This traditional egg-crate style with 3/8" wide webs maximizes air flow. Frames are cut from 1-3/16" rabbeted stock. The frame is glued and blind-nailed to the subfloor and the flooring fitted to it. Custom units overall dimensions are 4" over duct opening. Please Note: The Egg-Crate Style Flush Model No Frame custom units overall dimensions are 2" over duct opening.
If not specified on your order, the eggcrate pattern may not have equal sized holes. Contact Grill Works for detailed information regarding this.