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ROLOK PRODUCTS
4800 N. Channel Ave.
Portland, OR 97217

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Duct Construction Standards: 6" Water Gauge


Material: Galvanized

Sealer: All Joints & Seams
Seams: 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
12" & dn 24 59" S D None
13" - 24" 22 56" TDC TDC None
25" - 26" 20 56" TDC TDC None
27" - 38" 20 56" TDC TDC JTR
29" - 30" 22 56" TDC TDC IRA (1 1/2 x 1/8)
31" - 36" 20 56" TDC TDC IRA (1 1/2 x 1/8)
37" - 48" 20 56" TDC TDC IRA (1 1/2 x 1/8)
49" - 54" 20 56" TDC TDC IRA (1 1/2 x 1/8)
55" - 72" 18 56" TDC TDC IRA (1 1/2 x 1/8)
73" - 96" 18 56" TDC TDC JTR/MPT (Note 7)
97" - 120" 18 56" TDC >TDC JTR/MPT/IRA (2 1/2 x 3/16) Note 7

(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. (7) MPT/IRA required (24" spacing along length of duct).

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