Vissani QR254S Manual Del Usario página 8

Pre-Installation (continued)
FOLLOW THESE GUIDELINES WHEN INSTALLING DUCT WORK:
- Your venting system must vent to the outdoors either horizontally through the back wall (13) or vertically through the roof (14)
(refer to Fig . 5/Fig . 6/Fig . 7) .
- Use round metal duct work with a uniform diameter of 7 in (177 mm) . The total duct run in the venting system should not be more
than 35 ft (10 .7 m) .
- Calculate the total effective length of the duct work by adding the equivalent lengths in the table shown (Fig. 9). For each fitting
used add the length of the equivalent straight duct used in the system .
- Fasten all connections between pieces of duct with sheet metal screws and tape all joints with certified duct tape.
- If you must turn the path of the duct work using elbows, keep the number of elbows to a minimum for effective performance and
use no more than three 90° elbows . Ensure that there is a minimum of 18 in (458 mm) of straight vent between each elbow . Elbow
as far away from the range hood's exhaust opening as possible .
- Cap the exterior of the duct with a wall cap (15) or roof cap (16). Never use 4 in (102 mm) laundry-type wall caps. Use caulking to
seal exterior wall or roof opening around the cap .
- The venting system must have a damper . If the roof or wall cap has a damper, do not use the damper supplied with the range hood .
Horizontal Wall Venting
Fig .5
For interior venting system (air does not exhaust to outdoors) (Fig . 8):
In interior vented installations, air is recirculated through a charcoal filter and exhausted through the top of the range hood (17). See
installation section for more details .
17
QR254S
Horizontal Wall Venting
15
13
Fig .6
Fig . 8
15
13
Equivalent Length Chart
Type of duct
45° Elbow
90° Elbow
90° Flat elbow
9 ft (2 .74 m) Straight duct
Wall cap
8
Vertical Roof Venting
16
14
Fig .7
Length added
3 ft (0 .91 m)
5 ft (1 .52 m)
12 ft (3 .66 m)
9 ft (2 .74 m)
0 ft (0 m)
Fig . 9