Series 210 balance

Hello there!

This isn't the Series 210. The 15-087 pivot shoe and 15-086 housing look like better matches. If the window sash is 30-pounds, you can use one S180-10 10-pound spring and one S180-05 5-pound spring on both sides of the window. With 15 pounds of support on each side, this would total 30 pounds of overall support. 

Let us know if you have any questions!