Balance Options

A quick learner from Missouri says:
What do the options 28d 28c 28b 28a mean for a S795-28 balance?
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Donna from SWISCO responded:
The stamp options indicate the balance strength. If you cannot locate the stamp on the original window balance remove the window sash and place it on a scale.

S795-28 with stamp option:

28a will carry a window sash weight range of 7 through 12 pounds.

28b will carry a window sash weight range of 12 through 18 pounds.

28c will carry a window sash weight range of 18 through 23 pounds.

28d will carry a window sash weight range of 23 through 28 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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