![Fantech - 48-1/2 x 48-1/2" Square Wall Dampers - 49" Rough Opening Width x 49" Rough Opening Height, For Use with 1SDE48, 1MDE48, 1HDE48 - First Tool & Supply](http://firsttoolandsupply.com/cdn/shop/products/5334197-11_d8b5c6c9-d35a-4c49-9460-6d926e67ba5c_1024x1024.jpg?v=1608164342)
Fantech - 48-1/2 x 48-1/2" Square Wall Dampers - 49" Rough Opening Width x 49" Rough Opening Height, For Use with 1SDE48, 1MDE48, 1HDE48
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