Header pipe attachment

Bag filter apparatus having walls defining a filter compartment with an inlet for gas to be filtered and an outlet for the exhaust of clean gas therefrom, a tube sheet having a series of apertures therein lying between inlet and outlet driving the housing into inlet and outlet chambers, an open ended filter bag depending from each aperture of the tube sheet, cleaning means for said bag filters comprising a source of compressed air, a header pipe having an inboard end thereof carried by the housing adapted to receive compressed air from said source, an outboard end of the header extending into the outlet chamber of said housing parallel to the tube sheet and ending in spaced relation with a wall of said apparatus, said header pipe having openings therein that exhaust compressed air into the open ends of aligned filter bags, closure means at the outboard end of the header pipe adapted to preclude flow therethrough, support means carried by the housing adapted to limit expansion of said header to a longitudinal direction comprising a guide plate having a solid end fixed to the end of the header pipe and an end with an axially disposed slot extending outward therefrom into spaced relation with the housing wall, and means carried by the wall of the housing adapted to slidably abut the slot in the end of the guide plate to permit longitudinal movement therebetween.