Extruded Aluminum Model "FL" Vent
Sizing Chart

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(1-1/2" deep with 1" front flange frame style) All sizes are width by height.

All order size widths DO NOT INCLUDE screwheads on jamb sections. Tip to Tip dimension of outside flange will be 2" wider and 2" higher than order size due to 1" front flange on all four sides of ventilator. To figure the size to order based on the existing rough opening OR the inside dimension of the duct the ventilator must fit inside:

ORDER SIZE WIDTH: Deduct a minimum of 1/2" from the opening size width.
ORDER SIZE HEIGHT: Deduct a minimum of 1/4" from the opening size height.

Note #1: These figures above allow for a standard 1/8" caulk joint on all four sides of the ventilator and take into consideration the screwheads on the left and right hand interior sides of the ventilator.

Note #2: Brick ventilators are NOT undersized, therefore FL ventilators will finish 1/4" wider than the order size due to fastener heads on jamb sections. Height will finish true the order size.