I'm currently install a stove in my basement. Going through poured walls with both vent and oak. The vent cap is a duravent directional horizontal cap that will fall 18-24 inches from the outside wall. The oak will be flush to the wall. My question is does the oak need to be 12 inches below the vent if it is that far from the vent cap or can I put it closer. I'm just trying to keep the intake as high as possible off the ground for snow build up. With the 12 inch clearance it would still give me about 36 inches from ground to intake but I'd like a little more.