I have the armstrong 584a humiguard plus and they are 3/4" thick. these one are 5/8" thick are these the right ones? and if they're not is there free

Dennis, The panels you referred to are different than the existing 584A, the current item is 584B, it is a different panel than 1774, indicated by the item number.

I would like to try to order the right ones. the 584 B does not show that what is the item number that I need?

It's likely listed as 584, suffixes are not usually listed on the site.

How can I find out what style tile we have at our Animal Hospital?

Look on the backside of the tile, the sku or style no. usually is located there.

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Description

🔇 Elevate your workspace with quiet, clean, and safe ceilings—because your environment deserves the best.

SAFETY FIRST - ASTM E84 Class A fire-resistive rating ensures premium fire safety
BUILT TO LAST - HumiGuard Plus technology resists sagging, mold, and mildew in high humidity environments
VERSATILE STYLE - Clean white DUNE finish complements professional and utility spaces alike
QUIET CONFIDENCE - Minimizes noise transfer for focused, distraction-free spaces
EFFORTLESS UPGRADE - Easy lay-in installation fits standard 15/16" ceiling grids—no tools or adhesives needed

Armstrong 2x2 White Ceiling Tiles (16 pcs) feature acoustic mineral fiber panels designed to reduce noise and block sound between rooms. These fire-resistive (ASTM E84 Class A) tiles install easily in standard suspended ceiling grids without glue or nails. With HumiGuard Plus protection, they resist sagging, mold, and mildew, making them ideal for high humidity indoor spaces such as offices, basements, and retail environments. The clean white DUNE finish and tegular edge style provide a professional, versatile look.

Specifications

Brand	Armstrong
Material	Mineral Fiber
Size	24"W x 24"W x 5/8"T
Color	White
Finish Type	Painted
Style	DUNE
Installation Type	Lay-In
Product Dimensions	24"L x 24"W
Pattern	Solid
Item Weight	54 Pounds
Shape	Square
Item Thickness	0.63 Inches
Edge Style	Tegular
Unit Count	16.0 Count
Coverage	Storage Rooms, Discount Stores, Utility Rooms, Basements, High Humidity Areas
Form Factor	square tiles with tegular edge
Water Resistance Level	Water Resistant
Special Feature	Worry-free Packaging
UPC	888264406451
Manufacturer	Armstrong
Part Number	1774A
Item Weight	54 pounds
Item model number	1774, 1774A
Is Discontinued By Manufacturer	No
Finish	Painted
Item Package Quantity	1
Number Of Pieces	16
Performance Description	Acoustical, HUMIGUARD Plus, BIOBLOCK Perf.
Mounting Type	Ceiling
Special Features	Worry-free Packaging
Usage	Indoor Use Only
Batteries Included?	No
Batteries Required?	No