Air preheater, · An air preheater (APH) is any device designed to heat air before another process (for example, combustion in a boiler) with the primary objective of increasing the thermal efficiency of the process. They may be used alone or to replace a recuperative heat system or to replace a steam coil. In particular, this article describes the combustion ...Fan (machine), · A fan is a powered machine used to create flow within a fluid, typically a gas such as air. A fan consists of a rotating arrangement of vanes or blades which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing or case. This may direct the ...floridadep.gov, · The 4/23/08 amendments to 63.2358(b)(1) and (c)(1), and to entries 4. and 6. of TABLE 10 are withdrawn as of July 17, 2008. Sections 63.2346, 63.2358, and 63.2390; and Table 10 are amended. Clarifies combustion control device compliance requirements, certain storage tank control compliance dates, and vapor balance system monitoring requirements.