MIL-HDBK-1003/3
Page
6.1
Duct Design for HVAC Systems...............
46
6.1.1
Sizing General.............................
46
6.1.2
Equal Friction Method Sizing...............
46
6.1.3
Ductwork General...........................
46
6.1.3.1
Round Ducts................................
46
6.1.3.2
Rectangular Ducts..........................
46
6.1.3.3
Access Doors...............................
48
6.1.3.4
Flexible Ducts.............................
48
6.1.3.5
Rooftop Ductwork...........................
48
6.1.3.6
Glass Fiber Ductwork.......................
48
6.1.3.7
Balancing Dampers for HVAC.................
48
6.1.3.8
Fire Dampers and Smoke Dampers.............
50
6.1.3.9
Fan Systems Effect Factors.................
51
6.1.4
Ductwork Details...........................
51
6.1.4.1
Branches...................................
51
6.1.4.2
Elbows.....................................
51
6.1.4.3
Offsets and Transmissions..................
51
6.1.5
Testing and Balancing......................
51
6.2
Fans for HVAC Systems......................
51
6.2.1
Fan Selection..............................
51
6.2.1.1
Major Types of HVAC Fans...................
51
6.2.1.2
Size.......................................
51
6.2.1.3
Sound Rating...............................
52
6.2.1.4
Static Pressure Requirement................
52
6.2.1.5
VAV Fan Selection..........................
59
6.3
Economizer Cycle...........................
59
6.4
Terminal Equipment.........................
59
6.5
Louvers....................................
60
6.6
Filters for VAV Systems....................
60
6.7
Access for Inspection and Maintenance......
61
6.8
VAV System Design..........................
62
6.9
Ductwork Pressure-Velocity Classification..
62
7.1
General....................................
65
7.1.1
Piping Design Factors......................
65
7.1.2
Pipe Friction Loss.........................
65
7.1.3
System Pressure Loss.......................
65
7.1.4
Piping Layouts.............................
65
7.1.5
Expansion..................................
65
7.1.6
Expansion Loop.............................
66
7.1.7
Packing-Type Expansion and Ball Joints.....
66
7.1.8
Bellows Expansion Joints...................
66
7.1.9
Supports and Anchors.......................
66
7.1.10
Flexible Hose..............................
68
7.2
Water Systems..............................
69
7.2.1
General....................................
69
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