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HVAC and Fire Fighting
Watch this ....Fire Fighting Webinar...i think its help full.
https://www.youtube.com/watch?v=5x0Tz-1zSOw&index=1&list=PLgwFrn4WS09Fx2-3l2xD55eLFmyVREVLe&t=1s
The selection is based on location and the materials that are fire her fight against