If the duct is a standard size, remove the register and drop the fan into the boot. Secure it to the floor on each side with screws. If the duct is smaller than standard, see photos below. Plug the ...

How To Install a Vapor Barrier in a Crawl ... Use a shop vac or pump to remove excess water, then use fans or a dehumidifier to dry out the crawl space before adding a vapor barrier and other ...