This Master Flow 10 in. x 4 in. x 6 in. Register Box with Flange is constructed from durable 30-gauge zinc-coated galvanized steel for long-lasting corrosion resistance. Designed to create a straight, in-line transition from a 6-inch round duct or insulated flexible pipe to a 10-inch x 4-inch air register or grille, it features a built-in flange for secure installation to joists or drywall frames. Rated for temperatures ranging from 100°F to 390°F, it is ideal for residential and commercial HVAC applications and can be easily installed using sheet metal screws

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