Description 4″ basic retainer for our snap-in style black louver. Retainer does not have have a hose adapter attached. Snap-in louver requires a retainer or retainer with hose adapter for installation. Different sizes of retainers available for different sizes of duct hose. Download “Retainer Specification Sheet” to determine which retainer you require. Louver (sold separate) and retainer with 2.5″ hose adapter shown in example below. Download Louver Specification Sheet Download Retainer Specification Sheet
