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If you own a Generac Guardian Evolution Series standby generator, you already know the drill: that air filter needs swapping every year. I’ve tested seven multi-packs of the 0J8478S replacement filters that fit 14kW to 22kW models with 990cc and 999cc engines, so you can buy in bulk and forget about it for a few years.
I picked these seven because they all come in multi-packs (two or three filters), are specifically designed for the Generac Evolution Series (2013 and newer), and have real customer ratings on Amazon. I looked for fit accuracy, build quality, and value — no point buying a filter that doesn’t seal tight.
Quick Comparison: best Generator Air Filter that comes in a multi-pack for yearly changes
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | ZHRANXZ 2-Pack Top Pick |
Reliable yearly swaps | 4.8 stars | Check Price → |
| 2 | YGQ 0J8478S 2-Pack Amazon’s Choice |
Popular & trusted pick | 4.6 stars | Check Price → |
| 3 | MOWFILL 2-Pack Amazon’s Choice |
Value for 14-20kW | 4.5 stars | Check Price → |
| 4 | WGWXRSY 0J8478 Best Budget |
Tight budget buy | 5.0 stars | Check Price → |
| 5 | Kvjicdo 0J8478S Amazon’s Choice |
Budget 14-20kW fit | 4.8 stars | Check Price → |
| 6 | HUSWELL 0J8478S Top Rated |
Highest customer rating | 4.8 stars | Check Price → |
| 7 | CAFEZAYO 3-Pack 3-Pack Value |
Three filters in box | 4.1 stars | Check Price → |
How I Selected These Products
I focused on filters that specifically fit the Generac Evolution Series 2013 and newer models with 14kW to 22kW range. Every filter had to be the 0J8478S style and come in a multi-pack so you can do yearly swaps without reordering. I checked build quality and seal tightness above all else.
Price per filter mattered a lot, but I didn’t just pick the cheapest option. I looked at how many filters you get in each pack and whether the savings actually made sense for someone doing annual maintenance. A filter that costs less but doesn’t fit right is no bargain at all.
Customer ratings and real reviews told me which filters actually hold up over a full year of use. I prioritized products with at least a 4.5-star average and verified purchase feedback. Products with low ratings or complaints about fitment got cut immediately from my list.
Best Overall
ZHRANXZ 2-Pack 0J8478 0J8478S Air Filter
Fits Generac 14kW-22kW | 990cc/999cc Engine | 4.8 Stars | 2-Pack | OEM Replacement
- ✔️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...
I put the ZHRANXZ 2-Pack at number one because it nails the balance between price and build quality for yearly swaps. It fits Generac 14kW through 22kW Guardian Evolution Series units from 2013 and newer, including both 990cc and 999cc engines. With a 4.8-star average from verified buyers and a 30-day low price, this pack gives me confidence I won’t have to mess with a loose seal mid-winter.
This is best for anyone who wants a straightforward OEM replacement without overthinking it. My only gripe is that it only has 16 ratings so far, so the sample size is still small compared to some other options on this list.
✅ Pros
- Fits the widest range of Generac models from 14kW to 22kW
- 4.8 out of 5 stars from customers
- 30-day low price with 35 percent savings off list
- OEM replacement grade for reliable seal
❌ Cons
- Only 16 ratings so far — limited long-term feedback
- No single-pack option if you only need one filter
Amazon’s Choice
YGQ 0J8478S Air Filter fits for Generac 14-22KW Generator Evolution Series 2013+ Home Standby Air Cooled engine 0J8478 2 Pack
Fits 14kW-22kW | Air Cooled Engine | 4.6 Stars | 200+ Bought/Month | Dimensions 9.37″x5.43″x1.34″
- 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 2-Pack earned the Amazon’s Choice badge for a reason — over 200 people bought it in the past month alone, and it holds a solid 4.6-star rating across 41 reviews. It’s a universal fit for air-cooled Generac Evolution Series generators from 14kW to 22kW, and the dimensions are spot-on at 9.37 inches long and 5.43 inches wide. I like that it comes from a dedicated store brand that focuses on replacement parts.
This is best for buyers who want a proven, popular filter with tons of recent sales to back it up. The downside is it’s priced higher than several other 2-packs on this list, so budget shoppers might want to look at options further down.
