Hardwoods are referring to trees that lose their leave in winter. It is a description applied to woods from deciduous broad-leafed trees (Angiosperms).
The latest version of the Harmonized System (HS) and Codes adopted by the United States is published by the U.S. International Trade Commission (ITC) as the Harmonized Tariff Schedule of the United States. You can use this guide to determine the numerical code assigned to a particular commodity; the descriptive passages can be helpful to determine the context of a particular commodity within classification.
Heating, Ventilation, and Air Conditioning (HVAC) controls the ambient environment (temperature, humidity, air flow, and air filtering) of a building and must be planned for and operated along with other data center components such as computing hardware, cabling, data storage, fire protection, physical security systems, and power.