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flexible metal ductwork is equivalent to two feet (617 mm) of straight metal ductwork when calculating the duct run
length.
For best results the size of the ductwork should be uniform and use no more than three 90° elbows. Make sure that
there is a minimum of 24" (607 mm) of straight duct between elbows if more than one is used. Round duct is
recommended instead of rectangular duct especially if elbows are needed. Rectangular duct should be transitioned to
minimum 6" (152 mm) round for internal blowers and 10" (254 mm) round for remote blowers as soon as possible.
EQUIVALENT LENGTH
5 feet (1.5 m)
45° elbow
7 feet (2.1 m)
90° elbow
90° flat elbow
12 feet (3.7 m)
Wall cap
0 feet (0.0 m)
• This appliance is heavy and requires two persons for unpacking and installation.
• Installation work and electrical wiring must be done by qualified person(s) in accordance with all
• Wear gloves to protect against sharp edges.
• When planning the cutout for the downdraft unit:
• To avoid damage to motor bearings and impellers, keep drywall spray, construction dust, etc.
The manufacturer is not liable for any damage caused by not following these instructions.
1. Preparing for Installation
Before installing your downdraft vent system:
https://producthelp.fisherpaykel.com/us/Cook/Ventilation/Downdraft/HD36/User_Guide_HD36/05_installation_instructions
EXAMPLE CALCULATION
9 feet straight duct
2 x 90° elbows
Wall cap
Complete system
applicable codes and standards.
◦ Draw both the cooktop and downdraft unit cutouts on the countertop before making any
cuts.
◦ Check that there is enough room in the cabinet for both the cooktop and the downdraft unit.
Failure to follow these warnings could result in damage to the countertop.
away from the blower.
9 feet (2.8 m)
14 feet (4.3 m)
0 feet (0.0 m)
23 feet (7.0 m)
Updated: Fri, 28 Jun 2019 03:30:59 GMT
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