Double Hung Window Balance

Question

27" metal channel 1/2" width
block and tackle
no part no.
need replacement for lower double hung window 27"x 30"

Jasmine · Accepted Answer

You'll need either the S351-27 or the S390-27 to replace your balances. To determine which series you need, compare and confirm the depth of the shoe.

Since they do not have a stamp/marking on them, you'll need to confirm the exact weight of the window sash. There is a chart below the product description the lists the weight range each stamp can support.

Comparison of the S351 and S390 balance shoes.