12
STEP 1 CONSTRUCT CEILING SUPPORT CONTINUED
Installation Instructions
Ductwork
• Use the shortest and straightest duct route possible.
For satisfactory performance, duct run should not
exceed 150 feet equivalent length for any duct
configuration.
• Refer to “Duct Fittings” chart to compute the maximum
permissible length for duct runs to the outdoors.
• This vent hood must use 10” round rigid duct.
• Install the house ductwork to run horizontally between
ceiling joists or straight up through the roof.
Finish the Ceiling
• Finish the ceiling surface. Be sure to mark location of
the ceiling joists and cross framing. Check to be sure
the ceiling is level, use shims if necessary.
Ceiling
Joist
17"
(54" Hood)
12-3/4"
(42" Hood)
2x 4 Min.
Cross Framing
Height
Adjustment
Screw Holes
8-5/8"
Ceiling Joint
2x4
10"
Duct
Vent Straight Up
Through The Ceiling
• Secure each 2 x 4 block with at least four (4), #10 wood
screws, 3” long (not supplied). Use 8 wood screws
total for the two supports.
• The cross framing must be accurately aligned to
assure correct positioning of the hood.
• The cross framing must be level in all directions.
Check with a spirit level and adjust if necessary.
IMPORTANT: The ceiling structure must be capable of
supporting the weight of the hood (approximately 300
pounds) and any inadvertent user contact loads. The
hood support frame will be supported by the 2 x 4
cross framing.