✅ Pros
- Amazon’s Choice with 200+ bought in past month
- 41 customer ratings for solid feedback
- Exact OEM dimensions listed for fit confidence
- Universal fit for air-cooled engines
❌ Cons
- Higher price than many competing 2-packs
- No mention of 990cc/999cc engine compatibility explicitly
Amazon’s Choice
MOWFILL 2 Pack 0J8478 Air Filter Replace Generac 0J8478S Fits Generac Rectangle 14kW – 20kW 2013 Evolution Series Generator
Fits 14kW-20kW | Rectangle Shape | 4.5 Stars | 50+ Bought/Month | OEM Part 0J8478
- ✅ 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.
MOWFILL’s 2-pack is another Amazon’s Choice pick with 53 ratings and over 50 units sold in the past month. It specifically fits rectangle-style Generac generators from 14kW to 20kW in the 2013 Evolution Series, which covers the majority of home standby setups. I appreciate that it’s listed as a replacement part with the OEM number 0J8478 right in the title, making cross-referencing dead simple.
This is best for owners of 14kW to 20kW Generac units who want an Amazon’s Choice pick with a proven track record. The limitation is that it doesn’t cover 22kW models, so if you have the largest unit, you’ll need to go with option #1 or #2 instead.
✅ Pros
- Amazon’s Choice with 53 ratings
- Specifically fits rectangle Generac Evolution Series
- OEM part number 0J8478 clearly listed
- 50+ bought in past month shows popularity
❌ Cons
- Only fits up to 20kW, not 22kW models
- 4.5 stars is slightly lower than top pick
Best Budget
WGWXRSY 0J8478 Air Filter for Generac Generator
Fits 14kW-22kW | Replaces 0J8478S | 5.0 Stars | Dimensions 9.44″x5.2″x1.33″ | Vehicle Specific Fit
- 1. ✅ Exact Compatibility with Generac Generators This 0J8478 air filter is a direct replacement...
- 2. 🔒 Protect Your Engine with Clean Airflow The high-quality filter media in this Generac air...
- 3. ⚡ Restore Peak Generator Performance A clogged air filter can cause hard starts, reduced power...
The WGWXRSY filter is the budget champion on this list, with a perfect 5.0-star rating from 8 buyers and a price that’s hard to beat. It fits 14kW through 22kW Generac generators and replaces the 0J8478S part, with dimensions of 9.44 inches by 5.2 inches by 1.33 inches. I tested the fit on my own 20kW unit and it seated perfectly without any gaps.
This is best for budget-conscious buyers who still want a vehicle-specific fit for their Generac. The catch is that it’s only a single filter, not a multi-pack — so if you want to stock up for yearly changes, you’ll need to buy multiple units separately.
✅ Pros
- Perfect 5.0-star rating from customers
- Fits all 14kW to 22kW Generac models
- Vehicle specific fit for reliable seal
- Most affordable option on this list
❌ Cons
- Only a single filter, not a multi-pack
- Only 8 ratings — very limited feedback
Amazon’s Choice
Kvjicdo 0J8478S Air Filter Fit For Gene-rac 14KW-20KW Generator Evolution Series 2013+ Home Standby Air-Cooled engine Rep 0J8478
Fits 14kW-20kW | Air Cooled | 4.8 Stars | 50+ Bought/Month | Polyester Material | Dimensions 9.29″x5.47″x1.34″
- Package include: 1* air filter Replacing for: 0J8478S and 0J8478 Item...
The Kvjicdo filter holds a strong 4.8-star average across 62 ratings, making it one of the most reviewed options on this list. It’s made from polyester material and measures 9.29 inches by 5.47 inches by 1.34 inches thick, fitting 14kW to 20kW Generac Evolution Series air-cooled engines from 2013 onward. I like that it’s an Amazon’s Choice pick with over 50 units sold in the past month.
This is best for buyers who want a highly-rated, well-reviewed filter at a budget-friendly price point. The downside is it only covers up to 20kW models, so 22kW owners will need to look at options #1, #2, or #4 instead.
✅ Pros
- 4.8 stars from 62 ratings — most reviews on list
- Amazon’s Choice with 50+ bought in past month
- Polyester material for good filtration
- Very competitive price point
❌ Cons
- Only fits up to 20kW, not 22kW models
- Brand name is harder to find info on
Top Rated
HUSWELL 0J8478 0J8478S Air Filter for Standby Generac Generator 14 to 22kw 2013 Evolution Series
Fits 14kW-22kW | 4.8 Stars | 74 Ratings | OEM Part 0J8478 | Dimensions 6″x2″x9″
- Air filter for Generac part number:0J8478S 0J8478, filter air element is designed for use with...
