The indoor sound cover is to be used with NCP condensing units, properly installed in the WSD series wall sleeve. (models 1000-WSD-12, 3000-WSD-12, 4000-WSD-12 and 5000-WSD-12 only) when properly installed, the indoor sound is substantially reduced. As well, thermal conductivity from the outdoors is eliminated.
National Comfort Products Insulated Indoor Sound Cover, Series: 3000 Series, For Use With: NCP Condensing Units, Specifications: 68.3 dBA, Domestic