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 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.