Garage DCV System Case Study: Opera Plaza, S.F. Adapting To Older, Non-inverter Duty Motors Not An Impediment – Actually Extends Garage Mechanical System’s Operational Life The Property Constructed in 1982 and offering a wide choice of residences, businesses and shops, Opera Plaza houses 450 residential units, more than 80,000 square feet of office and retail space and a subterranean garage providing 600 parking spaces. The Savings Opportunity / Challenge The retrofit of Opera Plaza’s garage presented Nagle Energy Solutions (NES) a unique opportunity: To retrofit a 32-year-old ventilation system consisting entirely of two-speed garage fan motors that property management ran for years on a 24/7 basis at their “low” speeds, having bypassed an inoperable ACME

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