Document Raprmznra8wMaMKR7kmxXgrvz

. '468 CHAPTER 20 Fio. 4.- Equivalent Length of Fittings GROUP 1. WARM AIR AND RETURN AIR BONNET OR PLENUM. ,1953 Guide' Forced ;Warm Air. Systems Fig; 4: Equivalent Length of Fittings (Continued). GROUP 4. BOOT FITTINGS;- FROM BRANCH TO STACK; 469 30'n.rt jj'nrt 60*10. ft 4Vcq.fi 70'cq. re 4Vco r 90'n. ft 55*cq. rt GROUP S. STACK ANCLES, ELBOWS, AND COMBINATIONS ^{ .5'to.rt 10'eo r 25'ro. ft 10'ce. rt WIDTH* IV . 14". m 20* WIDTH 40^, M- 55* (O'co ft I5*co. rt i, p * 10 X aW - 55* 12 X 3'A - 65 14 X 3 2 - 70 (iai a to x i k 75*. 12 X 3 5 - 65* . 14 X 3 4 90* 10*ca- rt 05'ca rt ture can be expected, in order to secure frequent operation of fans, drafts, and burn ers. The thermostat location should not be on an outside wall, in a bedroom, bath room, or sun room, or in a location where it will be affected by direct radiant heat from 60* (Q. rt "A. CftlLL ANO FITTING. R. A.CHIU. TO.STWO SPACt. R.A. GRILL ONLY. FLOOR GfttU. TO LI NCR the sun or from a fireplace, or by direct heat, from any warm air duct, register or chimney. 2. A fan switch control to start blower operations at air temperatures between 110 and 130 F, and to stop the blower at about 15 deg below the cut-in point. The lower