You must pass two qualifying exams in orthodontic assisting and infection control to become a Certified Orthodontic Assistant. As of April 2011, DANB certification for OAs was recognized in 38 states and required in four - Massachusetts, Maryland, New Jersey and Oregon.
American Standard Companies, Inc. was a global manufacturer of plumbing, heating, ventilating and air conditioning (HVAC) systems and services, bath and kitchen products and vehicle control systems.he company was formed in 1929 through the merger of the American Radiator Company and Standard Sanitary Manufacturing Company forming the American Radiator and Standard Sanitary Corporation. The group was renamed to the American Standard Corporation in 1967.
Installing a Trane central air conditioning system in a home ranging from 800 to 2,000 square feet can cost anywhere between $2,100 and $10,000, as of late 2009.Having to install ductwork will generally double the cost.rane has several models of air conditioners available to consumers. Some of the more popular models are the XL20i, the XL15i, the XR15 and the XB14. Each type of Trane air conditioner offers certain benefits and is ideal for certain applications.