16"W x 4"H

Item No:	Nominal Size	Size (Duct Opening)	Model	Slots	Neck Size	Actual Size	Material	Outer Dimensions	Color	Bulk Pricing						Order
Item No:	Nominal Size	Size (Duct Opening)	Model	Slots	Neck Size	Actual Size	Material	Outer Dimensions	Color	1	2-10	11-20	21-49	50+	100+	Order
210400-16		16"W x 4"H					Steel	17-3/4"W X 5-3/4"H	White	$32.67	$27.77	$26.14	$24.51	$22.87		Quantity for 16"x4" White Steel Adjustable Supply Register, Air Vent Cover with Damper for Sidewall Or Ceiling
421108-11		16"W x 4"H					Aluminum	17-3/4"W X 5-3/4"H	White	$40.59	$34.51	$32.48	$30.45	$28.42		Quantity for 16"x4" White Aluminum Adjustable Supply Register, Rust-Proof Supply Grille for Wall & Ceiling

Let's get the fit right the first time