PLANNING
GUIDE
All specications subject to change without notice. www.dacor.com Ph. 800.793.0093
Heritage®30”, 36", 48” Wide
Wall-Mount Range Hood
Page 4 of 4
All tolerances: ±¹/₁₆” (±1.6 mm) unless otherwise stated.
HWHP, HWHE
Planning the Ductwork
WARNING
• To improve efficiency and keep annoying/lethal smoke, odor, and
chemical vapor out of the home:
– follow the manufacturer’s directions for these devices and NFPA/
ASHRAE recommendations.
– install a remote blower and proper ductwork
– tape all duct joints securely.
• Do NOT add an in-line or external blower to lengthen the duct. Even
small differences in blower air-flow rates can greatly hinder the
hood’s ability to draw air.
CAUTION
To reduce risk of fire and to properly exhaust air, duct air to the out-
doors, not into walls, ceilings, attics, crawlspaces, or garages.
WARNING
In installing ducting, ensure the hood’s damper flaps can open freely.
• Local building codes may require use of makeup air systems
with ventilation systems that move air at greater than the
specified rate (CFM). Specified rates depend on locale. When
designing the system, consult a qualified HVAC specialist about
local requirements and to ensure optimal performance.
• The owner is financially responsible for all ducting (incl. screws
and foil tape).
• Ducting must not interfere with floor joists or wall studs.
• On dual-exhaust hoods, the two 8” exhausts may be merged
into one 10” duct using Dacor transition kit AHT10. See the hood
Installation Instructions (Pg. 15) for details.
• Fasten all joints with sheet-metal screws, and seal with
certified duct/foil tape.
Venting Options
Typically, the blower vents through the hood top (A); however, the
blower can be turned to vent through the rear (B). When planning
ductwork, always use the shortest, most direct route to the outside.
Calculating Duct Length
Duct type determines the hood’s maximum straight duct length.
Duct Type Maximum Duct Run (feet)
8” Round 60
10” Round
50
3 ” x 10” Rectangular
For each new elbow and transition, you must subtract “equivalent
lengths” from your total maximum duct-run length to compensate
for wind resistance.
Determining Maximum Length
Start with your duct-run’s total maximum length, then subtract all
the ductwork equivalent lengths.
CUTWORK EQUIVALENT LENGTHS
Piece Subtract (feet)
8” 90° elbow 7
8” 45° elbow 3
10” 90° elbow 5
10” 45° elbow 2
3” x 10” to round 90° transition 25
3” x 10” to 8”/10” round transition 4
Wall cap w/damper
*
Roof cap
*These figures vary with model and configuration.
A B
