A crawl space or underfloor space must contain C) a disconnecting means for HVAC equipment.
Major HVAC equipment includes heaters, air handling units, and chillers or air conditioners. The central HVAC system is located away from the central equipment room building and supplies conditioned air through the duct system.
The air conditioner circuit breaker (ACD) is located between the road center and the air conditioner. ACDs provide a visible disconnecting means when performing maintenance and are commonly referred to as circuit breakers, extractors, or air conditioning switches.
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