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Slip-in Mounting and Flanged

Electric duct heaters can be installed in several forms, but the most popular are slip-in and flanged mounting. This following article will give you a basic understanding if you want to compare and contrast these two.

Existing ducts

For existing ducts and retrofits, flanged mounting like that available on the HEATREX QUZ model is usually preferred.
A cut of the right width, with proper planning and care, can be made in the older ductwork with enough metal left over to
form four flanges. These flanges are bent into place around the perimeter of the duct on both sides of the cut. Using bolts or sheet metal screws the heater is mounted. For larger heaters, additional bracing can be installed, if necessary.

New Construction

For new construction, however, a hole is simply cut in the side of the duct and the heater simply slides into the pre-fabbed hole. To hold the heater in place, sheet metal screws are used with additional bracing as required. The process can also be applied to fiberglass ducts provided sheet metal liner – extended in to the duct at least 6″ on both sides of the heating elements-is used to protect the fiberglass material. The HEATREX QUA model is and excellent slip-in option in these cases in particular, for open coil applications especially. Finally either of these electric duct heater options can be custom-built for any-size duct or any unusual placement or installation.

For more information about the installation of our electric duct heaters – flange or slip-in mounting – please visit us online at HEATREX.com or call us directly at (800)394-6589.

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