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Air Conditioning 1 National Heater Company /) 2180 Cleora Avenue St. Paul 4, Minnesota Engineered for industry--space heating, tempering mahe up air. and drying NATIONAL CHAMPION HEATERS 200,000 to 2,000,000 Btu Direct fired for oil, gas, or combination units GUARANTEED 80 PER CENT OPER ATING EFFICIENCY -- in factories, foundries, warehouses, garages, hangars, terminals and many other installations. SAVE ON OPERATION -- National Champion Heaters circulate warm air at working levels, keep roof heat loss at a minimum. Low initial cost--no boiler house or power piping required. Lo* operating cost--standby- losses elimi nated, no licensed attendant needed! SAVE ON FUEL--National Champion Heaters burn fuel only when-zone ther mostats call for heat. Burner shuts off when temperature is attained. No fuel wasted to. overcome transmission losses. No wasteful recycling to maintain steam pressure or water temperature. MODEL H Available tn ceilxng suspended, inverted and portable units SAVE ON MAINTENANCE--National Champion Heaters feature simplified burner and controls and easily acces sible clean-out plates--no problem to maintenance personnel. Spare parts are readily available. TESTED CONSTRUCTION -- Features SAVE ON INSTALLATION--National high chrome nickel stainless steel combus Champion Heaters save 30 per cent to tion chamber, in efficient teardrop design. 70 per cent over systems requiring ex Structure welded into rugged, one-piece pensive ductwork, piping, condensat steel unit with baked enamel exterior lines, traps, pumps, etc. Units are finish. Engineered for dependable, en shipped completely wired, assembler* during service. Underwriter's laboratories and name-tested at the factory to guaran listed. tee peak performance. Ah Conditioning National Heater Company 2180 Cleora Avenue St. Paul 4, Minnesota Efficient heat exchange, high velocitydischarge develop truly economical- space heating. 1. When thermostat calls for heat, in duced draft blower starts first to purge combustion chamber and establish draft before burner is fired. 2. Main blowers--separate from induced draft blowers--start only when proper bonnet temperature is attained. 3. Cool air is drawn through louvered panels at floor level. 4. Air passes over National's stainless steel teardrop combustion chamber and then around multiple banks of econo mizer tubes. = htL , .. ,,> ./Alter tills full Uniform heating, air discharges at high velocity from adjust- able heads atop the heater. Cutaway view of the National Champion Model H shows air flow from floor intake to adjustable discharge fleade- ' , ePan*te blower integral with burner, j seParate induced draft blower, are rnlrten0^^diustable for maximum combustion efficiency. RESULT: No "cold blasts" on start-up; proper, uniform heating of air; high velocity discharge keeps warmed air at working levels; minimum temperature differential between floor and roof. Underwriters' Laboratories Listed Heater dumber ~|53T TD-25 TD-30 TO-40 TD-S0 TD-70 TD-SO TD-loo TO-125 JO-150 TD-175 TD-20O WRITE FOR DESCRIPTIVE BROCHURE! Btu Output Capacity 200,000 250,000 400,000 500,000 750,00u 800.000 1.000,000 1.250,000 1.500,000 1.750,000 2.000,000 CFMat H in. S.P. 2,400 3,200 4,000 5,400 6,600 8,800 10,200 12,500 15,300 10,400 22,000 26,000 HP Blower Motor H H H 1 1H 2 3 5 5 7H 7H 10 1265 Overall Dimensions Width 28 28 32 32 32 32 48 48 54 54 60 60 Length 52 52 GO GO 80 80 80 so 100 100 120 120 Height 66 66 81 81 81 81 81 81 98 98 98 98 Shipping Weight 950 1020 1400 1500 1750 1900 2400 2600 3200 3450 4150 4300