Builders Best Saf-t-duct Dryer Outlet Box

• Fits all 16" centers 2" x 4" & 2" x 6"
• 6 prescored true 4" dia knockouts in most common positions
• 6 starburst knockouts for gas connections & venting
• Plastic meets UL standard 94HB tests for flammability
• Self-trimming unit 18"W x 24"H
• White;