Paul from SWISCO responded:
September 6, 2011
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Paul from SWISCO responded:
September 7, 2011
The option represents the length and strength. If you add one to the first two digits you will get the channel length. The second two digits represent the strength. We cross referenced your 21 4 E1 Caldwell stamp to our 2140 stamp. We could of also recommended a stamp depending on the weight of your window sash. If you would like to go that route, remove the window sash from the window and weigh it on a scale.
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Paul from SWISCO responded:
September 9, 2011
It appears you will need the 2140 stamp, which will carry a weight range of approximately 15 to 23 lbs.
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