STOP STICKER STAIN ! Air-O-Flow kiln blocks provide maximum air flow between the kiln block and lumber surface. Air-O-Flow profiled kiln blocks are ideal for drying thicker lumber and slabs. These larger blocks also work great for between lumber packs and bottom of packs. Custom sizes available. Small orders (500 piece minimum) to Truckload quantities. Call Kelvin @ 731-446-4069.