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Okay, because most of the times when I see grille block threads, they remove the grille and block the inside of the grille, which I see as an inefficient grille block. My lower duct tape grille block and upper side grille blocks are coming off now, and so I'm hoping to make my foam board grille blocks soon so they will last longer. Sure, it's not coroplast, but it's definitely more water resistant than duct tape. How should I attach the foam board... hmm. any idea's?
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