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What does SD stand for?

SD stands for Smoke Damper (HVAC systems)

This definition appears very frequently

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We have 158 other meanings of SD in our Acronym Attic

Samples in periodicals archive:

The Sheet Metal Air Conditioning Contractors National Association (SMACNA) represents over 1,600 heating, ventilating and air conditioning contractors (HVAC); air and water testing and balancing firms; fire and smoke damper and louver manufacturers; and related sheet metal companies.
In recent years Qad-net has been diversifying into import substitution products in HVAC and have announced the addition of new product lines such as air filters, motorised fire and smoke dampers and louvres which will be manufactured and have been tested in compliance with international technical standards.