Retrotec USACE User Manual
Page 267
Appendix D D137
D.7.10.9 Poor Exhaust Hood Design Results in Heat, Grease, and
Smoke/Vapor Spillage or in Increased Exhaust and Makeup Air
Flow Rates (Ineffi ciency)
Figure D225. Canopy hood with no air fl ow restriction (top), hood with end panels (bottom).
Poor exhaust hood design, inadequate exhaust rates, and cross-drafts can cause
appliance effl uent plume spillage, which increases heat load on the facility space
and increases air conditioning costs. End panels can cheaply and effectively miti-
gate these problems. Used during a kitchen’s design phase, end panels can allow
for lower exhaust rates, which in turn deliver fan energy savings (Figure D225).
D.7.10.10 Single-Island Canopy Hood over Kitchen Equipment
(Ineffi ciency)
A single-island canopy hood (Figure D226) requires more fan energy for air
transportation. Additionally, a signifi cant amount of energy is used for makeup
air heating, cooling, and transportation.