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In-Line Forced Air Heaters

There are two types of InLine Forced Air Heaters: LDA – outlet temperature of 1000°F (538°C) and Inlet air or gas temperature up to 250°F (121°C) HAC – Exit air or gas temperature up to 1400°F (760°C) and Inlet air or gas temperature up to 250°F (121°C)

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Typical Applications

Laminating
Plastic Welding
Drying
Soldering

Baking
Preheating and Metalworking
Shrink Fitting

Packaging
Heat Shrinking
Sterilization

LDA In-line forced air heaters

Design Features:

Stainless Steel fitting is heli- arc welded at the air outlet.
Alloy 304 stainless steel tubing is used to provide high temperature strength and resistance to oxidation up to outlet temperature of 1000°F (538°C).
Inlet air or gas temperature up to 250°F (121°C).
Stainless Steel fitting is heli-arc welded at the air inlet.
Standard termination is 10″ (254 mm) long, Teflon^® insulated lead wires exiting through a potting adapter.

Heater Description

Stainless Steel fitting is heli- arc welde at the air outlet.

Alloy 304 stainless steel tubing is used to provide high temperature strength and resistance to oxidation up to outlet temperature of 1000°F (538°C). Inlet air or gas temperature up to 250°F (121°C).

Stainless Steel fitting is heli-arc welded at the air inlet.

Standard termination is 10″ (254 mm) long, Teflon^® insulated lead wires exiting through a potting adapter.

Heater Specifications

Heater Diameter (in)	Maximum Amperage	Cross Sectional Flow Area (in²)	Maximum SCFM (ft²)	Maximum Wattage/Linear Inch Of Heated Length
3/8	6	.030	8	200
1/2	8	.040	10	250
3/4	15	.120	20	500

Diameter	“A”	Watts	Volts	Connection	Part Number
	in	(mm)
0.5	51⁄2	139.7	400	120	3 Pins Male Insert	LDA00194
0.5	51⁄2	139.7	400	240	3 Pins Male Insert	LDA00196
0.5	51⁄2	139.7	600	120	3 Pins Male Insert	LDA00197
0.5	51⁄2	139.7	600	240	3 Pins Male Insert	LDA00198
0.5	51⁄2	139.7	400	120	36″ Leads	LDA00195
0.5	51⁄2	139.7	400	240	36″ Leads	LDA00199
0.5	51⁄2	139.7	600	120	36″ Leads	LDA00200
0.5	51⁄2	139.7	600	240	36″ Leads	LDA00201

Optional Features:

Other wattages and voltages
Other diameters or lengths
1/8″, 1/4″, and 3/8″ NPT male or female threads are available for the inlet and outlet fittings
External MI cable thermocouple
Other custom made fittings or flanges
S/S cable or braid for lead wire protection
SJO cord

Heater Selection

To ensure maximum heater life, heater wattage must be calculated so that it is suitable for the desired air flow. To calculate wattage, determine the air flow and temperature rise required. The following relationship can be used to determine the wattage.

Wattage =	SCFM × Temperature Rise (°F)
	3

Table below shows the relationship between standard cubic feet per minute versus maximum watts per linear inch of heated length on different heater diameters.

Maximum Watts per Linear Inch of Heated Length
CFM	3/8″ Dia.	1/2″ Dia.	5/8″ Dia.	3/4″ Dia.
2	80	80	100	120
4	100	100	100	120
6	150	150	150	150
8	200	200	200	200
10	—	250	250	250
15	—	—	375	375
20	—	—	—	500

Note: Air heaters must always have air flowing through them and must operate in a horizontal position to balance the internal resistance coil. Air Heaters can be made in any practical length. These sizes can be adapted with many types of fittings.

HAC In-line forced air process heaters

Design Features:

Two standard sizes: 1/2″ diameter × 8″ long, 11/16″ diameter × 6″ long
304 Stainless Steel sheath
120 Volt only
Exit air or gas temperature up to 1400°F (760°C)
Inlet air or gas temperature up to 250°F (121°C)
Ceramic coil support and insulator
Three different terminations
Customized termination, inlet, outlet, and wattage to customer specification available

Heater Options

Type SL: Straight Leads

Type SA: Straight Air Inlet

Type NT: 90° Air Inlet | Barbed Fitting for 1/4″ ID Tube

Heater Construction

Daisy Wound Heating Element: This continuous wound heavy gauge high temperature alloy wire is supported on a custom designed ceramic insulator. This unique coil design rapidly and efficiently removes heat from the resistor wire to achieve higher air/gas temperatures than conventional coil wound designs. The coil assembly is enclosed a in stainless steel housing for safety and durability. Termination can be customized to suit your specific application. Consult Tempco with your requirements.