Here at Roemtech we have talked to many people who are not completely clear on what it means to be have a plenum rated amplifier.
In general it means that you can legally put the amplifier above a ceiling that may be used for a plenum air return. Some ceilings have no specific ducting for return air, rather they use the general air space above the ceiling to draw air in and then deliver the conditioned air through sealed ducts. So when you put a device in that area called the “plenum” it needs to meet certain specifications, in this case UL2043.
Without getting too technical, the code does not want you to exceed a certain level of thermal energy or smoke density at any given time. So old tires above the ceiling – bad, cups of water – good. This makes sense because you don’t want to be choked out by blinding smoke in case of a fire and you certainly don’t want to add fuel to it either.
During the testing process all of this is measured very precisely by a federally approve lab. They burn the product and make sure it meets code.
So if a plenum rated amplifier is connected with plenum rated cable and installed above the ceiling, then you are in compliance with even the strictest of guidelines. No expensive plenum box needed.
At Roemtech, all of our amplifiers are plenum rated and have been tested to meet the UL2043 standard. We take great pride in the fact that we have always led the industry in plenum rated amplifier/mixers and will continue to come out with products that meet this specification.