Yankee Candle Whole Home Air Freshener - The Yankee Candle Brand is the #1 Consumer choice in candles that fragrance the home. This fragrance device performs longer than its popular HVAC competition, and works on most filters for HVAC systems. Sharp orange and golden amber bring that great beach feeling of being warmed all the way through by a perfect summer sun. Testing Procedure for Performance: A lab study was done on the HVAC furnace filter devices to mimic the real-world. Samples of each device were hung on a standard HVAC furnace filter in a testing chamber in a lab, which was designed to mimic a typical home setting and was designed to subject each of the test devices to the exact same factors: air flow, temperature, humidity, etc. Each of the devices were weighed each day to an accuracy of 1/100th of a gram and the weight change between days shows the amount of fragrance each device dispersed each day.