How many vents should be there in the crawl space and why?
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Tannu
my question is how many open vents (for crawl space) are required n what if some are blocked?
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Check your local building codes. In our area we close all vents in Oct - Mar timeframe and open them the rest of the year. The vents help allow moisture out of the crawl space.
It will depend on your house and building codes for your area. If there are some that are blocked, it's important to get those un-blocked otherwise you could end up with moisture or mold issues.
Need to unblock the vents they were put in for reason. Air Flow