Designed for wall use, these are available in red oak as well as paint grade poplar. Other woods are available for an upcharge.
The 3/8 inch by 3/4 inch wide slats are angled and can be oriented to point up or to point down.
The ingenious snap on faceplate makes it easy to change filters.
Many standard sizes are available, and oddball custom sizes can be made.
Build time runs about 7 to 10 business days.
68 cents per square inch of duct opening in paint grade
80 cents per square inch of duct opening in red oak
s&h: 8%, but at least $14.95