Abstract: A roof ventilation system for ventilating a building with a metal roof formed of a series of metal panels joined by standing seams, and having a vent slot disposed along the roof ridge in proximity to an edge of the metal panels. A plurality of clips are disposed at intervals on each side of the vent slot. Each clip is adapted to slip onto the upper edge of the metal panels and to straddle one of the standing seams. The clip includes a top cap-engaging portion, a hook portion formed by a lower leg and an upper leg spaced for receiving the upper edge of adjacent metal panels, and a wall portion which extends between the upper leg of the hook portion and the cap-engaging portion. The cap-engaging portion, the upper leg and the wall portion define a channel adapted to retain sections of air-permeable venting material along the vent slot. A slot in the clip extends through the upper leg and the side wall for receiving the standing seam. The clip may be formed from a flat rectangular sheet.