Viking VEV900 User Manual

2

1. Locate the blower on the rear slope of the roof.

Place it in a location to minimize duct run. The
location should be free of obstacles (T.V. leads,
electrical lines, etc.). Bear in mind, if the blower top
is level with the roof peak, it will not be seen from
the street. Keep this approximate location in mind
as you work from within the attic.

1. Choose a position on the outside wall. Make sure

that no wall studs, pipes or wires run through the
opening area.

5. For flat roof installations, build a curb that will mount

the blower at a minimum pitch of 2/12. See Figure
2. Discharge end of the blower should be pointed
away from prevailing winds.

From inside the attic space:
2.

Drill a PILOT HOLE up through the roof, 8½"
from the 

inside edge

 of a ROOF RAFTER.

From outside - on the roof:
3.

Measure and mark the 20¾" x 20½" rectangle.
Cut and remove only the shingles inside this
rectangle.

4.

Measure and mark the 11" DIAMETER HOLE
and the 1¼" DIAMETER HOLE. Cut these holes
all the way through the roof.

1. Unpack the blower assembly.

2. Remove the cover and screws.

3. Remove and discard cardboard from blower wheel.

4. Remove the wiring box cover and screws.

5. Attach an appropriate U.L. approved cable con-

nector in the hole at the rear of the wiring box.

From inside the wall:
2.

Drill a PILOT HOLE through the wall, 8½" from
the 

inside edge

 of a WALL STUD.

From outside - on the wall:
3.

Measure and mark the 25" x 29½" rectangle. Cut
and remove only the siding inside this rectangle.

4.

Measure and mark the 11" DIAMETER HOLE
and  the 1¼" DIAMETER HOLE. Cut these holes
all the way through the wall.