Subbase for hot air furnace

Claim 1

A SUBBASE FOR SUPPORTING A HOT AIR FURNACE ON THE FLOOR OF A STRUCTURE TO BE HEATED WHEREIN HOT AIR IS DISTRIBUTED VIA A SUBFLOOR DUCT AND COMBUSTION AIR AND MAKEUP AIR ARE OBTAINABLE FROM AN EXTERIOR SOURCE BENEATH THE FLOOR, SAID SUBBASE COMPRISING A BASE ADAPTED TO RECEIVE THE FURNACE THEREON ANDHAVING A MARGINAL FLANGE ADAPTED TO REST ON SAID FLOOR AROUND THE PERIPHERY OF AN OPENING IN SAID FLOOR OVER SAID SUBFLOOR DUCT, SAID BASE HAVING A HORIZONTAL TOP PANEL DISPOSED ABOVE SAID FLANGE AND CONNECTED THERETO BY AN UPRIGHT WALL. SAID PANEL HAVING AN OPENING THEREIN, COLLAR BEING LOCATED BY SAID TOP PANEL AND EXTENDING VERTICALLY DOWNWARDLY THEREFROM THROUGH SAID PANEL OPENING FOR CONNECTION WITH AN OPENING IN THE SUBFLOOR DUCT, SAID COLLAR BEING LOCATED FOR REGISTRY WITH THE HOT AIR OUTLET OF SAID FURNACE FOR CONDUCTING HEATED AIR FROM THE FURNACE DOWNWARDLY THROUGH SAID BASE INTO THE SUBFLOOR DUCT, SAID PANEL HAVING AN APERTURE LOCATED FOR VERTICAL ALIGNMENT BENEATH THE BURNER OF THE FURNACE, A COMBUSTION AIR DUCT FOR SUPPLYING COMBUSTION AIR TO THE BURNER VIA SAID PANEL APERTURE COMPRISING AN IMPERFORATE TROUGH OPEN AT THE TOP THEREOF, CLOSED AT ONE END AND OPEN AT AN AXIALLY OPPOSITE END AND BEING SECURED TO SAID PANEL BENEATH SAID APRETURE AND EXTENDING THEREALONG, BAFFLE MEANS SECURED TO THE OPEN END OF SAID TROUGH AND DEFINING WITH SAID TROUGH PANEL AND WALL A CHAMBER COMMUNICATING WITH THE OPEN END OF SAID TROUGH, COMBUSTION AIR TUBE MEANS SECURED TO SAID BASE AT THE BOTTOM OF SAID CHAMBER AND HAVING AN AIR TUBE COMMUNICATING WITH SAID CHAMBER AND ADAPTED TO EXTEND DOWNWARDLY THEREFROM THROUGH SAID FLOOR OPENING TO A SOURCE OF FRESH AIR EXTERIOR TO SAID STRUCTURE, AND A FRESH AIR TUBE DEPENDENT FROM SAID BASE ADAPTED TO EXTEND DOWNWARDLY THROUGH SAID FLOOR OPENING TO A SOURCE OF FRESH AIR EXTERIOR TO SAID STRUCTURE SAID FRESH AIR TUBE COMMUNICATING AT ITS UPPER END WITH THE REGION DEFINED BENEATH SAID PANEL, INTERIORLY OF SAID WALL AND EXTERIORLY OF SAID COLLAR MEANS AND SAID COMBUSTION AIR DUCT, SAID WALL HAVING PORT MEANS FOR DIS CHARGING FRESH AIR FROM SAID REGION INTO THE SPACE ADJACENT THE UPRIGHT WALLS OF THE FURNACE.