a connecting tube 18 to the inlet tube 14 thence through the manifold 10 and the apertures 12 the manifold 10 forms the rear member of a generally rectangular frame comprised additionally of connected side members 20 and 22 and a front cross member 24 the frame is supported above the hearth of the fireplace by legs 42 positioned at the four corners of the rectangular frame the front cross member 24 includes a series of keyed apertures 26 which are aligned with respective apertures 12 of manifold 10 air flow conduits 28 connect between respective manifold apertures 12 and keyed apertures 26 conduits 28 are hollow tubes having a restricted outlet orifice 30 as defined by a reduced forward cross section of the conduit 28 the reduced forward cross section of the conduit 28 also includes upwardly and downwardly extending key members 32 and 34 which cooperate respectively with the keyed aperture 26 to maintain alignment or conduits 28 a retaining bar 36 attached by fasteners 38 to the front frame member 24 cooperates with slots 40 in the key member 32 of each conduit 28 to retain the conduits 28 aligned and generally immovable within the frame andirons 44 are also retained on the frame by means of the fasteners 38 which retain the retaining bar 36 the andirons 44 prevent material such as the synthetic logs from accidentally falling from the frame and out of the front of the fireplace andirons 44 are also a decorative.