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What does SD stand for?

SD stands for Supply Duct

This definition appears frequently and is found in the following Acronym Finder categories:

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We have 158 other meanings of SD in our Acronym Attic

Samples in periodicals archive:

When this happens, not enough air passes through the return duct, across the evaporator coil (where it's cooled) and out the supply duct.
It is standard practice in the fabric air dispersion system industry to manufacture the fabric duct larger than the rigid supply duct to which it is attached, in order to facilitate the mounting of the fabric duct.
This is especially true in HVAC systems with acoustical duct liners, which are frequently used in air-handler fan housings and supply ducts to reduce sound transmission and provide thermal insulation.
Air distribution is through 32 vertical supply ducts located along the central core of each block.