Flanged Electric Duct Heaters

Flanged Electric Duct Heaters

Flanged electric duct heaters are designed for secure mounting to ductwork using a bolted flange connection. This mounting style is commonly used in commercial and industrial HVAC systems where a fixed, permanent installation is required.

They are typically used in engineered duct systems or to replace an existing flanged duct heater where the mounting style must match.

What “Flanged” Means

A flanged duct heater mounts to the duct using a perimeter flange that bolts directly to a matching duct flange.

  • Provides a secure, rigid installation
  • Matches existing flanged heater configurations for replacement
  • Common in built-up and custom duct systems

Flanged refers only to how the heater is mounted, not how it heats the air.

Available Configurations

  • Wide range of kW capacities
  • Standard voltages (208V, 240V, 480V)
  • Single-phase and three-phase options
  • Custom duct sizes and flange dimensions

Units are typically configured to match the application or existing heater.

Flanged vs. Slip-In

  • Flanged heaters bolt directly to the duct for a fixed installation
  • Slip-in heaters insert into the duct and are often used for retrofit or easier field installation

When replacing a heater, matching the mounting style is critical.

Fast Shipping + Expert Support

NorthStock supplies configured electric duct heaters for commercial and industrial applications, with fast shipping and knowledgeable support.

We help customers:

  • Match existing flanged heaters
  • Select correct configurations
  • Quote custom heaters quickly

Frequently Asked Questions (FAQ) – Flanged Electric Duct Heaters

  1. What are the typical applications for these heaters? They are primarily used in commercial and industrial HVAC systems, including engineered ductwork, make-up air units, air handlers, and custom or built-up duct systems. They excel in applications requiring precise temperature control for large air volumes, such as process heating, ventilation, or replacement of existing flanged units.

  2. What sizes, voltages, and capacities are available? These heaters are custom-built (e.g., Warren Custom Built CBK series) to match specific requirements. They support a wide range of kW capacities, standard voltages like 208V, 240V, and 480V, and both single-phase and three-phase configurations. Duct sizes and flange dimensions are tailored to the application or existing setup.

  3. How are flanged electric duct heaters installed? Installation involves positioning the heater between sections of flanged ductwork and bolting the perimeter flange securely in place. For added strength on larger units, duct flanges may be doubled, and hangers or supports may be required. Always ensure proper airflow direction, uniform velocity across the heater face, and compliance with local codes (e.g., NEC, ASHRAE, NFPA 90A). Professional selection and installation by qualified HVAC technicians is required.

  4. What are the key installation requirements and precautions?

    • Maintain minimum distances downstream from fans, transitions, filters, or obstructions to ensure even airflow and prevent nuisance tripping of safety limits.
    • Ensure adequate airflow: Never energize without proper airflow to avoid damage.
    • Orientation: Typically for horizontal airflow (check labels for vertical options).
    • Electrical: Use appropriate wiring, include fan interlock if no airflow switch is present, and follow NEC guidelines.

  5. What safety features are included? Standard features often include automatic reset and manual reset thermal safety limits, airflow interlocks (or requirements for fan interlock wiring), and compliance with UL/ETL listings. Custom options may add SCR controls, disconnect switches, or additional protections.

  6. Can these heaters be used for replacements? Yes, they are commonly selected to match existing flanged configurations for direct replacement. Provide exact duct dimensions, voltage, kW needs, and flange details for a precise match.

  7. What maintenance is required? Periodic checks include inspecting for airflow restrictions, ensuring electrical connections are tight, verifying no damage to elements, and cleaning if needed (especially in dusty environments). Never operate without airflow. Refer to the specific unit's manual for detailed maintenance schedules.

  8. How do I get a quote or custom configuration? NorthStock specializes in custom flanged electric duct heaters with fast shipping and expert support. Request a quote by providing your flanged duct heater requirements below!

Warren Custom Built (CBK) Electric Duct Heaters Are Available In Flanged Configuration And Manufactured To Your Exact Specifications

 Please request a quote for a flanged CBK duct heater below.

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