window balance stamp #
A home owner from LANCASTER CA says:
November 18, 2015
My balance has 26 4 BSI on it. how do I tell the sash wieght ?
Tom from SWISCO responded:
November 19, 2015
A stamp of "26 4" usually corresponds to our 2640 option, but you can always weigh your sash on a scale to confirm. We have a chart on the S385-26 store page you can use as reference.