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H

HEADER
A pressurized pipe that contains the compressed air supply for a pulse type baghouse.

HEAT SET FINISH
Heat finishing treatment that will stabilize many man-made fibers so that there will be minimal change in shape or size.

HEAT STABILIZED
A term to describe fiber or yarn heat-treated to reduce the tendency of the fiber to shrink or elongate under load at elevated temperature.

HEPA
High Efficiency Particulate Air.

HOOD
The component of a system that captures heated air/gases, smoke and particulate; located at pickup point (see CANOPY).

HOPPER (BAGHOUSE)
Dust collector section located below tubesheet and under bags. It is utilized for accumulation of dust dropout from the incoming air stream and from the filter after cleaning.

HOPPER CAPACITY
The total capacity of a hopper measured from a point 10" below the high voltage system or plates, whichever is lower.

HOPPER LEVEL DETECTOR
An instrument that is mounted on the side walls of the hopper and provides an early warning of solids overflow.

HUMIDITY, ABSOLUTE
The weight of water vapor per unit volume, pounds per cubic foot or grams per cubic centimenter.

HUMIDITY, RELATIVE
The ratio of the actual partial pressure of the water vapor in a space to the saturation pressure of pure water at the same temperature.

HYDROCARBON
A chemical compound containing only molecules of carbon and hydrogen.

HYDROLYSIS
A chemical reaction in which water reacts with another substance, either dust or the filter media, breaking the chemical links and creating two or more substances. The presence of water in a baghouse is a significant detriment to the filter media... more.

HYDROPHILIC
Water-loving. Easily wetted with water.

HYDROPHOBIC
Water-aversive. Not easily wetted with water.