• Koch Permanent Stainless Steel Washable Filter, metal-frame reusable air filter for HVAC and commercial kitchen exhaust grease applications, per Koch K985-A. (Photo shows optional bail handles; filters ship without handles by default.)

Representative image — you’ll receive the exact size you select. Actual dimensions are in the specs.

Koch Permanent Stainless Steel Washable Filter (Air or Grease Applications)

  • Pack 12 filters

118-626-154-244

$3,171.84
$3,171.84
Shipping calculated at checkout.
  • Free shipping over $50
  • 30-day returns
  • Secure checkout
  • US-based expert support
Direct from Koch · ships in 1–3 weeks (Aug 30 – Sep 13)
Produced to spec by Koch. Exact ship date confirmed once scheduled in the production queue. See current production schedule.
Special order
See special order policy for full details.
About the filter image
Images are representative across sizes. You'll receive the exact size you select above — actual dimensions are listed in the product specs.
Not sure which size? How to measure · Filter Fit Guarantee

Product details

Per Koch Bulletin K985-A, the Koch Permanent Stainless Steel Washable Filter is a completely washable, reusable air filter designed for air or grease applications. Stainless Steel construction is the premium material option in the Koch Permanent Metal Filter product line, providing the corrosion resistance and durability needed for high-moisture, high-temperature, or chemically demanding environments. Stainless construction is available as a custom material option from Koch — per Koch product literature, "Please consult the factory for specific size and configuration data."

What you get: washable metal-frame filters, sold by the case

Each variant is a complete metal-frame washable filter sized for standard HVAC and grease-application openings. Available in 1″ and 2″ depths, sold by the case in the carton quantities shown:

  • 1″ depth filters:
    • 16″x20″x1″ — available by quote. Request a quote for current pricing.
    • 16″x25″x1″ — 12 filters per case
    • 20″x20″x1″ — available by quote. Request a quote for current pricing.
    • 20″x25″x1″ — 12 filters per case
    • 24″x24″x1″ — additional size — 12 filters per case
  • 2″ depth filters:
    • 16″x20″x2″ — 6 filters per case
    • 16″x25″x2″ — 6 filters per case
    • 20″x20″x2″ — available by quote. Request a quote for current pricing.
    • 20″x25″x2″ — 6 filters per case
    • 24″x24″x2″ — additional size — 6 filters per case

About the handles you see in product photos

The pictured filter shows bail handles, but filters ship without handles by default. Per Koch K985-A: "Filters are furnished without handles, but both bail and ring types are available upon request." If your application needs handles — for frequent removal in commercial kitchen exhaust hoods, equipment access panels, or any setting where the filter is pulled and washed often — contact RTF support before ordering and we'll arrange handles (bail or ring) on your case. Just let us know which handle type and how many filters need them.

Permanent Stainless Steel Filter construction (per Koch K985-A)

  • Material: Stainless Steel
  • Media: Stainless steel mesh construction
  • Frame: All-stainless-steel frame
  • Use case: Premium-tier washable filter for environments where corrosion resistance, high temperatures, or chemical exposure rule out steel or aluminum
  • Reusable: Completely washable (per Koch K985-A)
  • Available depths: 1″ and 2″ (in this RTF lineup); 4″ depth available on request per Koch K985-A
  • Handles: Filters ship without handles by default. Bail or ring handles available on request — see "About the handles you see in product photos" above, or contact RTF support before ordering.
  • Doubled airflow option: Per Koch K985-A, "Both steel and aluminum filters can be operated at twice the CFM capacities listed above, with corresponding increases in pressure drop." (Steel and aluminum specifically; consult Koch for stainless.)
  • 1/8″ and 3/8″ depths: Available on request — request a quote for these custom-thin variants.

