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Duct Construction Standards: 2" Water Gauge

Material: Galvanized

Sealer: Joint Connections
Seams: 24-26 ga. Snaplock, 18-22 ga. Pittsburgh

D Drive (24 ga.)	SD Standing Drive (22 ga.)	S S-lock (24 ga.)	SS Standing S-lock
TDC Transverse Duct Connector	IRA Intermediate Reinforcing Angle	MPT Midpoint Tie Rod	JTR Joint Tie Rod

Duct Size	Gauge	Connection Joint			Reinforcement
		Centers	Major	Minor
10" & dn	26	59"	S	D	None
11" - 14"	26	59"	SS	SD	None
15" - 20"	24	59"	SS	SD	None
21" - 30"	24	56"	TDC	TDC	None
31" - 36"	22	56"	TDC	TDC	None
37" - 42"	24	56"	TDC	TDC	MPT
43" - 54"	22	56"	TDC	TDC	MPT
55" - 84"	22	56"	TDC	TDC	JTR (2)MPT
85" - 96"	20	56"	TDC	TDC	JTR (2)MPT
97" - 120"	18	56"	TDC	TDC	JTR/MPT/IRA (2 1/2 x 1/8)

(1) Based upon 1995 SMACNA HVAC Duct Construction Standards.
(2) Install tie rods (JTR & MPT) at 60" spacing for ducts over 120" wide.
(3) All duct beaded or crossbroken.
(4) Fittings and duct reinforced alike.
(5) JTR's required on both sides of joint.
(6) Refer to job specifications for specific sealer requirements.

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