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HVAC Plan Symbols

Each engineering office uses their own set of symbols; however, the symbols below are fairly common across many offices.  Refer to the symbol sheet for special symbols used in a particular set.

Supply and Return Airflow


 Standard 4-way Diffuser

Standard 4-Way Blow Diffuser

 3-Way Diffuser

3-Way Blow Diffuser

 2-Way Diffuser2-Way Diffuser

2-Way Blow Diffuser

1-Way Diffuser

1-Way Blow Diffuser

 Return Grille

Return Grille

 Supply Flow Direction

Direction of Supply Air

 Direction of Return Air

Direction of Return Air

 Door Undercut

Door Undercut Size

Door Louver

Door Louver with Clear Area

 

 Volume Damper

Volume Damper

 Fire Damper

Fire Damper

 Smoke Damper

Smoke Damper

 Combination Smoke and Fire Damper

Combination Smoke and Fire Damper

 Backdraft Damper

Back-draft Damper

HVAC Piping

 Chilled Water Supply

Chilled Water Supply

 Chilled Water Return

Chilled Water Return

 Hot Water Supply

Hot Water Supply

 Hot Water Return

Hot Water Return

 Vent Pipe

Vent Pipe

 Drain Pipe

Drain Pipe

 Make-Up Water

Make-Up Water Pipe

 

Sensors

 Thermostat

Thermostat

 Humidity Sensor

Humidity Sensor

 

 


 


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