Proheat A4 - Manual (Page 15)

DIRECTION OF
VEHICLE TRAVEL
PROHEAT AIR A2/A4 INSTALLATION MANUAL 2-5
Figure 9. Air Intake Silencer. Figure 8. Air Intake Silencer Extension.
NUT (4)
SILICON GASKET FLANGE
HEX. HEAD #12
SELF TAPPING
SCREW x 1.5" (4)
SPRING WASHER (4) CAB FLOOR
FOAM
GASKET
OPTIONAL
MOUNTING
PLATE
Figure 7. Optional Mounting Plate.
COMBUSTION AIR INTAKE
SILENCER
The air intake silencer acts as an air flow stabilizer for the heater. Operation
of the heater without the silencer is not recommended.
1. Using the supplied 16-25 hose clip, attach the air intake to the heater
combustion air intake and secure.
2. Route the silencer in the opposite direction of the vehicle motion pointing
down slightly (refer to figure 9).
A4 heaters only: Secure the air intake silencer to the underside of the vehicle.
3. For extra thick floors or additional insulation (A2 heaters only), cut a 2"
(50 mm) length of 5/8" (15mm) inside diameter heater hose and attach
to the heater combustion air intake with a hose clamp (refer to figure 8).
4. Insert the air intake silencer to the free end of the heater hose and
secure with a hose clamp ensuring the silencer points in the opposite
direction of vehicle travel and pointing down slightly (refer to figure 9).
2.5
CAUTION
Combustion air intake must draw
air from the outside of the vehicle
to prevent risk of suffocation.
Maintain adequate distance between
combustion air intake and exhaust
outlet to prevent exhaust gases
from entering the heater.
CLAMP
CLAMP
DIRECTION
OF VEHICLE
TRAVEL
HOSE