Determining Requirements for Sizing Correct Cabinet Cooler

  1. Size the heat load area of the cabinet using the following formula:
    (2 * W + 2 * D) Height = square feet of cabinet
    Example: 3' wide, 1' deep, 4' high = 32 square feet
  2. Determine inside temperature reading for maximum hotter outside temperatures:
    Example: If reading is taken on a 70°F day and the temperature reads 110°F, add 25°F if the electronics will be operating during a summer day temperature of 95°F or add more if it will get hotter.
  3. 90°F (32°C) is a safe operating temperature for most electronics to reduce heat stress on the controls and drying of the wafer boards.
  4. Subtract the temperature of 90°F as the desired temperature inside the cabinet from the temperature reading in step 2 to determine the temperature difference, or Delta T.
  5. Use the square area of your cabinet readings on the left side of the scale and match it with the temperature difference from step 4 on the top of the sizing chart.
  6. The intersection of these two numbers give you the BTUs required to maintain the desired 90°F inside temperature.
  7. Match the BTU reading with the proper AiRTX Cooler.
Sizing Chart BTU Requirements for Cooling
Inside temperature drop needed to safe 90°F (32°C)
Cabinet size Sq Ft 90°F 70°F 50°F 30°F 10°F
2' H x 2' W x 2' D 16 500 350 150 50 50
3' H x 3' W x 2' D 30 1100 800 450 150 100  
4' H x 3' W x 1' D 32 1300 900 550 150 100
5' H x 3' W x 1' D 40 1600 1100 700 150 100
5' H x 4' W x 1' D 50 2200 1400 900 300 150
5' H x 4' W x 2' D 60 2600 1800 1100 500 200
5' H x 5' W x 2' D 70 3000 2100 1300 600 200
6' H x 4' W x 2' D 72 3100 2200 1400 700 200
6' H x 5' W x 2' D 84 3600 2600 1600 750 200
6' H x 6' W x 2' D 96 4200 3000 1900 900 200
7' H x 6' W x 2' D 112 4800 3500 2200 1000 200
7' H x 7' W x 2' D 126 5800 4100 2600 1300 250
8' H x 7' W x 8' D 144 6500 4600 2900 1450 300
8' H x 8' W x 2' D 160 7000 5200 3300 1650 350
8' H x 10' W x 2' D 192 8800 6400 5200 2100 450
Square meters 50°C 39° 28°C 17°C 6°C
1.49 126 88 38 13 13
2.79 280 202 113 38 25
2.97 330 227 139 38 25
3.72 405 280 176 38 25
4.65 555 353 227 75 38
5.6 655 454 280 126 50
6.50 756 530 328 151 50
6.69 781 555 353 176 50
7.80 907 655 403 189 50
8.92 1058 756 480 227 50
10.40 1210 882 554 252 50
11.71 1462 1033 655 328 63
13.38 1638 1159 730 365 76
14.86 1764 1310 832 416 88
17.84 2218 1612 1310 530 113
  600 BTU/H Model 70008, 70108, 70308
  1100 BTU/H Model 70015, 70115, 70315
  1800 BTU/H Model 70025, 70125, 70235
  2500 BTU/H Model 70035, 70135, 70335,
  5000 BTU/H Model 70070, 70170, 70370