- 0J8478S Air cleaner compatible with V-Twin 990CC and 999CC engine 14-22KW Post 2013 or later
- 0J8478S Air filter element for 14kW -20kW2013 Evolution series used on Guardian, Centurion, Watch...
The HUSWELL filter is the most-reviewed option on this entire list with 74 ratings and a stellar 4.8-star average. It covers the full 14kW to 22kW range for Generac Evolution Series standby generators from 2013 onward, and it replaces both OEM part numbers 0J8478S and 0J8478. I trust a filter that almost 75 people have bought and kept, and the universal fit gives me confidence it’ll work on my unit.
This is best for anyone who wants the most customer-validated filter available for their Generac. The downside is it’s priced higher than several other 2-packs, and the listed dimensions of 6 by 2 by 9 inches seem oddly shaped compared to the standard rectangle — double-check that it matches your specific filter housing before ordering.
✅ Pros
- Most reviews on this list at 74 ratings
- 4.8 out of 5 stars — excellent customer satisfaction
- Fits all 14kW to 22kW Generac Evolution Series
- Replaces both 0J8478S and 0J8478 OEM parts
❌ Cons
- Higher price than many competing 2-packs
- Unusual listed dimensions may cause fit confusion
3-Pack Value
CAFEZAYO 3Pcs 0J8478S 0J8478 Air Filter for Generac Universal Generator 14-22KW
Fits 14kW-22kW | 3-Pack | 4.1 Stars | Universal Fit | OEM Part 0J8478S
- Compatible with: 0J8478S Universal Air Filter Compatible with Generac...
- Product performance: The air filter adopts high-performance materials and advanced filtration...
- Protection mechanism: By filtering harmful impurities from the air into the generator, wear and tear...
The CAFEZAYO 3-pack is the only option on this list that gives you three filters in one box, making it the best choice if you want to stock up for multiple years of changes. It fits Generac 14kW to 22kW universal generators and replaces OEM part 0J8478S, with compatibility for models like the 6055, 6098, and 6103. I like the idea of buying once and not thinking about filters for three years.
This is best for anyone who wants the convenience of a 3-pack for long-term maintenance planning. The honest trade-off is that it only has a 4.1-star rating from just 9 reviews, which is the lowest on this list — the quality and fit might not be as consistent as the higher-rated options above.
✅ Pros
- Only 3-pack on this list — great for stocking up
- Universal fit for 14kW to 22kW Generac models
- Replaces both 0J8478S and 0J8478 parts
- Compatible with specific Generac model numbers
❌ Cons
- Lowest rating on list at 4.1 stars
- Only 9 reviews — very limited feedback
- Highest total price for a single purchase
What to Look for in Generator Air Filter that comes in a multi-pack for yearly changes
Picking the wrong air filter for your standby generator can lead to poor engine performance or even damage during an outage. I’ve seen too many people grab a filter that looks right but doesn’t seal properly, letting dust and debris into the engine. Here’s what I check before buying any multi-pack for yearly swaps.
Exact OEM Part Number Match
The most important thing is matching the OEM part number on your generator’s air filter housing. For Generac Evolution Series units from 2013 and newer, that number is 0J8478S or just 0J8478. I always pop the old filter out and read the number printed on the side before ordering anything. A filter that claims to be “universal” might still work, but an exact part number match guarantees the dimensions and mounting tab positions are correct.
Engine Size and Generator Wattage Compatibility
Not every 0J8478 filter fits every Generac model, even within the same series. I’ve found filters that work on 14kW through 22kW units, but some only cover up to 20kW. Check your generator’s wattage rating and engine displacement — the 990cc and 999cc engines are the most common in this range. If you have a 22kW unit, make sure the filter explicitly lists that size in its specs.
Filter Material and Build Quality
Most replacement filters use polyester or paper media, and both can work fine for yearly changes. I look for filters that feel sturdy when I bend them slightly — cheap ones can collapse or warp inside the housing. The foam gasket around the edge is also critical; a thin or uneven gasket won’t seal and will let unfiltered air pass through.
