The largest of the three models, recommend for extreme snow conditions. The VentSaver HD Series is made from non-corrosive, powder-coated aluminum and stainless steel aircraft cable. Also provided are stainless steel nuts, bolts and heavy duty 1 1/2" lag screws. The HD Series will fit up to 12/12 pitch and an infinite array of sizes from 1" to 14" around. The massive fin has a 14" standing profile that is designed to protect taller roof stacks, chimneys, gas vents and masts. The beauty of the HD Series is the variety of applications it will fit as well as the ease of installation.