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The QuietCool R-40 Winterized Insert is great for areas that get really cold during the winter. This is installed during the months that the QuietCool is not used to increase the R Insulation Value of the damper box to R-45. This WI-1436 is used for a QuietCool CL-6400 or QuietCool ES-6400. Please Note this product cannot be shipped to Hawaii. Made In The USA.

QuietCool R-40 Winterized Insert For 6400 Series, 14&quot;L x 36&quot;W x 3&quot;H

r-40-winterized-insert-for-6400-series-14-l-x-36-w-x-3-h

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