Kingsman Horizontal Wall Thimble Shield for Low EnclosuresHorizontal Wall Thimble Shield The Z58WTS horizontal wall thimble is a shield for low enclosures and helps traps any unwanted particles in the air. this is often just one type of enclosures that Kingsman provides. Other ventilation accessories are available for separate purchase. Features Durable Lightweight Type: Wall Thimble Shield Direction: Horizontal a shield for low enclosures For use with Venting 5 8" MCVP42 MCVST42 Direct Vent Fireplace CA