Passive diffuser

Passive diffuser

An air supply outlet, without a fan, that relies on pressurized plenum or duct air to deliver air into the conditioned space of the building.
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With some exceptions, such as the impressive growth of The Yankee Candle's brand, Fragrance Spheres, passive diffusers are giving way to power-operated devices under the active segment that increased by nearly 5%.
Sizing of air terminals and determination of the number and location of passive diffusers should recognize that Type II leakage will contribute a significant amount of uncontrolled conditioning air to the space.
They typically are less fragrant than a scented candle or electric plug-type fragrancer, but more robust than potpourri, fragranced gel, and other passive diffusers.
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