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The ATP4-100 is a U-shaped, 48" long x 4" wide heat transfer plates manufactured from 0.016" thick stamped aluminum. For use with PEX tubing of all types. These plates can be used for underfloor heating (between the joists, stapled to the bottom of the subfloor) or "sandwich" (between subfloor and finished floor) type radiant heating applications. When installed between the joists, recommended spacing for tubing is 8" OC (On Center).