Overview
Nailor Electric Duct Heaters are self-contained heating units designed for installation in air handling systems. Some heaters are an integral part of other equipment, some have been approved for direct attachment to other equipment such as heat pumps, fans and variable air volume terminals, while others are approved for use as complete heating units to be mounted in air ducts.

These heaters provide precision heating for proper space control by handling dynamic heating load demands. Multiple locations within a single building allows maximum potential for individual control of each zone. They can be used as primary heat, preheat, reheat and supplemental heat or auxiliary heat.

Definitions:

Primary heat is the heat source for the entire building.

Preheat is used to temper air where it enters the building and prior to another air conditioning source.

Reheat is used to raise the air temperature of air previously conditioned by another process before distribution to the zone.

Supplemental or auxiliary heat is used to temporarily boost the heating capacity of another piece of equipment such as a heat pump.

Design:

Nailor Electric Duct Heaters are designed with electrical resistance elements arranged in the most advantageous pattern for heat transfer to the air stream. Nailor Duct Heaters provide constant heat as long as the heater is energized and the air velocity over the elements is constant. The wire surface temperature may vary from 800°F to 1200°F (427°C to 649°C) under normal conditions so that the operating temperature is below that which would produce a red glow.

Model DHR:

Electric Duct Heaters are available with open coil, helically wound resistance heating elements exposed directly to the air stream. The elements are supported by ribbed type ceramic insulators.Open coil elements offer little resistance to air flow and provide a very small surface to attract dirt or lint.