The following table lists some patterns that are commonly used in HVAC systems, their corresponding CIDs, and sample images. For more information on the various methods that can be used to look up pattern numbers, see Finding Pattern Numbers CIDs.
The HVAC patterns listed below are organized into:
- HVAC - Rectangular
- HVAC - Round
- HVAC - Oval
- HVAC - Other
HVAC - Rectangular
| CID | Item Type | Description | Image |
| 1/35/36/866/948 | Duct | This pattern is used for HVAC ductwork. | 
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| 166 | Flex Duct | This pattern is used for HVAC flexible ductwork. | 
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| 802/958 | Cap | This pattern is used for a cap. | 
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| 2/942 | Transition | This pattern is used for a transition. | 
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| 8 | Rectangular to Round Transition | This pattern is used for a rectangular to round transition. | 
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| 956 | Shape Change | This pattern is used for a shape change item. | 
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| 6/955 | Mitered Offset | This pattern is used for a mitered offset. | 
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| 30 | Mitered Offset | This pattern is used for a mitered offset. | 
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| 9 | Radius Offset | This pattern is used for a radius offset. | 
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| 944 | Radius Offset | This pattern is used for a radius offset. | 
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| 7 | Tap | This pattern is used for a tap. | 
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| 947 | Flat Shoe | This pattern is used for a flat shoe. | 
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| 20/952 | Mitered Elbow | This pattern is used for a mitered elbow. | 
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| 3 | Mitered Elbow | This pattern is used for a mitered elbow. | 
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| 1155 | Mitered Elbow with Taper | This pattern is used for a mitered elbow with taper. | 
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| 4/943 | Radius Elbow | This pattern is used for a radius elbow. | 
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| 17/953 | Reducing Radius Elbow | This pattern is used for a reducing radius elbow. | 
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| 1122 | Reducing Radius Elbow | This pattern is used for a reducing radius elbow. | 
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| 5/945 | Radius Tee | This pattern is used for a radius tee. | 
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| 13/954 | Straight Tee | This pattern is used for a straight tee. | 
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| 14/946/1130 | Breech Piece | This pattern is used for a breech piece. | 
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| 37/1121 | Drop Check Breeches | This pattern is used for a drop check breech. | 
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| 1131 | Dividing Junction 2 Way | This pattern is used for a 2-way dividing junction. | 
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| 18/950 | Side Branch | This pattern is used for a side branch. | 
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| 1153 | Tee Reducing | This pattern is used for a reducing tee. | 
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| 1154 | Breech Reducing | This pattern is used for a reducing breech. | 
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| 10/951 | 3 Wye | This pattern is used for a 3 wye. | 
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| 1120 | Dividing Junction 3 Way | This pattern is used for a 3-way dividing junction. | 
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| 847 | Junction 3-Way | This pattern is used for a 3-way junction. | 
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| 848 | Junction 2-Way | This pattern is used for a 2-way junction. | 
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| 849 | Junction Twin Bend Type 1 | This pattern is used for a Type 1 twin bend junction. | 
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| 1124 | Junction Twin Bend Type 2 | This pattern is used for a Type 2 twin bend junction. | 
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| 1125 | Junction Twin Bend Opposed | This pattern is used for a junction with twin bends that are opposed. | 
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| 1126 | Junction Twin Bend Type 2 | This pattern is used for a Type 2 twin bend junction. | 
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| 1127 | Junction Two-Way with Square to Round | This pattern is used for a two-way square to round junction. | 
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| 1128 | Junction Two-Way with Taper | This pattern is used for a two-way tapered junction. | 
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| 1129 | Straight with Splitter (Decoiled) | This pattern is used for a straight with splitter (decoiled). | 
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| 1179 | Junction Reducing Two-Way | This pattern is used for a reducing two-way junction. | 
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HVAC - Round
| CID | Item Type | Description | Image |
| 49/940 | Round Duct | This pattern is used for round ductwork. | 
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| 873 | Flex Duct | This pattern is used for flex ductwork. | 
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| 60 | Cap | This pattern is used for a cap. | 
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| 533 | Coupling | This pattern is used for a coupling. | 
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| 51/1200 | Concentric Transition | This pattern is used for a concentric transition. | 
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| 71 | Eccentric Transition | This pattern is used for an eccentric transition. | 
