Double-Wall, Round and Flat Oval Duct

Double-Wall, Flat Oval Fittings

A complete line of fittings designed for low leakage and efficient performance is available for use with McGill AirFlow’s double-wall, flat oval duct. Each fitting is sized accurately to allow easy field assembly. Fittings are available in solid welded, spot or tack welded and sealed, lap and riveted (or screwed) and sealed, and standing seam constructions.

Double-wall, flat oval fittings

Double-Wall, Flat Oval Fittings
Available Materials, and Thicknesses

ACOUSTI-k27® Fittings (3) (spot or tack welded and sealed, lap and riveted/screwed and sealed, solid welded, or standing seam)
Materials (1,4)	Thicknesses (2)
Galvanized Steel	26-10 gauge
Stainless Steel	26-10 gauge
Aluminum	0.032-0.090 inch (2)

(1) Double-wall, flat oval duct and fittings are also available in carbon steel, paintable galvanized steel, types 304 and 316 stainless steel, and type 3003-H14 aluminum.

(2) Aluminum double-wall, flat oval duct and fittings are available in larger sizes and greater thicknesses on special order.

(3) Fittings made from 16-gauge (Aluminum - 0.090 inch) or heavier are fully welded.

(4) SilverGuard™ double-wall, flat oval duct and fittings (pre-coated with an antimicrobial) are available on special order.

Double-Wall, Flat Oval Duct and Fittings—
Available Size Ranges

Minor Axis, Inner Liner (inches)	Major Axis, Inner Liner (inches)
	Spiral Lockseam						Longitudinal Seam
	Minimum			Maximum			Minimum	Maximum
	Insulation Thickness			Insulation Thickness
	1 inch	2 inch	3 inch	1 inch	2 inch	3 inch
3	8	8	8	19	19	17	22	30
4	7	7	7	21	21	21	23	40
5	8	8	8	21	19	19	24	46
6	8	8	8	59	59	59	na	na
7	10	10	na	21	21	na	23	62
8	10	10	11	77	77	74	na	na
9	12	na	na	23	na	na	26	89
10	12	13	13	79	76	73	84	99
11	na	na	na	na	na	na	14	109
12	18	17	17	78	75	75	78	119
14	20	20	20	77	77	74	84	139
16	22	22	29	79	76	76	85	143
18	24	31	31	78	78	75	87	134
20	33	33	na	80	77	na	85	140
22	35	na	na	79	na	na	84	134
24	not available (na)						37	141
26							29	137
28							31	144
30							33	141
32							35	139
34							37	138
36							39	136
38							41	136
40							43	143


	Acoustical Benefits Thermal Benefits Mechanical Benefits

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

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