DC Fans

Pelonis Technologies Inc. offers advanced designs in DC fans that provide exceptional quality and high performance. PTI DC fans are known for their reliable, quiet and cost-effective capabilities that function best under a low-pressure environment. DC fans offer an additional advantage of a long life span since a DC fan can consume up to 60 percent less power than other fans.

DC fans are directly proportional to voltage which lets them run at the necessary speed for optimum cooling. Various Fans-Tech products are available in a variety of voltages, are RoHS compliant, and are manufactured in accordance with internationally recognized standards for maximum safety. PTI offers a wide array of DC centrifugal fans, axial fans, inline duct and box fans.

DC Fan Series Application Guide

Fan Series Fan Sizes Applications
C series
C Series
25mm to 92mm
(0.98 to 3.62in)
For standard applications requiring small fan sizes up to 92mm. Available with multiple features, including auto restart, tachometer, and rotation detection. 5V, 12V, or 24V.
D Series
D Series
40mm to 92mm
(2.36 to 4.72in)
For standard applications requiring higher airflow in fan sizes up to 92mm. Available with multiple features for improved fan operation and performance including Pulse Width Modulation (PWM). 5V, 12V, 24V, or 48V.
R Series
R Series
60mm to 120mm
(1.57 to 3.62in)
For sensitive applications requiring fan sizes up to 120mm with LOW POWER consumption. Energy efficient DIFFERENTIAL 4-switch circuit design reduces voltage spikes and provides smooth and efficient operation. Available with multiple features, including Pulse Width Modulation (PWM). 24V or 48V.
G Series
G Series
92mm to 172mm
(1.57 to 6.77in)
For demanding applications requiring higher airflow in fan sizes up to 172mm with HIGH AIRFLOW - HIGH PRESSURE - LOW POWER consumption. Available with multiple features for improved fan operation and performance. 24V or 48V.
P Series
P Series
92mm to 172mm
(1.57 to 6.77in)
For demanding applications requiring higher airflow in fan sizes up to 172mm with HIGH AIRFLOW - HIGH PRESSURE - LOW POWER consumption. Available features include Advanced Pulse Width Modulation (PWM) and extra fan features for improved efficiency and performance. 12V, 24V, or 48V.
K Serie
K Series
25mm to 92mm
(0.98 to 3.62in)
For very demanding applications in 120mm fan sizes requiring higher performance with EXTRA HIGH AIRFLOW and EXTRA HIGH PRESSURE. Available features include Advanced Pulse Width Modulation (PWM) and extra fan features for maximum performance and efficiency. 12V, 24V, or 48V.

Intelligent Motion Controls

Download Our Free Intelligent Motion Controls eBook Intelligent Motion Controls are additional features that can be added to select DC fans to help improve performance and efficiency.  Various controls include Tachometer, Rotation Detection, PWM speed control, Life Detection, and others.

This guide serves to educate end users on not only the engineering “how” of DC Fan intelligent motion controls, but also the “why,” including operating
efficiency suitable for green applications, as well as improved system
performance, reliability and life expectancy.

 

 

