The National Air Duct Cleaners Association (NADCA); also known as the HVAC Inspection, Cleaning, and Restoration Association; today announces the publication of a white paper on methods of inspecting ...

Duct routing looks simple on drawings, but once construction starts, it becomes one of the most challenging coordination tasks in a building project. Engineers design ducts for performance, ...

Article 725 covers remote-control, signaling, and power-limited circuits that are not an integral part of a device or appliance. The correct answer is: a) CL2P and CL3P Article 725 covers ...

The Spra-Kleen humidifiers have a 1-1/2 gallon per hour capacity, which is controlled by a humidistat. According to the manufacturer, the humidifiers have a unique method of humidifying and cleaning ...

All questions and answers are based on the 2017 NEC. Underlined text indicates a Code change. Q. What are the Code rules regarding wiring installed in ducts specifically fabricated for environmental ...

While exposed ceilings in office interiors lend a spacious, open feel, this trendy architectural feature has created a new challenge: finding a viable return air path. Plenum ceilings use the area ...

In last week's blog post on transite heat, I explained that most sub-slab ductwork is not transite. It's not transite heat, it's not transite ductwork, and it should not be labeled as such unless the ...