This grille can be attached to a plastic 4 in. louvered exhaust hood, such as Home Depot's Everbuilt (SKU #1000052123). With short screws, the grille can be attached to the plastic of the hood frame. If the hood frame is weak or deteriorated, the grille can be attached to the wall of the house through the hood frame using longer screws.
Supports are needed for the grille slats. Rectangular drain holes at the bottom of the grille do not require supports.
The author marked this model as their own original creation.