13
AIR FROM OTHER INDOOR SPACES
FIGURE 9E.
The confined space should be provided with two permanent
openings, one commencing within 12 inches (300 mm) of the top
and one commencing within 12 inches (300 mm) of the bottom of
the enclosure. See Figure 9E.
Each opening should communicate directly with an additional
room(s) of sufficient volume so that the combined volume of all
spaces meets the criteria for an Unconfined Space.
Each opening should have a minimum free area of 1 square inch
per 1,000 Btu/hr (1100 mm
2
per kW) of the aggregate input rating
of all appliances installed in the enclosure. Each opening should
not be less than 100 square inches (645 cm
2
).
Summary of Contents for VF VB 500
Page 3: ...3 GENERAL SAFETY...
Page 30: ...30 Wiring Diagram FIGURE 17 CONNECTION DIAGRAM...
Page 31: ...31...
Page 32: ...32 FIGURE 18 SCHEMATIC DIAGRAM VB VW 500 750 1000 SCHEMATIC DIAGRAM...
Page 36: ...36 LIGHTING OPERATION INSTRUCTIONS FOR MODELS VB VW 500 750 AND 1000...
Page 48: ...48 notes...
Page 49: ...49 notes...
Page 50: ...50 notes...