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Heating Systems vnre. Jenkins Bros. 80 White Street, New York 13, N. Y. Bridgeport, Conn.; Boston, Philadelphia, Chicago, San Francisco, Atlanta - LOOK FOR THIS DIAMOND MARK Leading Supply Houses Everywhere Stock Jenkins Valves Jenkins VALVES for LIFETIME SERVICE FOR EVERY NEED JENKINS CATALOG LISTS OVER 500 VALVES Consult Jenkins Catalog for complete details on more than 500 different valves that cover practically all industrial plumbing ana heating, and engineering requirements. Below is a brief list. All-Iron Valves,--globe, angle, gate; Angle Valves,--bronze, steel, and iron body with bronze mounting or trimming. Blow-Off or Y Valves,--bronze and iron. Electrically Operated Valves, Gates, Globes, Angles, Fire Line Valves; Floor Stands; Foot Valves for gasoline service. Gate Valves,--bronze, iron, steel; with solid wedge or double disc parallel seats ; with removable bonnet and renewable bushing. Globe Valves,--bronze, iron and steel; one piece and union bonnets; renewable and integral seats; rubber composition or metal discs and plugs. Horizontal Check Valves,--bronze, iron and steel; Hose Valves; Indicator Posts; Lock Shield Valves. Needle Valves; Non-Return Valves; Quick-Opening; Self-Closing Valves* Radiator Valves; Rapid Action Valves; Regrinding Valves; bronze and iron body with bronze trimming; renewable plug seats and bevel seats of a special nickel alloy in globe, angle, check and swing check patterns. Selclo Valves; Stop and Check Valves,-- combination or automatic equalizing; Swing Check Valves,--bronze, iron and steel. Stainless Steel Valves,--globe, angle, gate and check. Underwriters* Pattern Valves,--check and gate; Whistle Valves; Waterworks Valves. Insulation Air Ducts. Screens Kaiser- Aluminum & Chemical Sales, Inc. 1924 Broadway Oakland 12, California KAISER ALUMINUM SHADE SCREENING WILL HELP YOU SELL MORE AIR CONDITIONING UNITS By means of tiny louvers set close to gether, Kaiser Aluminum Shade Screen ing reflects sun's rays, cuts room tem peratures by as much as 15 deg. Thus the load on air conditioning equipment is lessened--which reduces operating costs. Typical example of heat reduction with Kaiser Aluminum Shade Screening: Figuring 23 West windows 3M ft x 6 ft. Total area 3M ft x 6 ft x 23 = 463 sq ft taking a 3:00 PM peak load during midsummer at 40 deg latitude. Btu's Sun load passing through windows................ 82,200 Sun load passing through Shade Screen....... 8,220 Reduced by....................................................... 73,980 Refrigeration sayings: 6.15 tons Kaiser Aluminum Shade Screening can help bring the price of air conditioning units within the reach of almost every home, office or industrial building. Available in standard.window widths. Write today for free A J.A. file and name of nearest whole saler or applicator. DUCTS OF KAISER ALUMINUM DELIVER 5 TO 30 PER CENT MORE HEAT THAN DUCTS MADE OF OTHER MATERIALS Bare aluminum costs less thaifinsulated material--and still delivers the same heat output. The graph at right shows results of recent tests. It's evidence that ducts of bare Kaiser Aluminum can economically deliver more heat per Btu input than ducts of other materials. In addition, Kaiser Aluminum ducts mean a high qual ity installation at less cost. Write for free booklet that shows how duct installation costs can be lowered- -and fuel costs reduced for your clients--with Kaiser Aluminum 1379 S'