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MACT
Maximum Achievable Control Technology.

MAGNEHELIC GAUGE
An instrument used to measure the differential pressure drop in a baghouse.

MANOMETER
A U-shaped tube filled with the specific liquid. The difference in height between the liquid in each leg of the tube gives directly the difference in pressure on each leg of the tube. Used to monitor differential pressure.

MANUAL POWER SUPPLY CONTROL
The manual regulation of high voltage power based on precipitator operating conditions observed by plant operators.

MARKERS
Those marks on a pattern to denote a specific item such as a ring cover or cuff turn back line.

MAXIMUM OPERATING TEMPERATURE
Continuous operating temperature at which fabric will perform without deteriorating prematurely.

MEDIA
The filter material through which air or fluid passes in the process of filtration and which retains particles.

MICROMETER
See MICRON.

MICRON
A unit of length, 1/1000 of one millimeter (1/24,000 of an inch) used as a measurement of the largest diameter of a particle; 74 microns are equal to a 200 mesh opening.

MICRON RATING
The smallest size of particles a filter can remove.

MIGRATION VELOCITY
A parameter in the Deutsch-Anderson equation used to determine the required size of an electrostatic precipitator to meet specified design conditions. Values are generally stated in terms of ft/min. or cm/sec. (see Effective Migration Velocity).

MIT FLEX
A test whereby a filter media specimen is rapidly flexed in an arc under a specified load until fabric rupture occurs. Test conditions are usually: 270° arc, 180 cycles/minute, 4-pound load, 1/2-inch width specimen.

MONOFILAMENT
A single filament made from man-made fibers such as acetate, rayon, nylon, polyester, acrylic, etc.

MULLEN BURST TEST
A measurement of force needed to burst a given area of paper or cloth under fluid flow conditions, expressed as the pressure per square inch that will burst a 2" diameter test specimen.

MULTIFILAMENT
A yarn consisting of many continuous filaments or strands; opposite of monofilament, or single strand.