Plenums & Filter Boxes Market Value
Analysis of 2,939 eBay listings for plenums and filter boxes.
What you'll usually pay
💡 Used ones cost about 7% more here.
👉 In short easy summary
The best value is found in square units, while rectangle shapes command a 296% premium. Round units are significantly more expensive than the market median, showing a 128% increase.
Price by shape
Why? Price varies significantly by geometry, with rectangle units at 129 and not specified units at 38.13.
Price by color
Why? Specialty finishes impact cost, with silver units reaching 139 compared to white units at 47.21.
🛒 Some on sale right now
Common questions
What is the typical cost for a plenum or filter box?
The market median price is 32.58.
How does the price of round units compare to the median?
Round units have a median price of 74.29, which is a 128% increase over the market median.
Are new units generally cheaper than used ones?
New units have a median of 37.78, while used units are slightly higher at 40.47.
How we got these numbers
Worked out from 200 live eBay listings (price range $9–$196, odd outliers ignored). These are asking prices, so use them as a guide. Last checked July 26, 2026.