Simple AC tips to help keep your cool this summer

[Dave Lane]

Originally Posted by Chief Roundup

This is not true. Duct is like a water line you are only going to get so much air through it.
Meaning you can't hook a piece of 10" duct right off the plenum box of a 5 ton unit and think it will blow just fine. 10" duct will not move that much air. The speed of the blower motor is ony in rpm's that the motor will turn. The speed will only affect the fps that the air will travel. Not the volume of air.

This is not true I have a 6" duct I move 1000 cfm through. It has an inline fan but you can move huge amounts of air through ducts if you want.

[Chief Roundup]

Originally Posted by Dave Lane

This is not true I have a 6" duct I move 1000 cfm through. It has an inline fan but you can move huge amounts of air through ducts if you want.

Dude you can think what you want but until you have been to school and educated yourself you will not understand. You can believe what you want but there is a huge difference between cfm and fps. You are moving are at 1000 fps but you CANNOT move 1000 cfm of air through a 6" round piece of duct.

fps = feet per second
cfm = cubic foot minute

When you mess up your system and it costs you 10k to replace it and they tell you that your duct is all blown apart and needs to be replaced for an addition 2500 to 3000. Maybe then you will understand.