Author details

Bag filter is a widespread device for cleaning of the air. It is an apparatus for separating air from fine dust and constituting essentially of a canvas cloth through which dust-laden air is forced or driven by pressure of suction leaving dust particles on the outside of the canvas. It is equipped with a shaker device to regularly clean the canvas. To improve the removal of dust from the canvas filter, the shaker may be assisted by back-flushing, i.e., blowing clean air through the canvas from the inside. Baghouse filters produce a high degree cleaning (99%) when catching dust particles sized from 0.3 to 4 μm. Their disadvantages include large dimensions need for frequent removal of the collected dust and filter cleaning for, as the cloth

To clean the plenum air from fine dust, ventilation systems employ air cleaners with paper filters. The filtering medium is pure cellulose made in the form of very thin layers of crimp paper and packed into stacks of a definite thickness. Filter paper for quantitative purposes is treated with acids to remove all or most inorganic substances. The disadvantages of paper filters are relatively high resistance to airstream and frequent need for changing the filter paper stacks. Besides, paper filters are impracticable for high concentrations of dust as their resistance to the air passes increases, and this demands for immediate replacement as it reaches 120–150 Pa.

Electrical precipitators are dust collectors in which the process of dust separation is affected by an electrical precipitation plant using a unidirectional electric field in which airborne dust particles are attracted to, and collected on, the positive electrode from which dust is shaken off into a dust bunker. These are also called electrostatic precipitators whose separation efficiency for fine dust is 95–99%. The choice of a filter or dust arrester is based largely on the required degree of

Pollutants of industrial indoor environment, along with importance of indoor air quality and health are elaborated in detail. The noise calculation charts are provided for interference of noise waves based on a benchmark solution. The grades and flag colors are notated to the noise calculation charts. Noise characterization calculations for indoor environment are presented using devised noise measurement equations. Indoor air quality and noise instrumentation based on source of noise are correlated and discussed. Effects of pollutants on human health are summarized. Human noise behavior along with psychophysiological measurements is briefly discussed. Ventilation systems along with air cleaning equipment for industrial indoor environment

cleaning, content of dust in the dust-laden air, nature of dust and size of dust particles, efficiency and pressure of the ventilating unit, resistance and capacity of the dust separator. The physical properties of dust are also important. Thus, inertiatype de-dusters and baghouse filters are ineffective for sticky moist or fibrous kind of dust. Dust collectors, cyclones or electrical precipitators are usually ineffective for dusts in which the vast majority of particles are less than 10 μm in size. Content of dust suspended in the air is also important for choosing an air cleaner of a suitable

resistance of the filter increases, its capacity lowers.

Indoor Environment and Health

The efficiency for fine dust separation is 92–95%.

type and capacity.

6. Conclusion

are discussed in detail.

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Himanshu Dehra Egis India Consulting Engineers Pvt Ltd., Gurugram, Haryana, India

\*Address all correspondence to: anshu\_dehra@hotmail.com

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
