21 12bsi marking channel balance

A home owner from Deland, Florida says:
I am in need of two Channel balances. The markings are as shown in the photos 21 12BSI and the channel itself measures 22 inches Not including the end pieces. Thank you for your time.
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Casey from SWISCO responded:

Hello,

It looks like you have either our S351-22, with a 15-002 bottom attachment, or S390-22, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. 

You'll also need to weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight.  Thank you!


1
A home owner from Deland, Florida says:
Thank you for your time. To the best of my ability, I have weighed the sash at 35.7 lbs and the bottom attachment is 1 1/8" deep.
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Casey from SWISCO responded:

Great, it sounds like you need the S390-22 channel balance with a 2170 strength option. 

S351-22 : 22
22" Series 351 Channel Balance
S351-22
$9.25
VIEW >
S390-22 : 22
22" Series 390 Channel Balance
S390-22
$8.95
VIEW >
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