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Depiction of New York World Building fire in New York City in 1882. Building codes in the United States are a collection of regulations and laws adopted by state and local jurisdictions that set “minimum requirements for how structural systems, plumbing, heating, ventilation, and air conditioning (), natural gas systems and other aspects of residential and commercial buildings should be ...
The Uniform Mechanical Code (UMC) is a model code developed by the International Association of Plumbing and Mechanical Officials to govern the installation, inspection and maintenance of HVAC (heating, ventilating and air-conditioning) and refrigeration systems. It is designated as an American National Standard.
Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.
The ventilation rate, for commercial, industrial, and institutional (CII) buildings, is normally expressed by the volumetric flow rate of outdoor air, introduced to the building. The typical units used are cubic feet per minute (CFM) in the imperial system, or liters per second (L/s) in the metric system (even though cubic meter per second is ...
The code has been widely used over the past five decades by jurisdictions throughout the United States and internationally. With the publication of the 2003 Edition of the Uniform Plumbing Code, another significant milestone was reached. For the first time in the history of the United States, a plumbing code was developed through a true ...
The official 2007 edition of the UCC. The Uniform Commercial Code (UCC), first published in 1952, is one of a number of uniform acts that have been established as law with the goal of harmonizing the laws of sales and other commercial transactions across the United States through UCC adoption by all 50 states, the District of Columbia, and the Territories of the United States.
The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure. On large systems, separate parallel vent stacks may also be run to ensure sufficient airflow, because the number of devices linked to an atmospheric vent, and their distances from it, are regulated by plumbing code.
An HVAC system that has a stable supply-air temperature, and varies the air flow rate to meet the temperature requirements. Compared to constant air volume systems, these systems conserve energy through lower fan speeds during times of lower temperature control demand. Most new commercial buildings have VAV systems.