MIL-HDBK-1003/3
Table 5
Safety Factor Chart
Ventilator Type
Multipliers
Backshelf
1.05
Passover
1.15
General All-Purpose
Wall Mount: End Closed
1.05
End Open
1.20
Island Style:
Single
1.50
Double
1.30
Table 6
Duty Group Chart
Group
Range
Standard Air Volume
(cfm/ft)
(cfm/ft)
Light Duty
0 to 150
150
Standard Duty
151 to 250
250
Heavy Duty
251 to 300
300
Extra Heavy Duty
301 to 400
400
3.18.5
Exhaust Hood Heat Recovery. Heat recovery for kitchen
exhaust hoods should only be considered for commercial size
kitchen when life cycle cost effective and when building design
cannot meet the energy budget. Manufactured heat recovery
modules for commercial size kitchen hoods are available. These
modules typically use a heat pipe method of heat recovery, but
several configurations are available. Also, heat exchanger
equipment should be located at ground level for easy access to
inspect, maintain, and remove for shop cleaning. The key
variable for heat recovery feasibility is hours of operation. An
intermittently used exhaust may not have sufficient operating
hours for heat recovery to be cost effective.
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