Guys, I have an 8 inch fan attached to a Wye connector in order to split my ducting for two rows of lights. Currently only one row is being used, so I covered one end of the Wye with a circular piece of cardboard and secured it with aluminum duct tape as a seal. Only thing I'm concerned about is that my fan might be so strong that it might pull air right through the cardboard (if the cardboard is porous enough) the cardboard itself is smooth and free of creases or any kind of damage, but I'm not certain if it can hold out the air. What do you guys think?
