a filter housing adapted to mount between a surface mount substrate and a fluid device adapted to mount on the surface mount substrate, the filter housing having a plurality of flow paths and a filter cavity defined therein, wherein:

the filter cavity is defined to extend in a generally horizontal direction when the low-profile filter is in use;

a first flow passage is defined to connect an inlet at a first surface of the filter housing to a first section of the filter cavity; and

a second flow passage is defined to connect a second section of the filter cavity to an outlet at a second surface of the of the filter housing, wherein the first and second surfaces are on obverse sides of the filter housing; and

a pass-through flow passage having a first pass-through passage opening and a second pass-through passage opening, the pass-through passage running from the first surface of the filter housing to the second surface of the filter housing and bypassing the filter cavity, wherein the first inlet, first outlet, first pass-through passage opening and second pass-through passage opening are configured and spaced to interface with corresponding ports of the substrate and a single gas device; and

a filter assembly comprising a filter disposed in the filter cavity and sealed to the surface of the filter cavity separating the filter cavity into adjacent sections including the first section of the filter cavity and second section of the filter cavity.