20"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
210400-21		20"W x 4"H					Steel	21-3/4"W X 5-3/4"H	White	$33.00	$28.05	$26.40	$24.75	$23.10		Quantity for 20"x4" White Steel Adjustable Supply Register, Air Vent Cover with Damper for Sidewall Or Ceiling
421108-16		20"W x 4"H					Aluminum	21-3/4"W X 5-3/4"H	White	$45.39	$38.59	$36.32	$34.05	$31.78		Quantity for 20"x4" White Aluminum Adjustable Supply Register, Rust-Proof Supply Grille for Wall & Ceiling

Let's get the fit right the first time