Topics:

• Must ductwork run vertical for Wolf Pro Wall Hood ventilation systems?
• Is there a maximum recommended duct run?
• Can elbows and transitions be placed back-to-back?
• Can less than the recommended duct size be used?
• Can flexible metal ducting be used?
• What size ductwork to use for a Wolf blower motor?

Answer:

Note that ductwork should be installed according to the recommendations of an HVAC expert. These resources supplement, and do not replace, the advice of an HVAC expert.

• Ductwork can be routed in any direction from the hood transition.
• A straight, short duct run with limited elbows and transitions will allow the hood or downdraft to work most efficiently.
• Running ductwork down is fine as long as restrictions are adhered to (length, elbows, distance between elbows, etc.).
• Municipality requirements may be more restrictive than Wolf's recommendations; refer to local code for specific information.

• Do not place elbows and transitions back-to-back.
• When possible, include a minimum 15" straight ducting between elbows and transitions.
• 15" of straight ducting is also needed between blower and elbow.
• Elbows and transitions placed too close to each other will cause a decrease in ventilation performance.

• Use recommended duct sizes.
• Depending on the specific ventilation product, Wolf recommends 8" round or 10" round ducting.
• Smaller duct sizes will significantly reduce ventilation performance.
• Use of ducting other than recommended will not void warranty, but may compromise performance.
• Do not use flexible metal ducting.
• Flexible metal ducting will increase air resistance and is not recommended by the National Uniform Mechanical Code Standards.

• Wolf Ventilation Guide
• Product Installation Guide
• Wolf Design Guide
• Ductwork Information for Wolf Ventilation System
• Ventilation Ducting Approvals