Hood Exhaust; Equivalent Length - Danby DOM014401G1 Installation Manual

INSTALLATION INSTRUCTIONS

HOOD EXHAUST

This microwave is designed for adaptation to three types of ventilation: outside top exhaust, outside back
exhaust and non-venting ductless recirculation. Use the following duct instructions if the appliance will be
vented to the outside.
For satisfactory air movement, the total duct length of 3 1/4" x 10" rectangular or 6" round duct should
not exceed 140 equivalent feet.
Elbows, transitions, wall caps and roof caps present additional resistance to airfl ow and are equivalent
to a section of straight duct which is longer than the actual physical size. When calculating the total duct
length add the equivalent lengths of all transitions and adapters plus the length of all straight duct sections.
The chart below is an example of one possible installation confi guration.
OUTSIDE TOP EXHAUST (EXAMPLE ONLY)
The following chart describes an example of one possible ductwork installation.
DUCT PIECES
IMPORTANT: If a rectangular to round transition adapter is used, the bottom corners of the damper must
be cut to fi t using tin snips to allow free movement of the damper.
IMPORTANT: It is important that venting be installed using the most direct route with as few elbows as
possible. This ensures clear venting of exhaust and helps prevent blockages. Make sure dampers swing
freely and nothing is blocking the ducts.
EQUIVALENT
LENGTH
Roof cap
24 ft
12 ft. straight
duct (6" 12 ft
round)
Rectangular to
round transi- 5 ft
tion adapter
X NUMBER = EQUIVALENT
USED
X (1) = 24 ft
X (1) = 12 ft
X (1) = 5 ft
TOTAL LENGTH = 41 ft
9
LENGTH