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Cabinet Cooler Sizing

Determining Requirements for Sizing Correct Cabinet Cooler

  1. Size the heat load area of the cabinet using the following formula:
    (2 x W + 2 x 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 70F day and the temperature reads 110F, add 25F if the electronics will be operating during a summer day temperature of 95F or add more if it will get hotter.

  3. 90F (32C) 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 90F 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 90F inside temperature.

  7. Match the BTU reading with the proper AiRTX Cooler.

Sizing Chart
BTU Requirements for Cooling
Inside temperature drop needed
to safe 90F (32C)
Cabinet size Sq Ft 90F 70F 50F 30F 10F
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
NEMA Type 4,12 NEMA Type 12,4x NEMA Type 4,12
Alum SS SS Description
75008 70008x 70008 600 BTU/H Cooler and ducting kit, muffler
75108 70108x 70108 600 BTU/H Cooler and ducting kit, muffler and 5 micro auto drain filter
75308 70308x 70308 600 BTU/H thermostatic system includes: Cooler, auto drain filter, ducting kit, muffler, thermostat, solenoid valve
75105 70105x 70105 1100 BTU/H Cooler and ducting kit, muffler
75115 70115x 70115 1100 BTU/H Cooler and ducting kit, muffler and 5 micro auto drain filter
75315 70315x 70315 1100 BTU/H thermostatic system includes: Cooler, auto drain filter, ducting kit, muffler, thermostat, solenoid valve
75025 70025x 70025 1800 BTU/H Cooler and ducting kit, muffler
75125 70125x 70125 1800 BTU/H Cooler and ducting kit, muffler and 5 micro auto drain filter
75325 70325x 70325 1800 BTU/H thermostatic system includes: Cooler, auto drain filter, ducting kit, muffler, thermostat, solenoid valve
75035 70035x 70035 2800 BTU/H Cooler and ducting kit, muffler
75135 70135x 70135 2800 BTU/H Cooler and ducting kit, muffler and 5 micro auto drain filter
75335 70335x 70335 2800 BTU/H thermostatic system includes: Cooler, auto drain filter, ducting kit, muffler, thermostat, solenoid valve
75370 70370x 70370 5600 BTU/H thermostatic system includes: 2 Coolers (model 70035), auto drain filter, ducting kit, muffler, thermostat, solenoid valve

Square meters 50C 39 28C 17C 6C
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