SHEET METAL STANDARDS
DUCT GUAGE AND ENFORCEMENT FOR 4” ESS AND DRIVE (+/-)
SHEET METAL STANDARDS
DUCT GUAGE AND ENFORCEMENT FOR 6” ESS AND DRIVE (+/-)
NOTES
1.
TDC DUCT CONSTRUCTED PER SMACNA STANDARDS - FIRST EDITION 1995
2.
DUCT FABRICATED USING PITTSBURG SEAMS
3.
ALL DUCT STIFFENED BY MACHINE FORMED BEADS SPACEDAT 12”O.C.
4.
DUCTWORK TO BE SEALED PER SMACNA HVAC TABLE 1-2
5.
TDC CNT-JNT-CONDU-LOCAT
TDC CONNECTOR CENTER OF DUCTANDAT TDC CONNECTOR
GAUGE OF METAL
DUCT
DIMENSIONS
5’
JOINT
4’
JOINT
2.5’
JOINT
2’
JOINT
JOINT CONSTRUCTION
REINFORCING
0-8”
24
24
24
24
HEMMED “S”AND DRIVE
NONE
9-22”
24
24
24
24
TDF
NONE
23-30”
24
24
24
24
TDF
NONE
31-36”
20
22
24
24
TDF
NONE
37-42”
24
24
24 NO
CNT. REF
24 NO
CNT. REF
TDF
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
43-48”
22
22
22 NO
CNT. REF
22 NO
CNT. REF
TDF CNT - JNT
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
49-60”
22
22
22 NO
CNT. REF
20 NO
CNT. REF
TDF CNT - JNT
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
61-72”
20
20
20 NO
CNT. REF
20 NO
CNT. REF
TDF CNT - JNT
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
73-84”
18
18
18 NO
CNT. REF
20 NO
CNT. REF
TDF CNT - JNT
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
85-96”
20
2 SETS
CNT. REF
20
20
20 NO
CNT. REF
TDF CNT - JNT
1 ½WIDE X 1 ½ HEIGH
16GA V-TYPE STIFFENER
97”AND UP
18
18
18 NO
CNT. REF
18 NO
CNT. REF
TDF CNT - JNT 48”MAX SPACING
1 ½WIDE X 1 ½ HEIGH
16GA V-TYPE STIFFENER
GAUGE OF METAL
DUCT
DIMENSIONS
5’
JOINT
4’
JOINT
2.5’
JOINT
2’
JOINT
JOINT CONSTRUCTION
REINFORCING
0-8”
24
24
24
24
HEMMED “S”AND DRIVE
NONE
9-12”
24
24
24
24
TDF
NONE
13-22”
22
24
24
24
TDF
NONE
23-24”
22
22
24
24
TDF
NONE
25-28”
20
22
24
24
TDF
NONE
29-36”
24
24
24 NO
CNT. REF
24 NO
CNT. REF
TDF
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
37-42”
22
22
22 NO
CNT. REF
22 NO
CNT. REF
TDF
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
43-48”
20
20
20 NO
CNT. REF
20 NO
CNT. REF
TDF
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
49-60”
20
20
20 NO
CNT. REF
22 NO
CNT. REF
TDF CNT - JNT
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
61-72”
18
18
18 NO
CNT. REF
20 NO
CNT. REF
TDF CNT - JNT
1 ½WIDE X 1 ½ HEIGH
18GA V-TYPE STIFFENER
73-96”
18
2 SETS
CNT. REF
18
18
20 NO
CNT. REF
TDF CNT - JNT 48”MAX SPACING
1 ½WIDE X 1 ½ HEIGH
16GA V-TYPE STIFFENER
97”AND UP
18
2 SETS
CNT. REF
18
18
18 NO
CNT. REF
TDF CNT - JNT 48”MAX SPACING
1 ½WIDE X 1 ½ HEIGH
16GA V-TYPE STIFFENER
