Our 4" drainable louvers are available in 3 different blade configurations. Priced below is the 4375D which has the highest free area but the lowest of the 3 in initial water penetration level. Prices will vary up a bit (not too much) for the 445D and the 445DD (double channel louvers). All are available with channel frame or flange frame and both insect screen and bird screen options Several finish options are available from 20 year Kynar, primed, Anodized, and Mill Finish.
After selecting your size, click the "Blue Hot Link" for spec sheets and information.
If you can't find your size select a larger one, enter your desired size in hole size box.