Um.. If I was you bro I wouldn't pull from outdoors. Or vent however you have it going. If you absolutely have to, then take a pair of your ladies panty hose and cover the vent opening, works great.. (; Mainly bc tht maybe how the little fookers are getting in there eating your plants. If you see holes and it looks as if there being eaten on, I would say aphids.. there kinda hard to see with the naked eye bro cause there small and kinda clear looking. If you happen to see what looks like white specks/dots and tiny black specks on the back sides of the leaves that's usually spider mites. I hope it's nothing but if it happens to be aphids it's best to catch um before they get out of hand. Here's a recipe I've used in the past that's all organic and works super good. Tried and true bro...
It's a garlic based oil spray. It not only kills many pests, including aphids, but acts as an antibacterial and anti-fungal agent, which helps to deter plant destroying diseases. Here’s the recipe:
add three to four cloves of finely chopped garlic to two teaspoons mineral oil and let it marinate for 24 hours. Strain into a one gallon jug of water and add one teaspoon liquid dish detergent. This can and should be stored, as it is too strong to be applied as is.
When ready to spray, add two tablespoons of the garlic oil mixture to a spray bottle and fill with water. Test the strength of the mixture on an inconspicuous area of your cannabis plant. Wait a day or two to ensure no leaf damage. If you see yellowing after the waiting period, further dilute the mixture and continue performing tests until you arrive to the proper concentration of garlic versus water. Once you know the proper ratio, spray the entire plant, paying special attention to the undersides of the leaves. If that's to much to mess with you can always get you a bottle of neem oil and dose them.. was just trying to give a hand in an effective way to kill those buggers without spending much $. I think a bulb of garlic is pennies on the dollar and shit everyone should have dish detergent (;