Pumps
| Diaphragm pump (+) low cost, (+) very quiet, (-) cause vibration, (-) not very robust, not suitable for 24/7 operation | 1D 1 lpm diaphragm pump | 2D 2 lpm diaphragm pump | 3D 3 lpm diaphragm pump | Gear pump (+) very robust, (+) little vibration, (+) high pressure head, (-) higher cost, (-) noisy | 1G 1 lpm gear pump | 2G 2 lpm gear pump | 3G 3 lpm gear pump | 3 lpm gear pump with reduced speed (+) low noise, (+) very robust, (+) little vibration, (+) high pressure head, (-) higher cost | 3G10 gear p. reduced speed to 1 lpm | 3G20 gear p. reduced speed to 2 lpm | | Centrifugal pump (+) quiet, (+) very robust, (+) 1C very little vibration, (++) 1CL lowest vibration, (+) low cost, (-) flow depends on system pressure | 1C 1 lpm centrifugal pump | 1CL 1 lpm low pres. centrifugal p. | | Fans
| Standard, quiet and variable speed fans | standard fan 63dBA | QF quiet fan 60dBA | VS variable speed fan 49 dBA |
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