Installation
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
29
Figure 77 - Fan adaptor
FAN ADAPTOR PLATE (FAN) (DIS ONLY)
1. The fan adaptor is designed to connect to an upblast fan mounted
on a roof curb.
2. When connected to an upblast fan (See Figure 77), the plate mounts
on top of the fan curb which supports the fan housing.
3. The plate may be positioned off center within the curb provided that
minimum clearance to combustibles is maintained.
4. In the event that the plate is positioned off center, trim off excess
plate material to allow fan placement.
5. Secure the plate to the curb a minimum of three (3) places per side
with minimum #8 x 1-1/4” wood screws. You will have to drill holes
in the plate.
6. The fan housing is set on top of the plate and sealed using S-650
sealant or an approved gasket supplied by the fan manufacturer.
7. Specify the chimney diameter and outside curb dimensions when
ordering the fan adaptor plate.
8. The fan adaptor plate can be used as a vertical support. The maximum
height of grease duct supported by the fan adaptor plate is 15’ for all
diameters.
WARNING: DO NOT EXCEED THE MAXIMUM LOAD LIMIT OF THE ROOF
CURB OR THE ROOF.
MAINTENANCE
1. Grease duct is required by NFPA 96 and many local building codes
to be inspected and cleaned if necessary at specific intervals.
2. Duravent Model DIS Grease Duct must be inspected and cleaned in
accordance with local requirements. It requires no additional internal
maintenance.
3. Duravent recommends that grease containers connected to drainage
points be emptied and washed out daily or more often, if necessary.
If needed, the drain nipples should be checked and cleaned whenever
the containers are emptied.
4. Where the duct is installed outside the building, the galvalum steel
outer casing must be primed and painted. The paint surface should
be maintained regularly to prevent possible deterioration of the casing
surface. The use of stainless steel outer casing negates the need for
painting.
NOTE: When solid fuel fired cooking appliances are vented with Model
DIS Grease Duct, creosote and grease may buildup on the inner flue.
This mixture can result in an unusually severe duct fire. To minimize fire
hazard, the duct should be inspected weekly and any residue removed by
cleaning. Additional requirements for solid fuel fired cooking appliances
are outlined in NFPA 96.
Upblast fan
Fan adaptor
Screws
(by others)
Sealant
Fan curb