Rinnai 4500 - Manuel (Page 11)

Rinnai Corporation ROF4500 11
LPG Cylinder Enclosure
Enclosures for LP-gas supply cylinders shall be ventilated by openings at the level of the cylinder valve and at
floor level. This shall be accomplished by one of the following:
A. One side of the enclosure shall be completely open; or
B. For an enclosure having four sides, a top and a bottom:
1. At least two ventilation openings at cylinder valve level shall be provided in the side wall, equally sized,
spaced at 180 degrees, and unobstructed. Each opening shall have a total free area of not less than 1/2
square inch per pound (3.2 sq.cm/kg) of stored fuel capacity and not less than a total free area of 10
square inches (64.5 sq. cm).
2. Ventilation openings shall be provided at floor level and shall have a total free area of not less than 1/2
square inch per pound (3.2 s.cm/kg) of stored fuel capacity and not less than a total free area of 10
square inches (64.5 sq.cm). If ventilation openings at floor level are in a side wall, there shall be at least
two openings. The bottom of the openings shall be at floor level and the upper edge no more than 5
inches (127 mm) above the floor. The openings shall be equally sized, spaced at 180 degrees and
unobstructed.
3. Every opening shall have minimum dimensions so as to permit the entrance of a 1/8 inch (3.2 mm)
diameter rod.
Cylinder valves shall be readily accessible for hand operation. A door on the enclosure to gain access to the
cylinder valves is acceptable, provided it is non-locking and can be opened without the use of tools.
There shall be minimum clearance of 2 inches (50.8 mm) between the lower surface of the floor of the LP-gas
supply cylinder enclosure and the ground.
Minimum of 5” (12.7 cm) from
floor to top of bottom opening
Minimum of 2” (5 cm) from
floor bottom to ground level
Top openings at valve level
Each opening shall have a total free area of not less
than 1/2 square inch per pound (3.2 sq.cm/kg) of
stored fuel capacity and not less than a total free
area of 10 square inches (64.5 sq. cm).