HVAC question...

[Dom]

So, I was thinking...

Where head height on return pumps are the considered, as height increases, GPH flow decreases.

Is the same true with HVAC returns. Does the amount of air a return draws decrease as it gets further from the furnace?

 

[Kershaw]

Not necessarily. Hvac is measured in CFM and static pressure. Not head pressure. Things do have to be sized properly. If too small static pressure will get high and cause stress on blower motor.

 

[MarshallB]

There isn't head pressure, but there is static pressure. If there are more twists and turns in the duct work means more static pressure, or drag in other words.

 

[Kershaw]

Also in hvac. Supply is where air comes out and return is where air goes in. Just FYI.

 

[Pistondog]

So, I was thinking...

Where head height on return pumps are the considered, as height increases, GPH flow decreases.

Is the same true with HVAC returns. Does the amount of air a return draws decrease as it gets further from the furnace?

Yes, the distance increases the resistance to flow