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Installation of DVF Make-up Air:
1. Use 4 inch diameter flex pipe that is provided in the kit or a comparable single wall metal pipe.
The maximum allowable length of intake pipe is twenty feet not including elbows.
2. Begin installing the 4” tee to the burner (Riello requires the supplied 3” to 4” increaser to be
installed first). Secure all joints on the intake with three screws each.
3. Install the supplied vacuum relief damper in the branch of the tee making sure that it is
mounted with all labeling right side up and perfectly horizontal.
4. In the last run leg of the tee install the aluminum flex pipe.
5. Finally attach the other end of the flex pipe to the intake port on the concentric hood.
6. Inspect the intake system and make sure all connections are secure and then seal each joint
with silicone or aluminum tape.
4.1 DVF-4 Installation of Make-Up Air
Installation of DVF Exhaust:
1. Begin by locating a suitable location for the exhaust to breech the wall. This location should
be at least 12” above ground level or the expected snow level, and on the leeward side of the
house. Consult page 6 for required distances from windows, doors, etc. The hood location
must also allow for a upward slope of a 1/4” per foot for the exhaust piping.
2. Once the hood location has been determined, cut a 8” hole for a non combustible wall, or a
9” hole for a combustible wall. Using 2” X 2”, Frame a box around the hole on the outside of
the house so the flange is mounted away from the siding. Attach the hood to the outside
of the house using appropriate screws to support the hood. Use one screw through each of
the predrilled holes on the trim plate of the hood. Do not drill or screw through the hood at
all.
3. Once the hood is secure, mock up the rest of the vent kit. Start by fitting the boiler adapter
onto the boiler and securing it in place with the locking band on the adapter. Install the rest
of the vent sections that are required to complete your job. Connect the next piece of pipe
by pushing the female end of the pipe over the male end of the boiler adapter. Once the
pipe is fully seated, twist the female end clockwise until the locking mechanism is engaged.
Do not screw into the pipe or add sealant to the pipe as this could compromise the factory
seal. Continue in this way until the entire kit is complete from the boiler to the vent hood. It
is allowable to add extra sections of pipe to the vent kit up to 20 equivalent feet. Each 90
degree elbow is 3 equivalent feet and each 45 degree elbow is 1.5 equivalent feet.
4. Once you are satisfied with the fit of the exhaust, make sure that the vent pipe is properly
supported every three feet with a upward slope to the hood of 1/4” every foot.
4.2 DVF-4 Installation of Exhaust / Termination