Cleaning and maintenance (per Koch K985-A)

Per Koch K985-A, the Permanent Metal Washable Filter is designed for in-service cleaning rather than disposal-and-replace. Koch's published maintenance procedure:

  • Wash: Per Koch K985-A, "Simply wash away dirt with hose or soapy water."
  • Re-coat with adhesive: Per Koch K985-A, "Recoat with adhesive spray before re-using."

This permanent design is what gives metal filters their cost advantage over disposable filters — one filter, washed and recoated as needed, replaces many disposable filter changes over its service life.

Air or grease applications (per Koch K985-A)

Per Koch K985-A, Permanent Metal Washable Filters are specified for both air and grease applications. This dual-application capability reflects two main use cases:

  • HVAC air filtration: Equipment protection and primary particulate capture in commercial and residential HVAC systems where reusable filtration is preferred over disposable filters — especially in dusty environments where rapid loading would shorten disposable filter life.
  • Commercial kitchen exhaust: Range hoods, grill hoods, and other foodservice exhaust applications where grease-laden vapor must be filtered before exhaust ductwork. The metal frame and washable construction handle the high-temperature, grease-saturated airstream that would destroy fiber-based filters. Required in many jurisdictions for foodservice fire-safety compliance.

About permanent metal washable filters

Permanent metal filters as a category trade off particulate efficiency (typical average arrestance for steel and aluminum constructions is in the low- to mid-70% range per Koch K985-A; stainless arrestance varies by mesh specification, contact Koch for spec data) for two critical advantages over disposable filters: reusability (washable cycles instead of replacement) and grease/temperature tolerance (metal mesh stands up to grease and heat that would saturate or melt fiber media). For applications where fine particulate filtration is the goal — office HVAC, sensitive equipment, indoor air quality — you'll want a higher-efficiency disposable pleated filter (MERV 8+) instead. For equipment protection, primary capture, kitchen exhaust, and any setting where filter changes need to be infrequent, permanent metal filters are the right specification.

Sizing and ordering notes

  • Match nominal size to your filter slot. Actual depth is slightly less than nominal (typical pattern: 1″ nominal = ~7/8″ actual; 2″ nominal = ~1-3/4″ actual).
  • Each variant ships in the case quantity shown. Order multiple cases by adjusting the quantity at checkout.
  • Custom thin filters: 1/8″ and 3/8″ depths are available on request from Koch.
  • Need handles? Filters ship without handles by default. Bail or ring handles available on request — contact RTF support before placing your order so we can arrange handles on your case.
  • For grease/kitchen applications: Replace or wash on your maintenance schedule per local fire code requirements (typically 30 days for active foodservice).
  • Cleaning: Per Koch K985-A, hose or soapy water; recoat with adhesive spray before re-using.

Koch product literature

Detailed product specifications and complete performance data for Koch Permanent Metal Washable Filters (Type MS galvanized steel and Type MA aluminum) are published in Koch Bulletin K985-A: Permanent Metal Washable Filters Product Specification PDF (Koch Filter Corporation). Stainless steel construction is available as a custom material option (Koch K985-A documents Type MS and Type MA only). Contact Koch Filter Corporation or RTF for stainless-specific spec data.

Commercial & facilities

Buying filters for a building?

Volume pricing on any size or MERV, plus recurring delivery schedules. We handle facilities and commercial orders daily and can usually match or beat distributor pricing.

Request a quote 1-866-469-8556 Talk to a filter expert
Koch Permanent Stainless Steel Washable Filter (Air or Grease Applications)

$3,171.84
Filter Fit Guarantee
Learn more →
Free Shipping $50+
Lower 48 states
Verified Reviews
Read reviews →
30-Day Returns
Hassle-free →
Expert Support
Talk to us →
Why RememberTheFilter.com

A filtration company, not a warehouse reseller

Family-founded in 2006, built on the back of 50 years of HVAC filtration experience. Two decades selling filters online — and we only stock what we'd put our own name behind.

