We are pleased to announce that beginning with production on Aug 4th of this year we will replace the
junction box assemblies for our HM Series heaters with a control panel assembly. This change was
suggested to us by a number of our customers as a significant product improvement opportunity. They
believed that the change to panel mount controls would improve visibility of operating status lights,
accessibility and serviceability of controls in customer applications.

Please review the dimensional drawings provided for the new control panels. The junction box drawings
are included for your comparison.

As an enhancement to product consistency and repeatability, we will incorporate an electronic speed
control in conjunction with a single speed fan motor on the combustion blower concurrently with the above
change. The speed control will improve consistency of low speed fan rpm and provide less variation in low
speed operation. Wiring changes are internal and customer wiring connections will not be affected by this
change.