Commercial Construction & Renovation

MAY-JUN 2016

Commercial Construction & Renovation helps our subscribers design, build and maintain better commercial facilities by delivering content to meet the information needs of today's high-level executives.

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CLEARING THE AIR COMMERCIAL KITCHENS GTC was a natural choice for the job, which began in August 2013, and concluded three months later. The firm's 35- plus employees include eight sheet metal pros, 12 pipefitters and six service personnel. The market's budget for the total project was $1.2 million. CEO Bob Billings says that as a union shop they simply draw on the local unions (Local 189 of the United Association of Plumb- ers & Pipeftters, and Local 24 of the International Association of Sheetmetal Workers) for skilled labor support as needed to complete complex projects. Billings says GTC's territory includes all of Central Ohio within a 100-mile radius of Columbus. It exclusively focused on industrial and commercial HVAC and mechanical systems service work. Billings chose Mike House, project manager, to direct the North Market's ventilation retroft. House says the North Market project involved extensive coordination and well-defned logistics because of the need for the market and the vendors to remain operational during the entire retroft project. "I met with managers of the market and vendors every day during our work there," House says. "They always needed to know where we'd be so that everyone could remain in operation. We had to coordinate with all of the other trades. Adding to the challenge was the inability to store materials there. More than meeting code Because the market is in an older building, there was a lot of stuff on the ground. It also was attached to the ceiling, which had to be moved to complete the ventilation work. The commercial ductwork was a fairly specialized installation. GTC pros installed hundreds of feet of 14-inch to 36-inch Selkirk ZeroClear kitchen grease duct with a zero clearance to combustible rating and integral chase construction. The high-temp fber insulated, double wall construction provides a two- hour fre resistance rating and eliminates the need for a separately constructed, fre-rated enclosure around the duct. The grease duct was installed to remain fully exposed and includes dozens of access door clean-outs. "I was initially concerned about the exposed duct," says Steve Alvarez, project manager for the City of Columbus. "From a walkway on the second foor, the duct can be touched. I was concerned about the possibility of burns. But when it was apparent that – matched with the kitchen hoods – the ducts met code and could be touched with no risk of burn, I became a proponent for the plan." Another advantage to the Selkirk duct was the ability to install it with minimal slope. Typically, a 10-inch fall is required for every 40 feet of vent. House says the Selkirk material required only 1/16-inch per foot. Also installed by GTC crews were eight 10-foot, and two 8-foot Halton Capture Jet kitchen hoods, designed to effciently eliminate heat and all emissions within the convected plume from all cooking spaces. All of the (NFPA) Type 1 hoods, which are 98 COMMERCIAL CONSTRUCTION & RENOVATION — MAY : JUNE 2016

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