40"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 41.25"W x 7.25"H] w4h4 Actual Filter Size – 27 accordion content RFG2525 Black-HP 18" Round Duct Pipe

Actual Filter Size – 27 3/4"w x 29 3/4" x 1"

Premium Quality – Our duct stick-on collar with damper has made of high-quality galvanized steel metal for durability and rust prevention

Actual Filter Size – 13 3/4"w x 33 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 8" OR 8" x 24" duct opening (measured at the opening)

Ideal for straight-line transitions

40"W X 6"H [Duct Opening] Linear Aluminum Clip On Bar Return Air Grille [Outer Dimensions: 41.25"W x 7.25"H] w4h4 Actual Filter Size – 27 accordion content RFG2525 Black HP 18" Round Duct Pipe Actual Filter Size – 27 3 4"w x 29 3 4" x 1" Premium Quality – Our duct stick on collar with damper has made of high quality galvanized steel metal for durability and rust prevention