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Heating and cooling tools can be used for temperature and climate control and testing in many different environments, but some are designed for specific purposes. Take, for instance, smoke emitters and smoke candles. Both emitters and candles, once ignited, produce a constant rate of smoke that can be used to test ventilation and chimney systems, detect leakage in ducts and drainage, or used as simulators in fire and disaster training. AC manifold gauges are also used in testing HVAC and other systems. You can browse Zoro’s entire selection of HVAC installation and maintenance products, including manifold hose kits, flush hoses, extension rods and more.