Single-Wall, Flat Oval Duct

For applications in which space restrictions prohibit the use of round duct, McGill AirFlow offers flat oval duct in spiral lockseam and longitudinal seam constructions. Flat oval duct provides a more efficient alternative to rectangular duct in these applications. McGill AirFlow manufactures flat oval duct with the same techniques used to make round duct. As a result, flat oval duct shares many of the performance characteristics of round duct. Compared with rectangular duct, it provides lower installation costs and, because of reduced leakage and pressure loss, lower operating costs.

Single-wall, flat oval duct

Spiral lockseam duct is constructed with an interlocking helical seam that runs the length of the duct. As with round spiral lockseam duct, the flat oval type combines efficient performance with a structural strength equal to that of heavier gauges of other types of duct.

Flat oval duct is available with a longitudinal seam construction for applications that require very heavy gauges or large sizes. The duct's longitudinal seam is solid welded.

A pipelock construction is used for some lighter gauge duct (residential and light commercial) and some PVC-coated metal duct.


Flat Oval Duct
Available Lengths, Materials, and Thicknesses

Uni-Seal™ Duct
(spiral lockseam)
Lengths (1)
Materials (2,3)
Thicknesses
1-12
feet
Galvanized
Steel
28-18 gauge
Stainless
Steel
>26-20 gauge
Aluminum
0.025-0.063
inch

Longitudinal Seam Duct
(solid welded)
Lengths (1)
Materials (2,3)
Thicknesses
1-6
feet
Galvanized
Steel
20-10 gauge
Stainless
Steel
22-10 gauge
Aluminum
0.040-0.090
inch

(1) Some standard sizes of flat oval Uni-Seal duct are available only to lengths of 6 feet; longer lengths are available on special order. Standard lengths of flat oval longitudinal seam duct are 5 and 6 feet.

(2) Single-wall, flat oval duct is also available in nongalvanized carbon steel and paintable galvanized steel. Stainless steel is generally type 304 or 316. Aluminum is generally type 3003-H14. Uni-Coat® single-wall, flat oval duct (polyvinyl-chloride-coated galvanized steel) is available on special order.

(3) SilverGuard™ single-wall, flat oval duct (pre-coated with an antimicrobial) is available on special order.


Flat Oval Duct and Fittings—
Available Size Ranges

Minor Axis
(inches)
Major Axis (inches)
Minimum
Maximum
Spiral Lockseam
Maximum
Longitudinal Seam or Fitting Size
3
8
22
30
4
7
21
40
5
8
21
46
6
8
59
59
7
10
21
62
8
10
77
77
9
12
23
89
10
12
79
99
11
14
25
109
12
14
81
119
14
20
80
139
16
22
79
143
18
23
81
134
20
26
80
140
22
35
82
134
24
37
81
141
26
29
not available
137
28
31
not available
144
30
43
84
141
32
35
not available
139
34
37
not available
138
36
39
not available
136
38
41
not available
136
40
43
not available
143

UNI-GASKET fittings

 

 
McGill AirFlow's Single-Wall, Round and Flat Oval Duct and Fittings:

Single-Wall, Round Duct
Single-Wall, Round Lined Duct
Single-Wall, Round Fittings
Single-Wall, Flat Oval Duct
Single-Wall Flat Oval Fittings

 

 


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An enterprise of United McGill Corporation—Family owned and operated since 1951

Unless otherwise noted, all (™) trademarks and (®) registered trademarks are property of United McGill Corporation.

Products depicted were current at the time of publication. All product designs, specifications, and features are subject to change without notice.