Chiltrix Inc. www.chiltrix.com
To calculate the head pressure for the correct water flow, the pipe length must be measured and all fittings
counted. It is advisable to use flexible red oxygen barrier PEX piping and route it so as to avoid as many elbows as
possible.
All fittings have an equivalent length of pipe already calculated, available on the next page under PEX Fittings
Pressure Drops.
All measurements in feet
6 Tees @2.3ft. Of pipe = 13.8 ft. of pipe
7 Couplings @ 1.3 ft. of pipe = 11.7 ft. of Pipe
120’ of actual Pex Pipe
145.5’ of Pex @ 4.76 GPM and 10% Propylene Glycol
145.5’ x .05 = 7.02 ft of Head per length of pipe based on frictional losses
CXI 85 Fan Coils = 9.2 ft. of Head
Total Head = 16.2 ft.
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