The LDH and D Series Duct Heaters from Watlow makes use of Watrod™ heating elements measuring 0.430 in. (11 mm), and is very compatible with a number of non-pressurized air-heating systems. It is easy to install without needing any flues or fuel lines. These duct heaters can accommodate a variety of applications where combinations of different temperatures and air flow are needed, such as drying ovens, autoclaves, furnaces, load banks, and many more. This reliable instrument features a modular duct, removable individual modules, etc. that contribute to its performance and energy efficiency, quicker response time, reduced infiltration and minimal downtime.