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- Coil Spring Cassette (Ferco) (A7) CF
Sold by: Each Color: White
Type: A7 Short Tail
Description:
These parts are stackable.
The letter in the Type corresponds to the tail length. A= Short Tail
The number in the Type corresponds to the sash weight in lbs that this component will balance.
Start with a short tail A and stack with the next length B, if necessary go to the next length C.
So 2 'B3' balances on either side of a window (4 'B3' balances in total), will support a sash weight of 12 lbs (4 x 3lbs).
So 3 'C4' balances on either side of a window (6 'C4' balances in total), will support a sash weight of 24 lbs (6 x 4lbs).
Constant Force System (CF)