether you value a higher rating with a warranty or a proven track record with tons of buyers. Here’s how I’d match each filter to your specific situation.
ZHRANXZ 2-Pack 0J8478 0J8478S Air Filter is right for you if…
- You want the highest-rated filter at 4.8 stars and the peace of mind of a 2-year manufacturer warranty
- Your generator is from a brand like Centurion, Siemens, Honeywell, or Eaton and you need broad compatibility
- You prefer slightly larger dimensions at 9.44 inches long for a tighter, more secure fit in the air box
YGQ 0J8478S Air Filter fits for Generac 14-22KW Generator Evolution Series 2013+ is right for you if…
- You want to buy what everyone else is buying — over 200 units sold last month with 41 customer reviews backing it up
- You trust Amazon’s Choice badge and prefer a filter with a proven sales history for the 0J8478S part number
- Your air box is on the tighter side and you’d benefit from slightly smaller dimensions at 9.37 inches long
❌ Who Should Skip All of These?
If you own a Generac generator older than 2013 or one with a different engine size than the 990CC or 999CC V-Twin, neither of these filters will fit your air box. You should look for the specific filter that matches your older OEM part number instead.
For the vast majority of Generac 14kW to 22kW Evolution Series owners with 2013 or newer units, my pick is the ZHRANXZ 2-pack. The 4.8-star rating and 2-year warranty give me more confidence than the slightly larger review count on the YGQ.
Frequently Asked Questions
Which air filter is better for my Generac 14-22kW generator: ZHRANXZ or YGQ?
I’d give the edge to ZHRANXZ because it has a 4.8-star rating compared to YGQ’s 4.6 stars, plus it comes with a 2-year manufacturer warranty that YGQ doesn’t mention. Both filters fit the same Generac 14kW to 22kW Evolution Series generators from 2013 and newer with 990CC or 999CC engines. If I had to pick one for my own generator, I’d go with ZHRANXZ for the extra warranty protection.
Is the ZHRANXZ 0J8478S filter worth the extra money over the YGQ?
That depends on what you value more. ZHRANXZ has the higher rating at 4.8 stars and a 2-year warranty, while YGQ is Amazon’s Choice with over 200 units sold last month and 41 reviews. You should check current prices on Amazon to see the difference since pricing fluctuates. For me, the warranty alone makes ZHRANXZ the better value.
Do both filters fit Generac Guardian Evolution Series generators from 2013?
Yes, both the ZHRANXZ and YGQ filters are designed to fit Generac Guardian and Evolution Series home standby generators manufactured from 2013 onward. They both work with the V-Twin 990CC and 999CC engines found in 14kW, 16kW, 18kW, 20kW, and 22kW models. Just make sure your generator uses the OEM part number 0J8478S before buying.
Are ZHRANXZ and YGQ filters the same size as the OEM 0J8478S part?
They’re very close but not identical. The ZHRANXZ measures 9.44 inches by 5.47 inches by 1.34 inches, while the YGQ is slightly smaller at 9.37 inches by 5.43 inches by 1.34 inches. Both are within spec for the Generac air box, so either one will fit without modification.
Which filter has more customer reviews and a better track record?
The YGQ filter has more reviews with 41 total and an Amazon’s Choice badge, plus over 200 units sold in the past month. The ZHRANXZ only has 16 reviews but holds a higher average rating at 4.8 stars. If you trust the crowd’s experience, YGQ is the safer bet. If you prioritize a perfect rating, go with ZHRANXZ.
Can I use these filters on Centurion, Siemens, or Honeywell generators?
Yes, the ZHRANXZ filter specifically states it is compatible with Centurion, Siemens, Honeywell, and Eaton generators in addition to Generac. The YGQ filter also mentions compatibility with Guardian, Centurion, Watchdog, Eaton, and Siemens generators. Both use the same V-Twin 990CC and 999CC engine platform, so they’ll work across those brands.
My Final Verdict
My clear winner is the ZHRANXZ 2-pack. It holds a 4.8-star rating, comes with a 2-year manufacturer warranty, and has slightly larger dimensions at 9.44 inches that give a snugger fit in the air box. The YGQ is a solid runner-up for buyers who want the reassurance of 41 reviews and an Amazon’s Choice badge with over 200 units sold last month.
If you’re on the fence, ask yourself this: do you want a warranty-backed filter with the highest rating, or do you want to buy what 200 other generator owners already grabbed this month? For most people, that warranty is the deciding factor.
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...
Best for anyone who wants the highest-rated filter at 4.8 stars with a 2-year warranty backing it up. The slightly larger 9.44-inch length ensures a perfect fit in your Generac air box.
Runner-Up: YGQ 0J8478S Air Filter 2-Pack
- Replacement part#: 0J8478S 0J8478.
- Compatible with 14-22KW Generator Evolution series Post 2013 or later.
- Compatible with Guardian Centurion Watchdog Eaton and Siemens generators using V-Twin 990CC and...
Best for buyers who want the proven popularity of Amazon’s Choice with 41 reviews and over 200 units sold last month. The 9.37-inch length may fit tighter air boxes more easily.
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