29 9 DW CMC 10

Hello,

Take a look at our S385-30 channel balance. You'll need to weigh your bottom window sash and follow the chart below to choose the correct spring strength option. Thank you.

Stamp Option Sash Weight Range

2910               7 to 12 lbs

2920              12 to 16 lbs

2930              16 to 23 lbs

2940              23 to 28 lbs

2950              28 to 32 lbs

2960              32 to 35 lbs

2965              35 to 39 lbs

2970             39 to 42 lbs

2975             42 to 45 lbs