In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
I noticed that the FieldControls GVD-6 vent damper, installed on my gas boiler, was in the 'hold open' mode set by the switch on the damper. I switched it to 'automatic' mode, and it seems to be functioning properly. However, I am wondering, can there be a reason why this control would be disabled on purpose, so that I should not enable it?