Trusted manufacturers only

Every filter we sell comes from a manufacturer we've vetted — AAF Flanders, Koch, NaturalAire, PrimeShield, and a short list of others.

No marketplace-style third-party sellers swapping inventory. No overseas knockoffs relabeled with a domestic-sounding name.

Two decades online

RememberTheFilter.com has been selling HVAC filters online since 2006 — family-founded, founder-operated, and still run by the people who started it.

Schools, clinics, property managers, and homeowners have been ordering from us for years — some of them since before Amazon even sold filters.

Nationwide shipping network

Our distribution network ships from multiple U.S. locations — so most orders arrive faster than coast-to-coast routing would suggest.

Customer service is based in Lake Stevens, Washington — U.S.-based, reachable by phone, text, or email.

Commercial & Bulk Orders

Buying this filter for a property, fleet, or facility?

Schools, clinics, property management, multifamily, and government facilities order from us in standing rotation. Volume pricing, tax-exempt setup, and scheduled delivery available.

Customer Reviews

What customers say about Koch Permanent Stainless Steel Washable Filter (Air or Grease Applications)

Frequently Asked Questions

Answers to the questions we get every day

From sizing and MERV ratings to bulk orders and subscriptions — here's what customers ask before they buy. For product-specific specs, check the description above.

Sizing & fit
How do I know what size filter I need?

The size is printed on the edge of your current filter. Read the nominal size — for example, 16x25x1 — and order that size. The actual filter will measure about 1/2″ less than the nominal size on each dimension. That's industry standard and is how the filter slides into the slot without binding.

If the printed size is worn off, measure the filter slot itself — not the old filter — and round up to the nearest standard size. Our How to Measure guide walks through it step by step.

What if the filter doesn't fit my system?

You're covered by our Filter Fit Guarantee. If the filter doesn't fit your system as expected, contact us within 30 days and we'll make it right — including custom-sized replacements for non-standard slots. One flat $30 fee covers exchanges under the guarantee, and we'll walk through sizing with you so the replacement fits the first time.

Do you offer custom filter sizes?

Custom filters are made to specification down to 1/8″ precision — useful for older homes, clinical spaces, schools, and commercial AHUs with non-standard slot dimensions. Available in every MERV rating from 1–4 through 13, plus washable and extended-surface options.

If you don't see your size listed in our standard lineup, contact us or request a quote and we'll confirm what's available in the media and efficiency you need.

MERV & performance
What is a MERV rating and which one do I need?

MERV (Minimum Efficiency Reporting Value) is the industry-standard scale for how effectively a filter captures airborne particles. Higher numbers capture smaller particles. Most homes do well on MERV 8 to MERV 11. MERV 13 is the step up for pets, allergies, or wildfire smoke exposure — if your HVAC system supports it.

The MERV Rating Explained guide has the full breakdown, or take the 60-second MERV quiz for a personalized recommendation.

Will a higher MERV filter hurt my HVAC system?

Not when it's matched properly. Higher MERV filters do add airflow resistance, but most modern furnaces and air handlers handle MERV 11 comfortably, and many support MERV 13 — especially systems with 4″ or deeper media cabinets. The filter slot depth matters as much as the MERV rating.

Older systems (pre-2000) or tight 1″ slots may struggle with MERV 13. If airflow feels weak from vents, the blower sounds strained, or the coil ices up, step back down to MERV 10 or MERV 11. When in doubt, upgrade in steps — MERV 8 → 11 → 13 — and monitor for a cycle before moving up again.

What's the difference between MERV, MPR, and FPR ratings?

MERV is the universal industry standard, published through ASHRAE 52.2 testing and used by HVAC professionals worldwide. MPR (Micro-Particle Rating) is 3M's internal scale for their Filtrete line. FPR (Filter Performance Rating) is Home Depot's proprietary rating for filters sold in their stores.

