[. . . ] TJERNLUND DRAFT CONTROLS A Series: Single Acting Deluxe Stainless Steel Control for Oil, Solid Fuel and Fan Assisted Gas Burners. B Series: Double Acting Standard Control for Gas Heating Appliances. The Problem: Heating appliances are designed to operate with a consistent draft. [. . . ] By diluting the chimney/vent draft with varying amounts of room air they maintain the draft at a heater's flue outlet within a consistent, safe and efficient range. Tjernlund venting products offer reliable performance, ease of installation and care-free maintenance . . . at an affordable price. TJERNLUND DRAFT CONTROLS General Description Series A This single acting deluxe unit is made of stainless steel for low maintenance and corrosion resistance. It has integral anchor points and selfaligning, self-centering rocker bearings for long lasting service. Adjustment is easily accomplished by moving counter weight on outside tab. Series B This quality engineered control is double acting for installation on gas fired appliances. It has many practical features including: self-aligning, self-centering rocker bearings, polished chrome adjustment knob, ultra-light sensitivity and rugged, galvanized construction. Application Tables SERIES A SINGLE ACTING FOR OIL, SOLID FUEL & FAN ASSISTED GAS BURNERS MODEL PIPE SIZE DC4* DC5 DC6 DC7 DC8 MODEL PIPE SIZE SERIES B DOUBLE ACTING FOR GAS DC4G DC6G DC7G DC8G DC9G DC10G 4'' 5'' 6'' 7'' 8'' 4'' 6'' 7'' 8'' 9'' 10'' *DC4 constructed of galvanized steel You Can Count On Tjernlund Venting Products With Confidence Since 1938, Tjernlund has built a solid reputation throughout North America for innovative products and venting solutions. Through four generations of family ownership, your complete satisfaction continues to be our primary focus. [. . . ] For further information on draft controls or other Tjernlund venting products, contact your heating supply distributor or Tjernlund Products: Draft Controls are available from: ® TJERNLUND PRODUCTS, INC. 1601 Ninth Street White Bear Lake, MN 55110-6794 Phone: 651. 426. 2993 800. 255. 4208 Fax: 651. 426. 9547 Visit our web site: www. tjernlund. com Copyright © 1999 Tjernlund Products, Inc. [. . . ]