Everbilt Evaporative Cooler Duct Insulator

This duct insulating pillow prevents cool air and drafts from entering through the grill. The pillow also reduces noise and heat loss. Not for use when the cooler is in operation.Friction fit for a full and positive sealEasy to installThick interior insulationFits 20 in. W x 20 in. L ductsFor additional fit information by brand/model of cooler, please see the info and guides FAQ link