Noritz  SV-CK-3  Sv Conversion Kit Ideal for Indoor Combustion Air Intake for Use on Condensing Dv Models Only Not for Use in Foam Sealed Attics SV Conversion Kit for DV models Elegant design and finish The product is manufactured in Japan Converts condensing (DV) direct vent models to atmospheric design. Will consume make up air from available environment such as vented attic space. Builtin bird/bug screen to protect blower motor fits all Noritz NCC models PVC glue on install for ease of installation