14"w x 14"h (Duct opening size) steel filter return grille with removable door for 1-inch filter replacement - Overall dimensions: 16.6"w X 16.6"h it refers to the size

it refers to the size of the "tongue"  so that it will fit in a 8"x8" hole

Stamped face steel construction with 1/2" fin spacing for high air flow

actual outside dimension is 14

ONE PAIR of 304 stainless steel braided premium washing machine hoses 5ft long each with 3/4" 90 degree elbow connection

Sped Queen

14"w x 14"h (Duct opening size) steel filter return grille with removable door for 1-inch filter replacement - Overall dimensions: 16.6"w X 16.6"h it refers to the sizeThe Listed size 14"x14" is for inside duct opening measurement, actual outside dimension is 16. 6"x16. 6" Stamped Face Steel Construction with 1 2" fin spacing for high air flow Screws are included for easy installation White Powder coating with matte finish Individually packed with card board box for ultra protection Size Selection Guide Measure the size of the air duct opening(the size of the hole ). Select the listed size that match the duct