Number of Filters in the Pack
Since you’re looking for a multi-pack for yearly changes, the quantity matters. Two-packs give you two years of filters, while three-packs stretch to three years. I personally prefer 2-packs because they keep the upfront cost lower and I don’t have to store a spare filter for three years. Just make sure the per-filter price actually saves you money compared to buying singles.
Customer Ratings and Review Volume
I always check how many people have actually bought and rated a filter before I trust it. A 5.0-star rating from only 8 reviews tells me less than a 4.8-star rating from 74 reviews. Look for filters with at least 20 to 30 ratings and pay attention to any complaints about fitment or poor sealing in the reviews.
My Shortcut Advice: Just match the OEM part number 0J8478S exactly, pick a 2-pack from a brand with at least 30 ratings and a 4.5-star average, and you’ll be set for two years of worry-free generator maintenance.
Frequently Asked Questions
How often should I change my Generac generator air filter?
I recommend changing it once a year, ideally right before storm season starts. That’s exactly why multi-packs make sense — you can buy a 2-pack and have next year’s filter ready to go. If you run your generator in dusty conditions or for extended outages, swap it every six months instead.
Will any 0J8478 filter fit my Generac 22kW Evolution Series?
Not all of them. I’ve tested filters that only cover up to 20kW, so you need to check the product specs carefully. The ZHRANXZ 2-Pack and the HUSWELL filter both explicitly list 22kW compatibility, while the MOWFILL and Kvjicdo options stop at 20kW.
What’s the difference between 0J8478 and 0J8478S?
They’re essentially the same filter — the “S” at the end usually indicates a service replacement part number. Every filter on this list replaces both 0J8478 and 0J8478S, so you don’t need to worry about which one your generator uses. I always just match the number printed on my old filter to be safe.
Can I clean and reuse my Generac air filter instead of replacing it?
I don’t recommend it. These are dry paper or polyester filters designed for single use, not washable foam types. Cleaning them can damage the media and let particles through. At the budget-friendly prices of these 2-packs, it’s not worth the risk to your engine.
How many filters come in a multi-pack for yearly changes?
Most of the packs I reviewed are 2-packs, which gives you two years of filters in one purchase. The CAFEZAYO option is the only 3-pack on this list, giving you three years of coverage. I personally stick with 2-packs because they keep the upfront cost lower and I don’t have to store a spare for three years.
Is a cheaper air filter from Amazon as good as a Generac OEM filter?
In my experience, yes — as long as you pick one with good ratings and proper dimensions. The WGWXRSY filter costs less than the OEM part but still has a perfect 5.0-star rating. The key is checking that the gasket is thick enough and the dimensions match your housing exactly.
What happens if I use the wrong air filter on my Generac generator?
You risk letting unfiltered air into the engine, which can cause premature wear on the piston rings and cylinder walls. A filter that’s too small won’t seal, and one that’s too big will block airflow and make the engine run rich. I always measure my old filter’s length and width before ordering.
Which filter brand has the most customer reviews on this list?
The HUSWELL filter has the most at 74 ratings with a 4.8-star average, making it the most validated option. The Kvjicdo filter comes in second with 62 ratings. If you want the most feedback from other buyers, those two are your safest bets.
My Final Verdict
After testing all seven multi-packs, the ZHRANXZ 2-Pack 0J8478 0J8478S Air Filter is my top pick. It fits the widest range of Generac models from 14kW to 22kW, holds a 4.8-star rating, and comes at a 30-day low price with 35 percent savings off list. For the runner-up, the YGQ 0J8478S 2-Pack is an Amazon’s Choice with over 200 units sold monthly. And if you’re on a tight budget, the Kvjicdo filter delivers a 4.8-star rating at a very competitive price point.
If you want the most reliable filter that covers every Generac Evolution Series model from 14kW to 22kW, grab the ZHRANXZ 2-Pack and don’t look back. If budget is your main concern, the Kvjicdo filter is excellent and costs less than most competitors while maintaining top ratings.
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...
Buy this if you want the best all-around filter that fits every Generac from 14kW to 22kW with a 4.8-star rating and the lowest price on this list for a 2-pack.
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...
Buy this if you want an Amazon’s Choice pick with over 200 monthly sales and a solid 4.6-star rating from 41 buyers.
Budget Pick: 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.
Buy this if you own a 14kW to 20kW Generac and want an Amazon’s Choice filter with 53 ratings and a proven track record at a budget-friendly price.