BLOWER SIZING
Horsepower
| HORSEPOWER | |||
| To Get This | Divide This | By This | |
| Horsepower | Kwatts | 0.746 | |
| Horsepower | Watts | 746 | |
| Horsepower | Torque (ft. lbs.) X RPM | 33000 | |
| Horsepower | Torque (ft. lbs.) X RPS | 550 | |
| Horsepower required to pump water at a given rate to a given Height,assuming 100% eff. AKA Water | GPM x TDH (ft.) | 3960 | |
| Horsepower | GPH X TDH (psi) | 103000 | |
| Brake HP | Water HP | Pump eff. |
Air blower sizing guide
| BLOWER MOTOR SIZE | VOLTS | AMPS | MAXIMUM INCHES OF WATER DEPTH | JETS ONLY RECOMMENDED NUMBER OF JETS |
| 1 HP | 120V | 6.6 | 35 in. | 5 to 10 |
| 1-1/2 HP | 120V | 7.4 | 45 in. | 9 to 15 |
| 2 HP | 120V | 9.3 | 55 in. | 12 to 17 |
| 1 HP | 240V | 3.9 | 30 in. | 4 to 9 |
| 1-1/2 HP | 240V | 4.3 | 40 in. | 8 to 13 |
| 2 HP | 240V | 5 | 50 in. | 12 to 17 |
Blower sizing formula
| Measure total depth of water in spa (not total spa depth) |
| Add - 1 in. water for each 10 ft. of 2 in. air pipe Add 1/2 in. water for each 90 deg. 2 in. elbow |
| Compare your total with maximum inches of water column and select that size or the next size higher blower than your total, in your selected voltage. |
| The number of holes in the air channel (both floor and seat) should be approximately 1.6 sq. in. total plus or minus .5 |
| 1/8 in. hole = .0123 sq. in. 3/16 in. hole = .0276 sq. in. |
| 5/32 in. hole = .0192 sq. in. 1/4 in. hole = .0491 sq. in. |
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