AAF AmerKool M81 Gas Turbine Demister Coalescing Pad 25" x 25" x 3" – Moisture / Mist Eliminator
The AAF AmerKool M81 demister coalescing pad is a heavy-duty, highly efficient mist eliminator designed for gas turbine air intake systems already equipped with metal holding frames or AAF RenuFilter retaining frames. This 25" x 25" x 3" (635 x 635 x 75mm) pad is built from a 75mm (3 inch) thick blanket of continuous filament glass fibers treated with a water-resistant binder applied during the glass-spinning process, letting the media retain its thickness and resiliency even when fully saturated.
The M81 uses a two-stage density construction — an open weave on the air-entering side and a tighter weave on the air-leaving side — which uses the full depth of the pad to maximize water-holding capacity. It is typically installed behind a weatherhood for moderate moisture conditions or behind a 2.5-pass weather louver for heavy moisture conditions such as coastal fog, frequent rain, or air-washer discharge, and operates at low pressure drop for long service life.
Technical Specifications
| Filter Style | Demister / Coalescing Pad |
| Nominal Size | 25" x 25" x 3" |
| Actual Size | 635 x 635 x 75mm |
| Media Grade | M81 |
| Media Thickness | 75 mm (3 in) |
| Rated Air Velocity | Up to 4 m/s |
| Color (air-leaving side) | Gold with blue tint |
| Compatible Turbines | Universal — GE, Siemens, MHI, Solar, P&W, Kawasaki frames |
| Housing Compatibility | AAF metal holding frames and RenuFilter retaining frames; weatherhood or 2.5-pass weather louver configurations |
Cross-Reference
Comparable in function to demister/coalescing pads used in two-stage and weather-louver gas turbine intake configurations from Donaldson and Farr/Camfil. There is currently no direct demister-pad equivalent in the Koch Filter catalog on this site, making the AmerKool M81 the primary moisture-removal option in our Gas Turbine Air Filters category.
| Specification | Value |
|---|---|
| Filter Style | Demister / Coalescing Pad |
| Media Grade | M81 |
| Compatible Turbines | Universal |
| Housing Compatibility | AAF |