Bypass Ventilator

A ventilator comprising a housing comprising a first flowpath extending from a first inlet to a first outlet, and a second flowpath extending from a second inlet to a second outlet. The housing further comprises a partition defining a first chamber therein. The ventilator further comprises a second chamber. The first flow path extends through the first chamber and the second chamber, and the second flowpath extends through the first chamber. The ventilator further includes a movable damper disposed in the first flowpath and configured to apportion a quantity of a first fluid flowing therein between the first and second chambers. The second chamber and the movable damper are configured in a removable part adapted to be fitted in place of a cover part of the housing of the ventilator.