20" x 30" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 19.75 X 29.75] 3-Pack Round Damper Ring Design – Heavier gauge than 4 X 12 Is CRFG2028 Width_14in

Design – Heavier gauge than needed

+ Product Details Size - 18"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 24" x 24" with 6" collar T-Bar drop ceiling perforated return grill - metal back casing

Durable Material - 30 Gauge Thick & Made of Thick & Durable Galvanized Sheet Metal - Used For HVAC System Duct Work In Any Building or Home

Enjoy efficient airflow

20" x 30" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 19.75 X 29.75] 3 Pack Round Damper Ring Design – Heavier gauge than 4 X 12 Is CRFG2028 Width_14in Design – Heavier gauge than needed + Product Details Size 18"w X 4"h is the size for the duct opening measurement only