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John Vastyan is president of Common Ground, and a senior contributor for Commercial Construction & Renovation magazine. Rooftop-ready solution Compared to the work done inside the building, the actual installation of the new rooftop equipment was quite simple, House says. "The Modine Atherion ventilation systems are sized ideally to ft into the old Aaon rooftop curbs, so there was very little prep work involved in swapping-out the old systems with the new. We're well-acquainted with the Atherion equipment." The Atherion units specifed by Dynamix are designed to meet ASHRAE 189.1 and 62.1 standards for IEER effciency and indoor air quality. The systems can be equipped to provide high-effciency gas heating, MERV16 air fltration. The North Market units are equipped with 80 percent effcient, 500 MBH furnaces with hot gas reheat and the capability for 100 percent outside air ventilation for greater energy savings. Schlotterbeck says the Atherion's gas burners maintain more than 80 percent burner effciency and modulate down to 15 percent of the full rating. This allows improved effciency while maintaining discharge air temperatures during the heating season within a few degrees of setpoint. "The makeup air units are specifcally designed to vary the amount of outside air to the inside space," Schlotterbeck says. "A controls signal originating from the exhaust hoods and passed through the building automation system (BAS) to the makeup units ensures that they draw enough outside air while precisely tracking the amount of air evacuated by the central fan and kitchen hoods to maintain positive pressurization of the building." Up on the roof Through September and October 2013, GTC crews worked evenings to complete most of the interior grease duct and kitchen hood instal- lations. On an overcast day in November 2013, GCT removed all of the old rooftop equipment, with ready replacements. "We had to cordon-off about one-quarter of the parking lot," House says. "A small crane arrived to unload the rooftop units, curb adapters and all of our other material. We needed a much larger, 90-ton crane with a 120-foot boom to lift the rooftop equipment onto the roof because of the need to reach so far up, and in, from just one location on the ground." During the afternoon, the building closed as the big crane cranked up for its fst task: GTC crews were in place to eliminate the old rooftop systems. As quickly as the old equipment came down, new curb adapters were ftted and preparations were made to line up the new supply and return ducts, gas supply and all wiring. That evening, with the crane work completed, a GTC crew remained behind to activate two of the new Atherion units and the big fan for morning operation. When the sun rose, and soon vendors began to arrive for the new day, the ventilation system was mostly operational. GTC crews made quick work of the remaining installation work. CCR CLEARING THE AIR COMMERCIAL KITCHENS 100 COMMERCIAL CONSTRUCTION & RENOVATION — MAY : JUNE 2016