This Master Flow Ceiling Register Box provides a durable transition from an 8-inch round pipe or insulated flexible duct to a 10-inch by 10-inch air register or grille. Built from 30-gauge, zinc-coated galvanized steel, it is designed specifically for ceiling applications and can be secured with sheet metal screws. The sturdy construction ensures long-lasting performance in various HVAC systems, with a maximum temperature rating of 390°F

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