Koch Multi-Sak MERV 14 Extended Surface Bag Filter – 24x24x15 Inches (Pack of 3)

Description

This 24″ × 24″ × 15″ Koch Multi-Sak Microfiberglass Extended Surface Bag filter (part number 219-112-115) is a commercial extended-surface bag filter rated MERV 14, designed for commercial and industrial air handlers operating at face velocities from 500 to 3000 CFM.

What makes a bag filter different

Extended-surface bag (or pocket) filters use multiple deep media pockets instead of a flat pleated pack. The result is dramatically more filter surface area in the same footprint — typically 10–20× what a panel filter provides — which means higher dust-holding capacity, longer service life, and lower average pressure drop. They’re the workhorse filter in most large commercial air handlers.

Media and construction

• Media: Microfiberglass bag media for high-efficiency MERV 11–14 performance. Progressively loaded from upstream to downstream for balanced dust capture.
• Pocket construction: Rigid support members maintain pocket shape through the filter’s service life, preventing collapse under loading.
• Frame: Galvanized steel header (single or double) for standard side-access housings.
• Rating: MERV 14 per ASHRAE 52.2.

What MERV 14 captures

Sub-micron particles including most smoke and bacteria-sized particles. MERV 14 is a commercial-grade filtration tier, typically used as final filter in commercial air handlers or as a high-efficiency upgrade in facilities with dedicated high-MERV systems. Standard residential HVAC equipment is rarely rated for MERV 14 static pressure.

Typical applications

Commercial office-building air handlers, school HVAC, retail, hospitality, light industrial ventilation, and as high-efficiency final filters in multi-stage systems.

Also worth considering

Shopping on price? Our house brand PrimeShield Elite (MERV 13) covers the same efficiency tier across common residential and commercial sizes and is usually the better value. Choose this branded option when your equipment spec sheet or facilities team calls for it specifically.

Questions on fit, quantity, or a commercial quote?

Need a size that isn’t listed, a different pack count, or a quote for a commercial order? Get in touch — we handle facilities and commercial orders daily and can usually match or beat distributor pricing.

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