Document R2OXj2Le6Z2n8KJ4oQyDq7BNk

494 CHAPTER 19 WARM AIR AND RETURN AIR BONNET OR PLENUM. EQUIVALENT LENGTHS BASED DEPTH OF DUCT 1957 Guide Warm Air Heating Systems GROUP 4. BOOT FITTINGS - FROM BRANCH TO STACK. ac D 495 RETURN AIR ONLY 1 NOT RECOMMCNKO ANGLES AND ELBOWS FOR TRUNK DUCTS. INSIDE RADIUS '/ WIDTH.OF DUCT. EQUIVALEN T LENGTHS BASED ON 6" DEPTH OF DUCT ~ WIDTH- A TO 11 10 co. r 12 TO 2 I 15 * 22 TO 27 20 20 TO 52 * 25 WIDTH'. 4 TO 6 20 CO. 7 TO n AO 2 TO 15 55 16 TO 21 - 76 22T02T 100 20 TO 52 ' 125" A TO II 15 (0. rv <2 TO 21 - 20 22 TO 27. 25 20 TO 22 40 45 co rt 30 co. rt 35 co. n 5crt IS tc rt 15 co. rx 15 co. rt STACK ANGLES, ELBOWS, AND COMBINATIONS. A AND a HAVE 3* THROAT RADIUS D AND C HAVE 5* THROAT RaOIUS 5t. rt 5 to ft 10 co- 25 CO- rt IO' WIDTH 12* 14* (0 15 15 1CT WIDTH 40 12* - - 65 14' * 55 S . rt 10 co. rx 125 co. rt 10 X 3k > 60 12 X 3% - 75 14 X 3 - 75 cart 10 X 3 & 75 12 X 3 k - 00 14 X 3 & a 90 10 (Art 93 co rt GROUP 3 TRUNK DUCT TAKE-OFFS. D-3" THROAT RADIUS NOTE: f - NO RADIUS Q NOT RECOMMENDED Fig. 7. Equivalent Length of Fittings Fio. 7. Equivalent Length op Fittings (Continued)