Spring Air Systems REV-LOW DN-B-F User Manual

REV-LOW Hood

Dry Extractor

Box Canopy

DN-B-F

General Description

The REV-LOW hood is used on all single row cooking
equipment lineups, wall mounted. The unit is ceiling
hung with a recommended mounting height of 6'-6"
(1981 mm) from the lower edge of the canopy to the
floor. The ventilator is installed with the core
extractor section over the cook’s head. The hood is
finished with a number 4 finish on exposed sides. The
REV-LOW hood is available with fluorescent or
incandescent lights wired to a J-box.

Efficiency

The REV-LOW hood is a revolutionary idea in
commercial kitchen ventilator design. The REV-LOW
allows the exhaust flow to be field adjusted from
90cfm/ft to 450cfm/ft over each appliance without
affecting the overall efficiency of the ventilator. Your
kitchen will exhaust the lowest minimum required
anywhere to ventilate the appliances located under the
hood. After your kitchen is complete, appliances can
be Relocated, Added, or Removed from under the
hood! It’s a simple adjustment to fine-tune your

Dead Weight
Fire Damper

Model DN-B-F

Patent No.

5,540,214

ventilator to provide excellent smoke capture with
maximum grease extraction.

Exhaust and Supply

The REV-LOW hood exhaust calculations are outlined
in the REV-LOW Engineering Manual. The complete
kitchen ventilation system must be balanced, such that
a minimum of 80% continuous heated makeup air is
provided through dedicated makeup air systems or the
kitchen A/C units. It is good engineering practice to
provide this heated fresh air into the kitchen space.
The heated fresh air should not exceed 90 percent of
the total exhaust volume.

REV LOW Exhaust Volume Vs Exhaust Duct Size

Exhaust

Volume

CFM l/s W x L

450 212 10 x 4 254 x 102 3500 1652 10 x 33.5 254 x 851
500 236 10 x 4.5 254 x 114 3625 1711 10 x 34.5 254 x 876
625 295 10 x 6.0 254 x 152 3750 1770 10 x 36.0 254 x 914
750 354 10 x 7.0 254 x 178 3875 1829 10 x 37.0 254 x 940
875 413 10 x 8.0 254 x 203 4000 1888 14 x 27.0 356 x 686
1000 472 10 x 9.5 254 x 241 4125 1947 14 x 28.0 356 x 711
1125 531 10 x 10.5 254 x 267 4250 2006 14 x 29.0 356 x 737
1250 590 10 x 12.0 254 x 305 4375 2065 14 x 30.0 356 x 762
1375 649 10 x 13.0 254 x 330 4500 2124 14 x 30.5 356 x 775
1500 708 10 x 14.0 254 x 356 4625 2183 14 x 31.5 356 x 800
1625 767 10 x 15.5 254 x 394 4750 2242 14 x 32.5 356 x 826
1750 826 10 x 16.5 254 x 419 4875 2301 14 x 33.0 356 x 838
1875 885 10 x 18.0 254 x 457 5000 2360 14 x 34.0 356 x 864
2000 944 10 x 19.0 254 x 483 5125 2419 14 x 35.0 356 x 889
2125 1003 10 x 20. 254 x 508 5250 2475 14 x 36.0 356 x 914
2250 1062 10 x 21.5 254 x 546 5375 2537 14 x 36.5 356 x 927
2375 1121 10 x 22.5 254 x 572 5500 2596 14 x 37.5 356 x 953
2500 1180 10 x 24.0 254 x 610 5625 2655 14 x 38.5 356 x 978
2625 1239 10 x 25.0 254 x 635 5750 2714 14 x 39.0 356 x 991
2750 1298 10 x 26.0 254 x 660 5875 2773 14 x 40.0 356 x 1016
2875 1357 10 x 27.5 254 x 699 6000 2832 14 x 41.0 356 x1041
3000 1416 10 x 28.5 254 x 724 6125 2891 14 x 42.0 356 x 1067
3125 1475 10 x 30.0 254 x 762 6250 2950 14 x 42.5 356 x1080
3250 1534 10 x 31.0 254 x 787 6375 3008 16 x 38.0 406 x 965
3375 1593 10 x 32.0 254 x 813 6500 3067 16 x 39.0 406 x 991

1. If exact exhaust volume is not indicated use duct size closest to required exhaust.

2. Model B water wash hoods and dry extractors have 1.5” W.C. (0.38kPa) for exhaust flow rates
from 90 to 450 CFM/ft (140 to 700 l/s/m)

3. Refer to the REV-LOW Engineering Manual for detailed exhaust air volume calculations.

Spring Air Systems Model No. DN-B-F Hood
Specification

The REV-LOW hood dry extractor shall be a Spring
Air Systems model no. DN-B-F, box canopy, high
efficiency, hood, ULC listed, and built in accordance
with the NFPA-96.

The unit casing shall be a minimum 18 GA. stainless
steel on all exposed surfaces. The ventilator shall have
a full-length inlet slot, a centrifugal vortex chamber, a
vortex and a VARIFLOW baffle. The vortex chamber
shall provide a full 270-degree centrifugal spin around
the vortex baffle. The VARIFLOW baffles are field
adjustable without special tools to provide the
minimum exhaust volume.
Both chambers, the VARIFLOW baffles, the fire
suppression nozzles shall be fully accessible through
removable front grease inserts. The grease inserts shall

Duct Collar Size Exhaust

W x L

in x in

mm x mm

Duct Collar Size

Volume

CFM l/s W x L

in x in

W x L
mm x mm

also be removable without special tools. The grease
trough and cup shall be constructed of

stainless steel. The fire damper shall be activated by a
fusible link and dead weight arrangement.
The hood shall have ______ incandescent/fluorescent
lights evenly spaced along the length of the hood.

Engineering Data

Item Number: ___________________
Model Number: __________________
Number of Sections: __________________
Hood Length: __________________
Hood Width: __________________
Lights: __________________
Exhaust Volume: __________________
No. of Duct Collars: __________________
Size of Duct Collar __________________
Static Pressure: __________________

dnbf

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