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%.
Scented candles and candle toppers -- Passive diffusers -- Paper sachets -- Fragranced greeting cards Houston Harvest will be introducing: -- HOT TAMALES(R) brand popcorn in time for Valentine's Day '09.
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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