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How to determine the BTU exhausted for Juniper firewall devices

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Article ID: KB12103 KB Last Updated: 11 Aug 2010Version: 3.0
Summary:
This article shows how to calculate the BTU for Juniper Firewall Devices from known specifications in the Juniper data sheets.
Symptoms:
How can I tell what the BTU's are for Juniper firewall devices?   Some of the data sheets do not specify the BTU measurements.
Solution:
First confirm if the BTU is posted in the Firewall/IPSec VPN Specifications and Datasheets.  If it is not posted, a conversion of Watts to BTU is done as follows:
Kilowatt /hour (1000 watts)  = 3,413 BTU/ hour
Watts/hour  = 3.413 BUT/hour
Watts x 3.413 = BTU
The datasheets publish the watt specifications, so the BTU can be calculated using the above formula.

For example:
The NetScreen-204 and NetScreen-208 normal working status or average power consumption is roughly 30 Watts. The AC power supply output capacity is 45 Watts. Peak consumption and current on boot up is 20 A Max at 120 VAC, and 40 A Max at 240 VAC.

45 watts = 154 BTU         (45 watts x 3.413 = 154 BTU)
30 watts = 102 BTU         (30 watts x 3.413 = 102 BTU)
20 watts =  68  BTU         (20 watts x 3.413 = 68 BTU)

normal = 102.39 BTU max = 153.585 BTU, using 30 Watts and 45 Watts respectfully. 
This is based on published watt specifications from the Juniper datasheet for the device.
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