Spiral Balance, Aluminium Window - # 640 1003C 1930E 978L
Narrow and fully sealed variable pitch spiral and torsion spring balance and foot system for Timber or Aluminium Double Hung windows.
Balance Number: 640
Closed dimension: 978mm (black tube length) - requires no more than 7 tension turns
Used in conjunction with Adjustable or TFD foot
Sold singly (ADD number required)
Foot sold separately
It is recommended that spiral balances are supported in a 15mm x 15mm rebate
