Ventilation

1690D Heater

In-Line Heater — 70,000 BTU

An aluminum-housed, propane-fired in-line heater that mounts directly to the 1325D Axial Ventilator, converting your blower into a forced warm-air heating system. Delivers 70,000 BTU of heat through the existing duct — no separate blower needed if you already run the 1325D.

All Models
1690D

In-Line Heater — 70,000 BTU — Aluminum Housing

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1690D-Heater

Requires the 1325D Axial Blower

The 1690D is an in-line heater — it mounts to and draws power from the Model 1325D blower. It cannot operate independently. If you don't already have a 1325D, order both together.

70,000 BTU · Forced Air · Propane

Warm Forced Air. Through Your Duct.

When winter fieldwork demands more than passive heat, the 1690D converts your 1325D ventilator into a full forced-air heating system. Propane-fired at 70,000 BTU — more than four times the 1557 infrared tent heater — the 1690D pushes heated air through your existing ductwork and into the work space. CSA and CEESI certified. Aluminum housing. Available in both North American (120V/60Hz) and European (230V/50Hz) voltages.

70,000 BTU propane output — powerful forced warm-air heat for large tents and confined spaces
70,000 BTU propane output — powerful forced warm-air heat for large tents and confined spaces
In-line design — mounts to the 1325D, heats the air that the blower is already moving
In-line design — mounts to the 1325D, heats the air that the blower is already moving
Aluminum housing — durable, lightweight, corrosion-resistant
Aluminum housing — durable, lightweight, corrosion-resistant
CSA + CEESI certified — meets North American workplace safety standards
CSA + CEESI certified — meets North American workplace safety standards
Remote Thermostat Control available (Model 1625) — optional temperature management
Remote Thermostat Control available (Model 1625) — optional temperature management
10′ LPG hose included — propane line to tank
10′ LPG hose included — propane line to tank
Available in North American and European voltages (50Hz)
Available in North American and European voltages (50Hz)
Optional thermostat assembly (1620/1625) for remote temperature control
Optional thermostat assembly (1620/1625) for remote temperature control

1690D Specifications

Model
1690D
Power
120 VAC · 1 amp
Fuel
Propane (LPG)
BTU Output
70,000 BTU
Propane Usage
2.25 lbs./hr
Housing
Aluminum
Dimensions
13.5" W × 18.5" L × 15.25" H
Weight
30 lbs.
Included
10′ LPG hose
Voltage Options
120V/60Hz (NA) · 230V/50Hz (European)
Certifications
CSA + CEESI
Required Blower
Model 1325D (not included)
System Setup

1690D + 1325D = 639 CFM Warm Air

The 1690D bolts directly onto your 1325D blower. The blower draws air; the 1690D heats it. Together, they deliver warm forced air through your existing ductwork.
1690

1690D

This Product · Heater

In-Line Heater
70,000 BTU · Propane

1325D
1325D_1400D

1325D

Required · Blower

Steel Axial Ventilator
120 VAC · 1,004 cfm

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Compatible Accessories

Thermostats, Hoses & Regulators

Extend and control your 1690D system with optional thermostat control, additional hose assemblies, and regulator options.
1625_HeaterPlug

1620 - Thermostat Assembly

Thermostat assembly for heater with 25’ cord

1620 - Thermostat Assembly
1625_HeaterPlug

1625 - Thermostat Assembly

Thermostat assembly for heater with 6’ cord

1625 - Thermostat Assembly
109191-001

109191-001 - 20' Hose Assembly

Hose assembly 1/4” x 20’ with 9/16” threaded fittings

109191-001 - 20' Hose Assembly
109191-001

107607-001 - 10′ Hose Assembly

Hose assembly 1/4” x 10’ with 9/16” threaded fittings

107607-001 - 10′ Hose Assembly
RegulatorAssembly

1590-FB - Regulator Assembly with Full Flow POL

Regulator assembly - LPG, with full flow POL (reg. preset to 10 PSI)

1590-FB - Regulator Assembly with Full Flow POL
1590-FB

1590-F - Regulator Filter Assembly with Excess Flow POL

Filter/Regulator/Gauge. The POL Excess Flow Valve will shut down fuel flow to down-stream equipment in the event of a regulator fire or ruptured hose.

1590-F - Regulator Filter Assembly with Excess Flow POL
Required & Related Products

Other Ventilation Solutions

1325D_1400D

Required: Steel Axial Blower — Model 1325D

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Required: Steel Axial Blower — Model 1325D
infrared-heater

Infrared Tent Heater — 1557 Series

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Infrared Tent Heater — 1557 Series
steel-axial-blower-canister

Steel Axial Blower with Canister

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Steel Axial Blower with Canister
thermoplastic-axial-blower-canister

Thermoplastic Axial Blower with Canister

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Thermoplastic Axial Blower with Canister

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