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C. RECIRCULATING (NON-VENTED DUCTLESS)
See page 41
Models are shipped for recirculating exhaust. Some models have a disposable charcoal
filter installed to help remove smoke and odors.
NOTE:
Read the next two pages only if you plan to vent your exhaust to the outside. If you plan
to recirculate the air back into the room, proceed to page 23-26.
Installation Instructions For External Exhaust Ducting
NOTE:
If you need to install ducts, note that the total duct length of 3
1
⁄
4
" x 10" (8.2 x 25.4 cm)
rectangular or 5" (12.7 cm)diameter/ 6" ” (15.2 cm) diameter round duct should not
exceed 120 equivalent feet (36.5 m).
Outside ventilation requires an EXTERNAL EXHAUST DUCT.Read the following carefully.
NOTE:
It is important that venting be installed using the most direct route and with as few
elbows as possible. This ensures clear venting of exhaust and helps prevent blockages.
Also, make sure dampers swing freely and nothing is blocking the ducts.
Exhaust connection:
The exhaust adaptor has been designed to mate with a standard 3
1
⁄
4
" x 10” (8.2 x 25.4
cm) rectangular duct.
If a round duct is required, a rectangular-to-round transition adaptor must be used.
A5 " (12.7cm)/ 6" (15.2cm) diameter duct is acceptable to use.
Maximum duct length:
For satisfactory air movement, the total duct length of 3
1
⁄
4
" x 10" (8.2 x 25.4 cm)
rectangular or 5" (12.7 cm) diameter/ 6 "(15.2 cm) diameter round duct should not
exceed 120 equivalent feet (36.5 m).
Elbows, transitions, wall and roof caps, etc., present additional resistance to airflow and
are equivalent to a section of straight duct which is longer than their actual physical size.
When calculating the total duct length, add the equivalent lengths of all transitions and
adaptors plus the length of all straight duct sections. The chart below shows you how
EN-23
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