An air handling unit is a device used to filter, condition, and circulate air as part of HVAC equipment. An air handling unit system includes a large insulated metal box that comprises a fan, heating and cooling elements, sound attenuators, filter racks, and dampers. Air handlers are connected to a ductwork system through which conditioned air is distributed across the building and returned to the air handler. It caters to various needs such as heating, cooling, or both, depending on the specific duty and weather conditions. The capacity, size, and complexity of air handling unit systems vary considerably depending on the job they are designed to perform.

Sunglasses are worn to avoid sunlight and high-visibility light that can damage or cause discomfort to the eyes. Continuous exposure to harmful UV radiations can damage the eyes or retina. Hence, sunglasses with a high EPF protect the eyes, especially from the rising effects of global warming. Sunglasses can be without prescription (called Plano) or with prescriptio (called Rx). The lenses used in sunglasses are usually made of polycarbonate, ADC, nylon, or glass. The frames are usually made of nylon, zyl, plastic, and metal. There are many styles and varieties of sunglasses available in the market. Some of the most popular are aviators, wayfarers, mirrored, and teashades.

In general, the terms 'small arms' and 'light weapons' are used for small and lightweight weapons that can be operated by one person. They usually include revolvers, pistols, rifles, submachine guns, light machine guns, heavy machine guns, grenade launchers, portable anti-aircraft guns, portable anti-tank guns, and mortars.

Anti-counterfeit packaging is the process of providing secure packaging to products to reduce counterfeiting or imitation, thereby improving the safety of packaged goods.