Document YDv3pNe2bxxDgG18VJ7O51krN

502 CHAPTER 19 WARM A1R.AND .RETURN AIR BONNET OR.PLENUM., EQUIVALENT LENGTHS BASED DEPTH OF DUCT OEPTH MIN -1958 Guide Warm Air Heating Systems GROUP 4. BOOT FITTINGS - FROM' BRANCH TO STACK. ` 503 RETURN AIR ONLY . I NOT RECOMMENDED ANGLES and ELBOWS FOR TRUNK DUCTS. i'nsidC RA0U$ EQUIVALENT LENGTHS QASCD ON 8' DEPTH OF DUCT width.OF ( WIDTH'-1 4 TO l ! I* TO 27a 1C .26 TO 32*1! 4 TO *0 re- rr. 12 TO 2 I 15 * WI0TM'.. 4 TO6 - 20 10. 7 TOII . 40 12 TO15 * 55 14 TO21 - 74 22 TO27 - 100 25 TO 32 125" 4 TO II IS JO.r 12 TO 21 20 22 TO 27* 25 25 TO 32 40 GROUP 3. TRUNK DUCT TAKE-OFFS GROUP S. STACK ANGLES, ELBOWS. AND COMBINATIONS. A ANO 6 HAVE 3" THROAT RAOIUS D AND E HAVE 5" THROAT RAOIUS % I (ft rt 10 (t ri 25 to. - IS 14- 10 X 3ii 60 12 X 3% - 75 M X 3 - 7S ta t. 10 X 3 i 7J 12 X.3 - 00 14 X 3 - 90 GROUP 6 RETURN AIR ' lOco-nL- 0-3* THROAT RADIUS NOTE: F - NO RADIUS Q NOT RECOMMENDED Fig. 7. Equivalent Length of Fittings A. CRtLL ANO riTTINC. R. A. GRILL TO STUD SPACE. R.A. GRILL ONLY. floor criu. to liner Fig. 7. Equivalent Length of Fittings (Continued)