Document jm1GE516NrBvmnjrVxV8dk2gk

258 CHAPTER 18 1960 Guide Worm Air Heating Systems GROUP 4. BOOT FITTINGS - FROM BRANCH TO STACK. 259 GROUP 5. STACK ANGLES. ELBOWS. ANO COMBINATIONS A ANO D HAVE 3" THROAT RADIUS RETURN AIR UNER TO DUCT. STUD SPACE TO LINER. SO <0. rl R.A. GRILL AND FITTING. R.A.CRILLTO STUD SPACE. R.A. GRILL ONLY. FLOOR GRILL TO LINER Fig. 7 .... Equivalent Length of Fittings and Intakes (Conducted)