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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