Spring Air Systems Hood Model Number Designations; Principle Of Operation - Spring Air Systems DN REV-LOW Maintenance And Operating Manual

SPRING AIR SYSTEMS HOOD MODEL NUMBER DESIGNATIONS

There are numerous types and styles of SPRING AIR SYSTEM Rev-Low ventilator available.
Refer to the UL/ULC label for the complete model number and exhaust flow requirement for your
dry ventilator. The UL/ULC label is located on the underside of the grease through on the right
hand side of the dry ventilator.
SPRING AIR SYSTEMS HOOD MODEL NUMBER DESIGNATIONS
D Dry Grease Extractor
N No exhaust fire damper
D Fusible link, dead weight fire damper
B-F Box type rev-low hood
MG Make up air through front grilles
MP Make up air through perforated panels
MC Make up air down discharge through perforated
MR Make up air through rear wall plenum
10 The length of the ventilator in feet
4 The width of the ventilator in feet

PRINCIPLE OF OPERATION

A commercial kitchen cooking line consists of many different appliances depending on the type of
restaurant or institution. In every commercial kitchen the cooking vapors that comprise of grease,
smoke, and products of combustion rise
off the cooking surface.
convection forces drive the cooking
vapors up towards the back wall as
shown in figure 2. The kitchen dilution
air is entrained into the cooking vapors
and the air mixture generally follows the
profile of the back and top of the hood.
The mixture of grease, smoke, products
of combustion, lint, dirt and kitchen
dilution air proceed along the roof of the
hood and follow a path down towards
the core extractor slot
extractor slot extends along the length
of the hood). Most of the air mixture
enters the slot and a small amount rolls
back into the hood canopy to meet the
main air stream again.
Optimizing the amount of air mixture that enters the core extractor slot is the key to the REV LOW
system. The REV LOW hood must incrementally maximize the amount of the air mixture that
enters the slot and minimize the amount of roll back into the canopy as the total amount of the air
mixture deviates along the length of the cooking lineup.
Model Number Designation - Ventilators
Chart No1
Natural
Back wall of hood
Optional 3" aiir space
(the core
The REV LOW Hood Model DN-B-F
DN-Rev-LOW Maintenance and Operating
D N B-F MP
Exhaust Air
Roof of hood
Vapours from appliances
APPLIANCES
Figure 2
Manual
10 4
Core Extractor
Variflow baffle
Front of hood
Kitchen dilution air
2