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| 24/1203 | Flat Shoe (Tap) | This pattern is used for a flat shoe (tap). | 
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| 871 | Curved Boot | This pattern is used for a curved boot. | 
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| 875 | Saddle | This pattern is used for a saddle. | 
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| 866 | Conical Saddle | This pattern is used for conicle saddle. | 
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| 61/1201 | Segmented Elbow | This pattern is used for a segmented elbow. | 
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| 523 | Radius Elbow | This pattern is used for a radius elbow. | 
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| 95 | Reducing Segmented Elbow | This pattern is used for a reducing segmented elbow. | 
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| 1202 | Straight Tee | This pattern is used for a straight tee. | 
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| 47 | Lateral Tee | This pattern is used for a lateral tee. | 
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| 52 | Reducing Tee | This pattern is used for a reducing tee. | 
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| 899 | Segmented Branch | This pattern is used for a segmented branch. | 
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| 100 | Breeches | This pattern is used for breeches. | 
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| 821 | Twin Bend | This pattern is used for a twin bend. | 
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| 808 | Shoe Tee/Shoe Cross | This pattern is used for a shoe tee/shoe cross. | 
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| 44 | Press Cross | This pattern is used for a press cross. | 
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| 938 | Segmented Cross | This pattern is used for a segmented cross. | 
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HVAC - Oval
| CID | Item Type | Description | Image |
| 165 | Oval Duct | This pattern is used for oval ductwork. | 
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| 121 | Cap | This pattern is used for for a cap. | 
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| 163 | Transition | This pattern is used for a transition. | 
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| 104 | Rectangular to Oval Transition | This pattern is used for a rectangular to oval transition. | 
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| 123 | Oval to Round Transition | This pattern is used for an oval to round transition. | 
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| 1522 | Coupling | This pattern is used for a coupling. | 
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| 111/113 | Mitered Offset | This pattern is used for a mitered offset. | 
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| 154 | Conical Tee | This pattern is used for a conical tee. | 
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| 106/108 | Segment Elbow | This pattern is used for a segmented elbow. | 
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| 118 | Straight Tee | This pattern is used for a straight tee. | 
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| 825 | Twin Bend | This pattern is used for a twin bend. | 
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| 115 | Saddle Tee | This pattern is used for a saddle tee. | 
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| 114 | Lateral Tee | This pattern is used for a lateral tee. | 
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| 377/831 | Lateral Cross | This pattern is used for a lateral cross. | 
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HVAC - Other
| CID | Item Type | Description | Image |
| 19/382/956/1145 | Plenum Box | This pattern is used for a plenum box. | 
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| 1136/1138 | Hood | This pattern is used for a hood. | 
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| 996 | Grill Box | This pattern is used for a grill box. | 
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| 530 | Round Diffuser | This pattern is used for a round diffuser. | 
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| 505 | Louver | This pattern is used for a louver. | 
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| 501/535 | Rectangular Fire Damper | This pattern is used for a rectangular fire damper. | 
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| 509 | Round Fire Damper | This pattern is used for a round fire damper. | 
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| 533/555/556 | Round Damper | This pattern is used for a round damper. | 
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| 507/514/914 | Rectangular Hamper with Handle | This pattern is used for a rectangular hamper with a handle. | 
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| 504 | Rectangular Access Panel | This pattern is used for a rectangular access panel. | 
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| 580 | Round Access Panel | This pattern is used for a round access panel. | 
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| 518 | Rectangular Heater Battery | This pattern is used for a rectangular heater battery. | 
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| 519 | Rectangular Attenuator | This pattern is used for a rectangular attenuator. | 
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| 521 | Equipment | This pattern is used for general equipment. | 
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| 913 | Fan | This pattern is used for a fan. | 
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| 838, 1238 - 1250 | Basic & Other Hangers | These patterns can be used for a variety of hangers, including basic, stirrup, strap, clevis, and more. See Hanger Patterns Help topic. | 
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| 388 | Roof Scoop | This pattern is used for a roof scoop. | 
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| 77 | Roof Hood | This pattern is used for a roof hood. | 
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