I have a handyman service. One of my customers has your service. Your tech scared the crap out of her!!!!! He told her that scorpions could drop on her from the bathroom exhaust fans!!!! While this could happen if you did an proper job around her house the scorpion will not get there!!!! The tech told her to put screen in those vents. I told her that it will restrict the air flow after a while from the dust. THAT WILL CAUSE THE FAN TO OVER HEAT!!!!! So much for warranty. Bathroom fans have built in flaps to stop this from happening. He also told her to block the weep holes on her windows!!!! When the rain water backs up and into the walls the termites will love it. Job security.