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Flat Oval Spiral Pipe & Fittings for Commercial or Industrial HVAC systems

Sheet Metal Connectors, Inc. flat oval single wall duct and fittings are one part of
our complete line of HVAC products. Flat oval duct has been designed for restricted
space conditions that cannot accept round spiral duct. Flat Oval Spiral Pipe is
fabricated in spiral lock seam or longitudinal welded construction. Applied end treatments can be E-Z flange with barrel clamp, or standard slip connection. Refer to the chart below for specific oval duct sizes, materials, gauges, and lengths.

Flat Oval Spiral Pipe Catalog & Specs

Flat Oval Construction



Flat oval is for positive pressure applications only. See Sheet Metal Connectors, Inc. recommended size and gauge chart below.



Flat Oval Construction

Flat oval is for positive pressure applications only. See Sheet Metal Connectors, Inc. recommended size and gauge chart below.



Flat Oval Connections

E-Z Flange with Barrel Clamp

The E-Z flange with barrel clamp can be factory installed or shipped loose for field installation. A set consists of two E-Z flanges and one barrel clamp. For field installation the installer attaches the E-Z flange to the pipe and fittings. Next the installer applies the gasket to one flange, mates the two flanges together and attaches the barrel clamp. Sheet Metal Connectors, Inc. also installs E-Z flanges. Flanges are fastened and internally sealed on both ends of spiral pipe and fittings.



Standard Spiral Pipe Connector

Pipe to Pipe connections are made by using a fitting size coupling that slips inside the mating pipe sections, as shown below. A stop bead runs around the middle of the coupling to center the coupling in the connection. Secure the connection by installing sheet metal screws through the outer shell of the duct, 1/2 inch from the stop bead.

Flat Oval Spiral Pipe

Flat oval ducts of all sizes shall be manufactured from Sheet Metal Connectors spiral pipe with the following gauges, unless otherwise specified.

Vane Chart

For mitered elbows and tees use the following chart if vanes are required.



The drawings shown on the following pages are illustrative of the types of fittings manufactured. SMC does not recommend deviation from these drawings.



Fittings