MPR and FPR roughly correlate to MERV within their own brand lineups, but they aren't directly comparable across retailers. A Filtrete MPR 1900 is roughly MERV 13; an FPR 10 is also roughly MERV 13. Always check the MERV rating for an apples-to-apples comparison.

What is pleated filter media made out of?

Pleated filter media is a synthetic nonwoven fabric — most often polyester, sometimes a cotton-polyester blend — pleated over a supporting frame of galvanized wire or paperboard. The pleats add surface area, and the frame holds them open so the media keeps its shape under airflow.

Shipping & delivery
How fast will my filter ship?

Standard stocked filters ship within 1–2 business days from the warehouse nearest to your shipping address. Most orders arrive in 2–5 business days via UPS or FedEx. Custom-sized filters are made to order and have their own production lead time listed in the product description.

Current production and shipping timelines are always live on our production schedule page.

Do you ship to Alaska, Hawaii, or PO boxes?

We ship to Alaska and Hawaii — shipping is calculated at checkout based on the address. Free shipping on orders $50+ applies to the lower 48 contiguous states only; AK and HI orders ship at carrier rates.

PO boxes cannot be accepted. Filter boxes are physically oversized and our carriers (UPS and FedEx) won't deliver to PO boxes at this size. You'll need a street address, business address, or pickup location for delivery.

Orders, returns & subscriptions
Can I return or exchange a filter I don't need?

Unopened stocked filters can be returned within 30 days under our refund policy. Custom-sized filters are made to your specification and aren't returnable unless they arrived damaged or incorrectly sized from us.

If a filter arrives damaged or doesn't match what was ordered, submit a claim and we'll replace it — no back-and-forth.

How does the subscribe & save option work?

Most filters ship on recurring delivery at a 10% discount — cadences from every month through every 6 months, plus an annual option at 5% off. Pick the interval that matches your change-out schedule on the product page, and we'll auto-ship on time with no reordering required.

You're only charged when an order ships, and the discount applies to every delivery — not just the first one.

Can I pause, skip, or change my subscription?

Yes, any time. Pause, skip a delivery, change the cadence, swap the filter, update the shipping address, or cancel entirely — all from your account dashboard. No emails required, no hold times, no cancellation fees. See our subscription policy for the full details.

Bulk, commercial & tax-exempt
Do you offer bulk pricing for schools, clinics, or property managers?

Yes — bulk and volume pricing is available for facilities, multifamily properties, fleets, and any organization ordering in standing rotation. We work with schools, clinics, property management companies, government agencies, and industrial facilities on recurring orders with negotiated pricing.

Request a quote with your filter specs and estimated annual volume, or visit our Commercial Services page to see the full commercial lineup.

Are you set up for tax-exempt and government purchases?

Yes. We work with schools, government agencies, non-profits, and resale-exempt buyers regularly. Submit your certificate through our tax-exempt purchases page and we'll set up your account so future orders ship tax-free with no repeated paperwork. Purchase orders and government procurement are supported for established accounts.

About RememberTheFilter.com
Are these genuine name-brand filters?

Yes. Every filter we stock comes from a manufacturer we've vetted — AAF Flanders, Koch, NaturalAire, PrimeShield, and a short list of others. We don't operate as a marketplace, so there's no third-party seller swapping inventory behind the listing.

If you've had issues with counterfeit or low-quality filters from other sellers, that's one of the reasons customers switch to us. Real brands, same specs every time, same source every time.

How do I reach your team if I have a question about a specific filter?

Call 866-469-8556 Monday–Friday, 6 AM – 5 PM PST. Text 425-515-2727 anytime — we reply next business day. Email support@rememberthefilter.com for written support, including tax-exempt setup, bulk orders, and order status.

Full options — including claims, price match, and quote requests — live on our contact page.

Need Help Choosing?

Not sure if Koch Permanent Stainless Steel Washable Filter (Air or Grease Applications) is right for your system?

Call, text, or email our team. We've been sizing and spec'ing filters for homes and facilities for twenty years.