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back blades parallel to longest dimension
Zinc plated steel closure spring
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening (front blades parallel to shortest dimension)
Half-length screwdriver operated Scoop Extractor
Aluminum Airfoil Blade Double Deflection Diffuser 903-18X6 Finish:Designer Color - Coffee Tan back blades parallel to longestStandard Features Double deflection surface mount grille with adjustable airfoil blades Front blades parallel to longest dimension, back blades parallel to the shortest dimension Extruded aluminum surface mount frame with signature line marks Provides 4 way air flow on one plane Nylon bushings on adj. blades prevent metal on metal rattle Countersunk mounting holes with color matching Phillips Pozidriv screws Rust resistant pre coat with durable powder
