1- Please take the grill out of the vent and place it on a flat surface.
2- Flip the grill and place it upside down so you can see the grill's flange that goes into the opening.
3- Using a measuring tape or a ruler, measure the width of the flange. If the size is between 3.5" to 4" ( 89 to 101mm) same as shown in the picture, a 4"X10" device is needed, and if it is between 2.5" to 3" (63 to 76 mm) a 3"X10" devices will fit into the opening.
Product Specifications (4"x10" devices):
- Dimensions: (LxWxH) 245x95x35 mm (9.6”x3.7”x1.3”)
- Airflow: 80 CFM at the default RPM, Max: 120 CFM
- Noise level: 28 dBA at default RPM
- Cord length: 150 cm (6ft)
- Power Supply: 12VDC 2.1X5mm (included in the packaging)
- Material: Fire Retardant Compound
Product Specifications (3"x10" devices):
- Dimensions: (LxWxH) 200x70x35 mm (7.8”x2.7”x1.3”)
- Airflow: 60 CFM at the default RPM, MAX: 90 CFM
- Noise level: 33 dBA at default RPM
- Cord length: 150 cm (6ft)
- Power Supply: 12VDC 2.1X5mm (included in the packaging)
- Material: Fire Retardant Compound