October 2013
Intermediate to advanced
306 pages
12h 17m
English
Content preview from Estimating for Heating and Ventilating, 3rd Edition
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54 SPECIFICATION AND DRAWINGS
Rectangular ducts
Length of longer side
Thickness
of metal
Circular ducts
Diameter
Thickness
of metal
in mm
mm B.G. in mm
mm B.G.
up to 24 up to 600
0-6
24
up to 20 up to 500 0-6 24
over 24 over 600
over 20
up to 30
over 500
up to 750
0-8
22
and up
to 40
and up
to 1000
0-8
22
over 30
up to 50
over 750
up to 1250
10
20
over 40
and up
to 90
over 1000
and up
to 2 250
10
20
over 50
up to 100
over 1250
up to
2
500
1-2
18
Compiled from The Specification for Sheet Metal Ductwork
DWJ12L
by permission
of The Heating And Ventilating Contractors Association. (See list of recommended
publications in Appendix A.) ...
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