Filters
2×4 ft replacement HEPA filter
A replacement filter for compatible 2×4 fan filter units.
$598.00–$698.00
Listed price · final total at checkoutSee specs Equipment / Filters
Filters / Flowhoods catalog
20×20×1 in. MERV 11 prefilters
MERV 11 intake prefilters help keep dust off the main HEPA filter. Match the 20 × 20 × 1 in. size to your unit before ordering.
Listed price
$89.00
Price checked September 25, 2026Buy nowCheckout opens on an external retailer’s site. Confirm the final price, options, and delivery charge there before paying.
Delivery: Shipping to the lower 48 states is included in the listed price. Other destinations may cost more.
Product details
Check the fit.
Compare the dimensions, filter, and power requirements with your workspace. Confirm the exact model and options at checkout before ordering.
- Size
- 20 × 20 × 1 in.
- Rating
- MERV 11
- Fit
- FFUs with a 20 × 20 × 1 in. intake prefilter
- Manufacturer
- KETCH, Wichita, Kansas
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