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BETE Fog Nozzle, Inc., one of the world's leading spray nozzle manufacturers, designs and manufactures
the highest quality Industrial Spray Nozzles

Application Intake Sheets


Humidify air in ducts, drying kilns, curing rooms, greenhouses, and other open areas; area Misting

Humidification by Spray Nozzle Process:

In many industrial processes, commercial processes, and agricultural settings it is necessary or advantageous to increase the water content of the air in a duct, chamber, or room. Spray nozzles which make very small droplets are effective at increasing the amount of water that is present in the air. For reducing the temperature of a hot gas by evaporating water into it, please see Gas Cooling.

Humidity is a measure of how much water vapor is present in air. The volume of water vapor that can be held in air varies strongly with temperature; warm air can hold more water vapor than cold air. Simply speaking, relative humidity is the ratio of the amount of water vapor in the air to the amount of water vapor that could be held by the air at that temperature. Technically, relative humidity is the ratio of partial pressure due to water vapor to the saturation vapor pressure, multiplied by 100%.

Nozzles used as humidifiers work by creating very small water droplets and projecting them into the air. The very small droplet size allows it to evaporate quickly even at normal ambient temperatures. This evaporated water increases the humidity level of the air. Typically a relatively small amount of water is evaporated to increase the relative humidity and this small amount of water does not appreciably affect the temperature of the air. When changing the humidity level considerably, the temperature may change by several degrees. Our engineers can help you through the psychrometric calculations to achieve your process needs.

Humidification Nozzle Recommendations:

For normal ambient temperatures and slow moving air, such as humidification of a room, one of the best nozzles to select is the XAAD which uses compressed air to atomize the water into very fine drops. Typical pressures for the XAAD are 10-60 psi water and 10-100 psi air. If compressed air is not available or desired, using a MicroWhirl or PJ at high pressure (100 to 1000 psi) is also effective. If humidifying a large amount of air or if the air is at elevated temperatures, higher flow direct pressure nozzles like the L or TF may be suitable.

When humidifying a room or area Misting, spacing nozzles evenly is important. To humidify a gas stream, mounting nozzle heads 5-6 inches apart is normally recommended. When humidifying a room, a review of the air flow through the room can help to decide where to place the nozzles.

For most applications, Stainless Steel nozzles work best. An advantage of the XA series Air Atomizing nozzle is that is can be supplied with a built-in pneumatic shutoff. Combining this shutoff with a humidistat, a solenoid valve, and some tubing, a simple humidity control system can easily be created.

Our experienced engineers can determine which nozzle is best for your application.

Humidification Nozzle Common Uses/Installations:

Humidification nozzles are used to moisten air in ducts, keep an even humidity in drying kilns, achieve a high relative humidity in curing rooms and greenhouses, keep the humidity constant in baking operations, and any other application where humidity is critical to the process.

Typical operating conditions for this application are listed for each nozzle

40-100 psi
5.5-14 bar
0.28-3.83 gpm
1.5-13 L/min

100-3000 psi
7-200 bar
0.009-0.151 gpm
0.032-0.517 L/min

100-2000 psi
4-14 bar
0.036-1 gpm
0.5-2.4 L/min

40-100 psi
4-7 bar
0.25-10 gpm
1.1-57 L/min
71-186 scfm
59-225 Nm³/h

30-80 psi
5.5-14 bar
1.2-11.4 gpm
7-23 L/min
Hollow Cone

40-100 psi
2-4 bar
0-100 gph
1.5-113 L/h
0.6-17 scfm
1-27 Nm³/h



Industrial Spray Nozzle Applications