Insulation Removal Vacuum: CFM & Water Column — Two Important Measurements
Vacuum performance is figured by two measurements: Cubic Feet per minute (CFM) and water column rate. We measure the CFM to determine the quantity of air the vacuum is able to move. When you add fiber to the hose, the CFM will reduce by up to 50-60%.
So, we determine what overcomes that reduced rate. The water column measurement tells us the vacuum’s maximum pulling strength. Water column gets its name from a water-filled device originally used to measure water column. A measuring tube with inch gradients filled with water, connected to the vacuum would measure the rate. The greater the suction, the more inches the water would climb in the tube. This provides, in inches, the maximum pulling strength of the vacuum. Today, digital devices measure the water column rate. The higher the number in inches, the greater the suction.
VACUUM | CFM | WATER COLUMN |
---|---|---|
2,500 | 19" |
|
3,200 | 25" |
|
2,500 | 19" |
|
3,200 | 25" |
|
3,600 | 27" |
|
3,800 | 48" |
|
6,400 | 47" |
|
6,400 | 47" |