Additional Details ------------------------------ Product description: The Centra micro filtration exhaust dust bag can be added to any central vacuum unit's exhaust that is vented indoors. It will collect any fine dust particles that might escape through the filter. This is an excellent choice if you desire a little extra filtration for your central vacuum system. The exhaust dust bag will collect dust and help cut down on odors. Cyclonic central vacuums should be exhausted outside and this filter is not an acceptable product for these system