DC Fans Selection Guide

Size: Inches Size: MM CFM m3/min inH2O mmAq dBA
0.98 x 0.39 25 x 10 1.4 - 2.9 0.039 - 0.083 0.078 - 0.315 1.98 - 8.00 18 - 34
1.18 x 0.39 30 x 10 2.7 - 4.2 0.075 - 0.120 0.086 - 0.229 2.19 - 5.82 18 - 29
1.57 x 0.39 40 x 10 3.9 - 8.0 0.110 - 0.227 0.068 - 0.266 1.73 - 6.75 19 - 37
1.57 x 0.79 40 x 20 4.9 - 10.9 0.139 - 0.308 0.094 - 0.342 2.40 - 5.74 21 - 32
1.57 x 1.10 40 x 28 8.3 - 24.8 0.236 - 0.703 0.154 - 1.291 3.91 - 32.79 32 - 61
1.97 x 0.39 50 x 10 8.1 - 15.7 0.230 - 0.446 0.070 - 0.279 1.78 - 7.09 26 - 40
1.97 x 0.57 50 x 15 9.9 - 15.5 0.280 - 0.438 0.097 - 0.274 0.054 - 0.121 26 - 39
2.36 x 0.39 60 x 10 11.3 - 17.5 0.318 - 0.497 0.054 - 0.121 0.054 - 0.121 25 - 35
2.36 x 0.79 60 x 20 13.8 - 33.3 0.391 - 0.944 0.109 - 0.606 0.109 - 0.606 25 - 47
2.36 x 0.98 60 x 25 15.1 - 32.6 0.426 - 0.923 0.129 - 0.576 0.129 - 0.576 26 - 46
2.76 x 0.98 70 x 25 19.5 - 35.8 0.551 - 1.012 0.074 - 0.246 0.074 - 0.246 25 - 41
3.15 x 0.59 80 x 15 24.5 - 40.7 0.692 - 1.152 0.072 - 0.198 0.072 - 0.198 27 - 40
3.15 x 0.98 80 x 25 26.6 - 53.7 0.754 - 1.521 0.074 - 0.286 0.074 - 0.286 24 - 41
3.62 x 0.98 92 x 25 40.4 - 77.0 1.145 - 2.180 0.095 - 0.338 0.095 - 0.338 28 - 46
3.62 x 1.26 92 x 32 50.5 - 86.1 1.429 - 2.437 0.157 - 0.458 0.157 - 0.458 32 - 45
4.72 x 0.98 120 x 25 78.2 - 176.8 2.213 - 5.005 0.207 - 0.976 0.207 - 0.976 37 - 58
4.72 x 1.26 120 x 32 80.9 - 239.9 2.293 - 6.794 0.247 - 1.229 0.247 - 1.229 37 - 65
4.72 x 1.50 120 x 38 104.5 - 236.8 2.958 - 6.706 0.286 - 1.239 0.286 - 1.239 40 - 65
6.77 x 2.00 172 x 51 185.9 - 372.8 5.236 - 10.555 0.275 - 1.272 0.275 - 1.272 47 - 66

The following points should be considered when selecting a cooling fan:

  • Determine the amount of heat generated inside the equipment.
  • From the equipment manufacturer's data, find the maximum permissible equipment temperature.
  • Calculate the air volume necessary from the equation.
  • Select the fan from the performance curves shown inthe fan specification sheets. The volume of airflow required to cool the equipment can be determined if the internal heat dissipation and the total allowable temperature rise are known.

The basic heat transfer equation is:

Q = Cp x W x T

Where:

Q = Amount of heat transferred
Cp = Specific heat of air
T = Temperature rise within the cabinet
W = Mass flow = CFM x D
(Where: D = Air Density and CFM is cubic feet / min)
By substitution, we obtain:
Air Flow in CFM = Q / Cp x D x T

Then, we get the following equations:

Air Flow in CFM = 3.16 x P / Tf = 1.76 x P / Tc

Air Flow in m3/min = 0.09 x P / Tf = 0.05 x P / Tc

P : Internal power dissipation in watts
Tf : Allowable temperature rise in °F
Tc : Allowable temperature rise in °C
T : T2 - T1
T1: Incoming airflow temperature
T2: Outgoing airflow temperature
T1: Incoming airflow temperature
T2: Outgoing airflow temperature
1 m3 / min = 35.325 CFM (Cubic Feet / min)

Cooling of Heat Generating Equipment

Example 1: If internal power dissipation is 1500W and T is 50°F

Air Flow in CFM = 3.16 x 1500 / 50 = 94.8 CFM (or 2.68 m3/min

Example 2: If internal power dissipation is 1000W and T is 20°C

Air Flow in CFM = 0.05 x 1000 / 20 = 2.5 m3/min (or 88.3 CFM)