Combustion Air Horizontal; Combustion Air Vertical; Figure 53. Outside Combustion Air Supply - Calcana SR Series Specifications, Installation, Operation Service And Spare Parts Manual

SR-SERIES

COMBUSTION AIR HORIZONTAL

HORIZONTAL
FRESH AIR INTAKE HOOD
4" (10.2 cm)
40,000 – 80,000 input
6" (15.3 cm)
100,000 – 200,000 input

COMBUSTION AIR VERTICAL

VERTICAL
40,000 – 150,000 Btu/hr input
MAXIMUM LENGTH IS 45' (13.7m)
MINUS EXHAUST VENT LENGTH.
DEDUCT 10' (3m) FOR EVERY 90°
ELBOW USED AND 5' (1.53m) FOR
EVERY 45° ELBOW USED.
MAXIMUM LENGTH IS 30' (9.1m). TOTAL LENGTH OF HEATER
110' (33.6m). SHORTEN DUCT LENGTH BY 10' (3m) FOR EVERY
90° ELBOW USED AND 5' (1.53m) FOR EVERY 45° ELBOW USED.
36" (92cm) MAXIMUM
FLEXIBLE DUCT LENGTH

Figure 53. OUTSIDE COMBUSTION AIR SUPPLY

54
175,000 – 200,000 Btu/hr input
INCLUDING THE LENGTH OF OUTSIDE COMBUSTION AIR
(INTAKE) DUCT AND EXHAUST VENTING IS NOT TO EXCEED