Hi everyone, Im hoping someone can help me out, my house was built in the mid 60's, and thinking i can just go to a local place to buy cold air vents threw some old ones away. No local place seems to carry the size i need, they are like 15 3/4" x 7 3/4" x 1". Does anyone know where i can find these? They need to be like 1" thick because some ductwork sticks out of the wall. and they are all at the bottom of the wall at the floor. Any help would be great. Thank you.