Category Archives for Ventilation Requirements

Air-Washer Humidifiers

An air washer essentially consists of a row of spray nozzles inside a chamber or casing. Atank at the bottom of the chamber provides for collection of water as it falls through the air and comes into intimate contact with … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: | Leave a comment

HVAC Humidity-Control Methods

Humidifiers, by definition, are devices for adding moisture to the air. Thus, to humidify is to increase the density of water vapor within a given space or room. Air humidification is affected by vaporization of water and always requires heat … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: | Leave a comment

HVAC Filter Installation

Air filters are commonly installed in the outdoor air intake ducts of the air-conditioning system and often in the recirculating air ducts as well. Air filters are logically mounted ahead of heating or cooling coils and other air-conditioning equipment in … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: | Leave a comment

HVAC Wet Filters

The wet (or viscous) filter makes use of an adhesive in which the dust particles are caught and held upon impingement. It also makes use of densely packed layers of viscous-coated metal baffles, screens, sinuous passages, crimped wire, and glass … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: | Leave a comment

HVAC Dry Filters

Dry filters are usually made in standard units of definite rated capacity and resistance to the passage of air. At the time the installation is designed, ample filter area must be included so that the air velocity passing through the … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Filtration Various Dust Sources

The dust removed in the filters may be classified as poisonous, infective, obstructive, or irritating and may originate from an animal, vegetable, mineral, or metallic source. Industry produces many deleterious fumes and dusts, for example, those emanating from grinding, polishing, … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Filtration Effect of Dust on Health

The effect of dust on health has been properly emphasized by competent medical authorities. The normal human breathes about 17 times a minute. The air taken into the lungs may contain large quantities of dust, soot, germs, bacteria, and other … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: | Leave a comment

HVAC Ventilation Duct-System Resistance

Air ducts may be designed with either a round or a rectangular cross section. The radius of elbows should preferably be at least 1.5 times the pipe diameter for round pipes, or the equivalent round pipe size in the case … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Ventilation Volume of Air Required

The volume of air required is determined by the size of the space to be ventilated and the number of times per hour that the air in the space is to be changed. In many cases, existing local regulations or … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Mechanical Ventilation

Mechanical ventilation differs from natural ventilation mainly in that the air circulation is performed by mechanical means (such as fans or blowers). In natural ventilation, the air is caused to move by natural forces. In mechanical ventilation, the required air … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: | Leave a comment

← Older posts

Newer posts →