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[citation needed]Arrhythmias are also classified by site of origin: [citation needed] Atrial arrhythmia Arrhythmia may be classified by rate (tachycardia, bradycardia), mechanism (automaticity, re-entry, triggered) or duration (isolated premature beats; couplets; runs, that is 3 or more beats; non-sustained = less than 30 seconds or sustained= over 30 seconds). Bearings, Seals & Gaskets Automatic Trans. Ice storage air conditioning is the process of using ice for thermal energy storage.The process can reduce energy used for cooling during times of peak electrical demand. Additional vents are required to draw in the fresh air as the hot air is exhausted. Flexibility is everything. An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning system. 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