According to the Uniform Mechanical Code, an environmental duct is one used to convey air at a temperature not exceeding ______ either to or from an occupied area and not to be a part of a heating or air conditioning system.

According to the Uniform Mechanical Code, an environmental duct is one used to convey air at a temperature not exceeding ______ either to or from an occupied area and not to be a part of a heating or air conditioning system.