The location of an evaporative system depends entirely on whether you are dealing with a vehicle's emissions control setup or a residential climate control unit. In automobiles, the evaporative emission control system components are distributed across the chassis; the fuel tank sits underneath the rear, the charcoal canister is typically mounted near the rear subframe or spare tire well, and the purge control valves are located under the hood near the intake manifold. For residential climate control, an evaporative swamp cooler is usually installed either on the roof of the home, mounted against an exterior wall, or placed in a ground-level window opening, allowing it direct access to fresh, dry outdoor air.
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