Koch SPT-550 (1" Antimicrobial, Dual-Density, Tackified) Synthetic Bulk Roll - 90 ft, MERV 8

The Koch Type SPT-550 Synthetic Bulk Roll is a 90-foot roll of airlayed polyester filter media, sized for cut-to-size installations and large-area filtration where pre-cut pads aren't practical. The media is constructed at 1″ nominal loft, 9.0 oz/sq yd weight, all white antimicrobial color, tackified (dry adhesive treatment for enhanced dust holding), dual-density (progressively dense, with denser fibers downstream), antimicrobial treatment, delivering ~MERV 8 efficiency per ASHRAE 52.2. Specified for healthcare, food processing, and institutional facilities where antimicrobial treatment is required alongside MERV 8 capture, including cut-to-size facility installations.

What you get: one bulk roll, cut to size on your end

Each variant on this page is one single bulk roll — not a case or pack. The variant price is the per-roll price for one 90-foot roll at the selected width. Cut the roll to your needed sizes on-site with a sharp utility knife; the airlayed polyester media trims cleanly. Available widths and lengths:

• 20" x 90 ft — ~150.0 sq ft of media per roll
• 25" x 90 ft — ~187.5 sq ft of media per roll
• 40" x 90 ft — ~300.0 sq ft of media per roll
• 50" x 90 ft — ~375.0 sq ft of media per roll
• 60" x 90 ft — ~450.0 sq ft of media per roll

Need a custom width, custom length, or facility-scale order? Request a quote with your exact requirements and we can work out the pricing.

Where bulk rolls are used

Bulk rolls let the customer cut the media to fit non-standard sizes, large-area installations, or custom pad frames. Common applications:

• Custom-cut pad frames — non-standard frame dimensions where pre-cut pads don't exist
• Large-area blanket installations — cut a continuous run of media to fit a long retention rack
• Pad rack systems with mixed sizes — one roll covers multiple frame sizes when cut on-site
• Facility-scale changeouts — bulk roll is more economical than equivalent square footage of pre-cut pads for high-volume buyers
• Industrial and OEM applications — equipment manufacturers cut media to fit their own product lines
• Pre-filter inlet hoods and AHU pre-screens — cut to fit irregular openings

Same media as Koch pre-cut pads

This bulk roll uses the same Koch Type SPT-550 airlayed polyester media as the pre-cut pad version of this product. Same ~MERV 8 efficiency, same construction, same arrestance and dust holding profile — the difference is form factor.

Choose bulk rolls when you need cut-to-size flexibility, large-area continuous installations, facility-scale economics, or non-standard dimensions. Choose pre-cut pads when you have standard HVAC frame sizes (16x20, 16x25, 20x20, 20x25, 24x24) and prefer ready-to-install pieces. The pre-cut pad version of SPT-550 is available here.

Type SPT-550 construction and specifications

• Media: Airlayed polyester synthetic fibers
• Nominal loft: 1″ (1.00″)
• Weight: 9.0 oz per square yard
• Color: All white antimicrobial
• Roll length: 90 feet
• Available widths: 20″, 25″, 40″, 50″, 60″
• Tackifier: Dry tackifier treatment (downstream side, blue-tinted) for enhanced dust holding
• Density: Dual-density / progressively dense construction (denser fibers downstream for graduated capture)
• Antimicrobial: Yes — treated to inhibit microbial growth on the media surface, suited to healthcare, food processing, and institutional environments
• Initial pressure drop: 0.14″ w.g. at design air velocity
• Average arrestance: 86% per ASHRAE 52.1
• Dust holding capacity: 225 grams per square yard
• MERV rating: 8 per ASHRAE 52.2
• Reference bulletin: Koch PB-001-B

When the SPT-550 bulk roll is specified

• Healthcare and clinical environments where antimicrobial media is required by facility specification at large scale
• Food processing and pharmaceutical facilities with custom pad frame requirements for antimicrobial media
• Institutional buildings — senior living, schools, university dorms with respiratory health priorities
• HVAC pad frames in damp climates where antimicrobial treatment helps inhibit microbial growth, sized to facility-specific frame dimensions

What MERV 8 captures

Captures dust mite debris, pollen, mold spores, pet dander, and most household and office airborne dust. Standard high-efficiency target for commercial HVAC and a reliable final-stage choice in pad frame and bulk-roll installations.

Choosing across the Koch synthetic bulk roll line

Koch offers six bulk roll media types in 5 standard widths each. Match the loft, tackifier, and density to your application:

• SS5 (MERV 4): standard 1/2 inch dry roll, prefilter applications
• SS10 (MERV 5): 1 inch dry roll, versatile 2 inch frame and blanket use
• SPT5 (MERV 4): tackified 1/2 inch roll, upgraded dust holding
• SPT10 (MERV 7): tackified 1 inch roll, broad commercial use
• SPT-30 (MERV 8): dual-density 2 inch tackified roll, highest SPT capture
• SPT-550 (this product) (MERV 8): antimicrobial 1 inch dual-density roll, healthcare and food

For applications requiring antimicrobial treatment, only the SPT-550 carries that specification. For higher-loft 2-inch frame applications, choose SPT-30. For dry-construction requirements (food processing, no-tackifier specs), choose SS5 or SS10.

Sizing and ordering notes

• Each variant is one 90-foot roll. Order multiple rolls by adjusting the quantity at checkout. The variant price is the per-roll price.
• Cut to size on-site. Airlayed polyester trims cleanly with a sharp utility knife. Plan your cuts to minimize waste — rolls cannot be re-spliced once cut.
• Available widths: 20″, 25″, 40″, 50″, 60″. Custom widths and lengths available by quote.
• Heavier widths ship one roll per carton. 40″, 50″, and 60″ rolls are oversized and ship individually. 20″ and 25″ widths can be combined in a single shipping carton when stocked together.
• Frames sold separately. Bulk rolls are the filter media — they require pad frames, retention grids, or pad rack systems to install in the air handler. Contact us for compatible frame and rack options.
• Pre-cut pad version available. If you need standard 16x20, 16x25, 20x20, 20x25, or 24x24 sizes, the pre-cut pad version of SPT-550 ships in case packs here.