Document 8QR0Rwz6b06yO05zpn7Yz0EK

Ah Conditioning SSL DRAVO CORPORATION HEATER DEPARTMENT 300 Penn Avenue, PITTSBURGH, PA. Sales Offices in Principal Cities Cut away view showing combustion chamber principles as applied to gas, oil, or combination gas and oil burning units. Note corrugated combustion chamber with fins and deflectors welded thereto for maximum heat transfer efficiency. Econ omizer tubes utilize part of the heat of the flue gases. Heated air is discharged at top, return air taken in at floor level, a practice that concentrates heated air at working levels. Savings of scarce . metals, fuel, cost of maintenance and cost of labor in operation are factors influencing favorable accept ance of Dravo Heaters. . War conditions demand speed of installatiorVand curtailment in the use of critical materials. Dravo Heaters are shipped with refractory and firewall in place, are installed by simply connecting to fuel and power supply, and their construction represents a saving in critical metals of 30 to 40 per cent over conventional steam plants with distributing systems. Each heater is a self-contained unit, operated individually. A heating system for any size structure may be formed with a combination of one or more heaters. Dravo Direct-Fired Heating Systems save man-hours, money, transportation--all essential to the war effort. Dravo Direct-Fired Heaters are used for permanent installation and also often used to supply temporary heat in new con struction or plant expansion. The exceptionally high heat transfer efficiency is the result of two fundamental design features--first, accurately controlled combustion of fuel and air, and second, highly effective transfer of heat to air. Standard stock sizes are obtainable for production of 650,000 to 4,000,000 Btu output per hour. Dravo Bulletin Nb. 505 with detailed description mailed on request. Specification Data Sheets for any type or capacity are furnished on request. GAS-OIL COMBINATION . . . Floor Set . . . Top Discharge . . . Rear Fired, . . . Standard V-Belt Drive--This series of heaters is equipped to burn either Heavy or Light oil with alternate gas burner. Equipment consists of a complete, separate burner for each fuel, each burner having a com plete set of con trols. The con trols and wiring are so arranged that either burn er can be put into operation by simply throwing a switch. GAS . . . Floor Set . . . Top Discharge ... Rear Fired . . . Standard V-Belt Drive--This series as well as all others is designed to deliver the maximum output per square foot of floor space occupied. Because of their unique design they fit into the heated space and are depend able and efficient. They readily lend themselves to a wide variety of applica tions, using either natural or manu factured gas. 908 Dravo Corporation Air Conditioning. D^`-rFlLdeHe2tJrs. There are 47 Branch and Sales offices stragetically located to extend quick co operation on heating problems. Right. Hopper fed model, capac ities 1,000,000 to 4,000.000 Btu output per hour. Also available for bin-feed. Anthracite or Bitu minous coal. COAL FIRED SERIES --the Dravo coal-fired, self-contained Heater is particularly adaptable in areas where coal is the cheapest or easiest fuel to obtain. Coal fired heaters may be con verted to either gas" or oil firing should con ditions change. The entire series of Dravo Direct-Fired Heaters has the utmost flexibility. Enough applica tions, combinations, and adaptations are available to meet any set of reasonable con ditions. The same unique principle of corrugated welded combustion chamber, with its multiplicity of welded fins and deflectors, is employed. The entire series has the DRAVO non-clinkering air-cooled setting incorporated in the design. Avail able for either bituminous or anthracite coal; equipped with either hopper feed or bin-feed stoker, installed under either end of the heater. Capacities: 1,000,000 to 4,000,000 Btu per hour output. There are two models of Dravo DirectFired Coal Heaters specially designed for large unit applications which can be used as central heating plants. Overhead or underground duct systems may be installed when necessary. These large models are available in ratings from 4J^ to 8 million Btu output per hour. Specification Data Sheets for any type or capacity are furnished on request. OIL, Floor Set, Top Discharge, Front Fired Standard V-Belt Drive--This series obtainable in light oil or heavy oil fired models in all Dravo Direct-Fired Heaters. Econ omy of fuel con sumption is the result of careful over-all designing and constant im provement over many years. In summer they may be used for air cir culation. COAL . . . Hand Fired Model--Avail able for bituminous coal or coke. Equip ped with full set of rocking and dumping, grates, supporting frame and lugs; under grate blower assembly; shaker bar and handle; lower ashpit front; door and frame. Available in ratings of 1,000,000 to 4,000,000 Btu per hour output capacity. Convertable at any time to bin or stoker feed, gas or oil con sumption. 909