Good crawlspace ventilation circulates fresh air through the crawlspace. For the best results, open foundation vents in the summer to allow moisture out and close foundation vents in the winter.
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Remove the old vent and clean the edges of the vent hole.
Measure the height and width of the vent hole. Most foundation vent holes are 16 inches by 8 inches. Take the measurements with you to make your purchase.
Insert the barb end of the tab into the slot in the vent body. Usually two tabs in the bottom and one in the top are sufficient.
Set the hex nut in the slot on the outside of the vent and thread the setscrew through it from inside the vent.
Slide the vent into the vent hole. The tabs should hold the vent in place. Tighten the setscrews to secure the vent to the foundation.