larry merlau
Member
- Messages
- 18,741
- Location
- Delton, Michigan
got a window bench that will be covering a old cold air return. the size of the old return is 4" by 30" long but the groves are only 8 slots and 2" high not sure of width.. but am quessing around 3/8" so i need to make openings in the back of the bench tolet in air to this and i have 2-2.5x14- wall registers to put in the front of the bench apron.. so how many inches of clear space do i need to make in the back? thanks for the math gerus out here for your help.