Always measure width by height

For Surface Installation

• Measure your width of the opening and add 12" to the opening width
• Measure your height of the opening and add 16" to the height for a door or large opening due to the size of the hood

Considerations

• Concrete, masonry frame construction must be smooth and level
• Spring, motor or chain operation
• Ability to secure from inside and outside
• Location of the motor – right or left