FA 40 Window Channel Balance Replacement 1/2" (Resistance 40)

FA 40 Window Channel Balance Replacement 1/2" (Resistance 40) Window Channel Balance Replacement Details: 1/2" Channel Balance Actually 5/8" but considered 1/2" in the trade. Channel Depth (Inches): 5/8 Channel Width (Inches): 9/16 Guides Attached: Yes  Channel Sash Balance Winged Guides Pre-Installed  FA Series Sash Balance with Guides pre-attached to the channel. This balance is in stock with guides factory installed. Number Stamped on Channel: 1840 or 18-4 = 19" Long Vent Weight Range 14 to 17 lbs. 1940 or 19-4 = 20" Long Vent Weight Range 14 to 17 lbs. 2040 or 20-4 = 21" Long Vent Weight Range 15 to 23 lbs. 2140 or 21-4 = 22" Long Vent Weight Range 15 to 23 lbs. 2240 or 22-4 = 23" Long Vent Weight Range 19 to 23 lbs. 2340 or 23-4 = 24" Long Vent Weight Range 18 to 23 lbs. 2440 or 24-4 = 25" Long Vent Weight Range 19 to 24 lbs. 2540 or 25-4 = 26" Long Vent Weight Range 19 to 25 lbs. 2640 or 26-4 = 27" Long  Vent Weight Range 19 to 26 lbs. 2740 or 27-4 = 28" Long  Vent We