We just moved into a rental house , they replaced the furnace recently and they used an old heater vent for the fresh air intake. As you can imagine it is acting like a giant vacuum in the living room, I am considering replacing the vent with a piece of plywood with two holes drilled in it with dryer vents up to a window about 8 feet away. I think I can hide it under the curtains mostly. Any ideas for material safety would be greatly appreciated