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TECHNICAL DATASTANDARD GAUGE EQUIVALENCYDETERMINE THE RIGHT HEATER SIZE FOR YOUR NEEDS850exmweb.com | 1-800-363-2423 | [email protected] selectionThe wattage requirement is determined from a consideration of the surface area, insulation properties of the enclosure, the temperature difference between the ambient and the enclosure and the heating power generated by existing components (e.g. transformer). The following formula can generally be used to calculate wattage requirements for uninsulated enclosures : Ph = ( A X T X k ) - Pv Ph = Required heating power for your application in Watts (W) Pv = Heating power generated by existing components in Watts A = Exposed enclosure surface area in square meters (m2) /\\T = Temperature differential between the desired minimum interior temperature and the lowest possible external temperature of the enclosure in Kelvin (K). 1.8%u00b0F = 1%u00b0C = 1K k = Heat transmission coefficient of the enclosure material used : Painted steel : 5.5W/m2K Stainless steel : 3.7W/m2K Aluminum : 12W/m2K Plastic : 3.5W/m2KFor outdoor applications, it is recommended to double the heating power. This formula is supplied for reference purposes only. EXM offers no warranty, expressed nor implied, as to the application of this table in different environments, as the equipment may be subjected to conditions out of our control.Hot or cold rolled steel gauge Equivalent thickness in inches Equivalent thickness in millimeters7 gauge ~ 0.179 ~ 4.5478 gauge ~ 0.164 ~ 4.1669 gauge ~ 0.150 ~ 3.81010 gauge ~ 0.134 ~ 3.40411 gauge ~ 0.120 ~ 3.04812 gauge ~ 0.105 ~ 2.66713 gauge ~ 0.090 ~ 2.28614 gauge ~ 0.075 ~ 1.90515 gauge ~ 0.067 ~ 1.70216 gauge ~ 0.060 ~ 1.52417 gauge ~ 0.054 ~ 1.37218 gauge ~ 0.048 ~ 1.21919 gauge ~ 0.042 ~ 1.06720 gauge ~ 0.036 ~ 0.91421 gauge ~ 0.033 ~ 0.83822 gauge ~ 0.030 ~ 0.762