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Air Conditioning DRAVO CORPORATION HEATING SECTION Dravo Bldg., Fifth and Liberty Avenues PITTSBURGH 22, PA. DRAVO Gat-Fired Dravo "Covnterflo" Direct Fired Heater DIRECT-FIRED HEATERS offer All these Important Advantages: LOW FIRST COST . . . Users report savings of 33-66 per cent over standard wet-type systems. WORKING-ZONE WARMTH . . . Units heat areas of 4000 to 20,000 sq ft each. Warmth is concen trated in working zone; roof heat loss greatly re duced. _ NO FUEL WORRIES . . . Burn gas or oil--readily converted from one to other. LOW OPERATING COST . . . 80-85 per cent effi ciency at bonnet plus top efficiency in heat distribu tion holds costs down. AUTOMATICALLY CONTROLLED . .. On-off or modulating controls. The heater looks after itself --no continuous attention required. EASY INSTALLATION . . . Just hook up fuel, electric and exhaust connections--the heater is ready to go. STAINLESS STEEL CHAMBER . . . Rugged milltype construction, top-drawer engineering, assure durability. 5 FUNCTION SERVICE . . . Each unit can provide not only comfort heating, but year-round ventila tion . . . tempered make-up air . . . process drying . . . and heat curing. TESTED-APPROVED ... AGA and/or UL seal on all standard units. Each heater flame-tested at factory before shipment. The Dravo Counterflo Direct-fired Heater textile and woodworking plants; schools, "manufactures" heat right where it is churches, college buildings, etc. Current tp be used, provides low-cost, depend users include some of the biggest names able, automatic "working-zone" in industry. warmth, without duct-work for indus trial or commercial buildings with large open areas. Users report savings of from Dravo Counterflo Heaters are available for firing with gas or oil. Gas or oil-fired 33-66 per cent over wet-type systems. Ideal for replacement as well as for new construction installations; mount in any position, on floor, wall or ceiling. Suc models are readily convertible from one to other, and coal-fired models are adapt able for gas or oil-firing. Unit capacities range from 400,000 to 6,000,000 Btu per cessfully serving in automobile and air hour output. See tables for external di craft manufacturing plants,construction mensions, weights and capacities of each industries, chemical, metal working, size. 1096 Air Conditioning%. DRAVO CORPORATION Pittsburgh Cleveland Philadelphia Detroit New York Chicago Atlanta Boston Sales Representatives in Principal Cities Manufactured and sold in Canada by Marine Industries, Ltd., Sorel, Quebec Heater Number SO 75 100 125 150 175 200 Btu Output Capacity 400.000 500.000 750.000 1,000,000 1.250.000 1.500.000 1.750.000 2.000.000 - ENGINEERING DATA Air at 70 Deg. Free Delivery *8Rr 4500 5500 8500 11000 14000 17000 19000 22000 | Temp. Rise 1 Deg. F 82 84 82 84 83 82 85 84 - HP n 2 3 5 ,5* 15 20 No. Discharge Nozzles 3 3 4 4 4 4 4 '4 Approx. Shipping Weight 1400 1500 2500 2600 3400 3600 4200 Heater Number 40 50 75 100 125 150 175 00 * U1SL CONSUMPTION--Minimum of 80 per cent Heater Efficiency A**tmeri Light Oil GPH 140,000 Btu Heavy Oil GPH 148.000 Btu oa GasCFH 1000 Btu Gas 3.5 3.5 500 4.5 6.7 8.9 11.1 13.4 15.6 17. fi 4.3 625 6.5 940 8.6 1250 10.8 1560 13.0 1875 15.0 2190 17.2 2500 5 FUNCTION SERVICE WITH JUST ONE UNIT! COMFORT HEATING Fast, economical heating of entire . working-zone provides ideal com fort conditions. YEAR-ROUND VENTILATION Maintains positive circulation of clean, ^fresh air--improves hot weather plant conditions. TEMPERED MAKE-UP AIR Ideal for foundries, paint spray booth and similar applications; re places contaminated air with fresh tempered make-up air. PROCESS DRYING Process applications include drying of ceramics, paint, hay, rugs, rub ber toys, and many other items. HEAT CURING The efficient design permits use for low temperature curing. Approximate Overall Dimensions Width Ft.-In. 2--6 3--7 3--7 4--2 4-2 4--8 4--9 ! Length Ft.--In. 5--1 5-1 7- 5 9-1 9--1 9-S 9--8 Height to top of Nozzles Ft.-In. 8--3 8--3 9--11 9--11 11--2 11-2 12--9 12--9 Write for descriptive Bulletin HVA-52350 and specification sheets. Address Heating Section, DRAVO CORPORA TION, Room 703, Dravo Building, Pittsburgh 22, Pennsylvania. Cutaway view of Dravo "Counterflo" Heater showing the stainless steel combustion chamber and the extended flame travel within the chamber which results in effici ency cif30 to 85 per cent burning gas or oH. 1097