order for channel balance

Question

Here is the number on the original channel balence: 17-3 FA2 CMC 9.  It is 18 inches long.  We can't tell whether we need 385 or 380.  Thanks

Tom · Accepted Answer

To tell the difference between Series 380 and Series 385, first check the top and bottom attachments for plastic wings. If the top is 19-005 and both sides have wings, you're on the right track.

Then, check which of these bottom attachments you have. If it's 1-3/32" in depth, choose S385-18 (1730). If it's 1", choose S380-18 (1730).

Comparison of 15-004 and 15-005