A vapor transfer cartridge comprising: a center tube extending along a first axis from a first end to a second end , having a continuous inner diameter throughout; a first header piece coupled to the first end of the center tube, the first header piece configured as a cap and comprising: a first channel about an inner circumference of the first header piece , the first channel accepting the first end of the center tube to couple the first header piece to the center tube , a first port providing a water inlet into the vapor transfer cartridge , and a baffle disposed inside the vapor transfer cartridge at the first port , a second header piece coupled to the second end of the center tube the second header piece configured as a cap and comprising: a second channel about an inner circumference of the second header piece , the second channel accepting the second end of center tube to couple second header piece to center tube , a second port , a first end cap coupled to the first header piece , the first end cap comprising a third port , a second end cap coupled to the second header piece , the second end cap comprising a fourth port ; and a plurality of fibers arranged inside the center tube along the axis of the center tube from the first end to the second end. a center tube extending along a first axis from a first end to a second end , having a continuous inner diameter throughout; a first header piece coupled to the first end of the center tube, the first header piece configured as a cap and comprising: a first channel about an inner circumference of the first header piece , the first channel accepting the first end of the center tube to couple the first header piece to the center tube , a first port providing a water inlet into the vapor transfer cartridge , and a baffle disposed inside the vapor transfer cartridge at the first port , a first channel about an inner circumference of the first header piece , the first channel accepting the first end of the center tube to couple the first header piece to the center tube , a first port providing a water inlet into the vapor transfer cartridge , and a baffle disposed inside the vapor transfer cartridge at the first port , a second header piece coupled to the second end of the center tube the second header piece configured as a cap and comprising: a second channel about an inner circumference of the second header piece , the second channel accepting the second end of center tube to couple second header piece to center tube , a second port , a first end cap coupled to the first header piece , the first end cap comprising a third port , a second end cap coupled to the second header piece , the second end cap comprising a fourth port ; and a second channel about an inner circumference of the second header piece , the second channel accepting the second end of center tube to couple second header piece to center tube , a second port , a first end cap coupled to the first header piece , the first end cap comprising a third port , a second end cap coupled to the second header piece , the second end cap comprising a fourth port ; and a plurality of fibers arranged inside the center tube along the axis of the center tube from the first end to the second end. <EOS>