U.S. Stove Ashley AP5770, Owner'S Manual

9

IMPORTANT!  

This unit is equipped with a negative draft system that pulls air through the burn pot and 

pushes the exhaust out of the dwelling. If this unit is connected to a 

fl

 ue system other than the way ex-

plained in this manual, it will not function properly.

MAXIMUM VENTING DISTANCE

Installation MUST include at least 3-feet of vertical pipe outside the home.  This will create some natural draft to reduce the 
possibility of smoke or odor during appliance shutdown and keep exhaust from causing a nuisance or hazard by exposing 
people or shrubs to high temperatures.  The maximum recommend vertical venting height is 12-feet for 3-inch type “PL” 
vent. Total length of horizontal vent must not exceed 4-feet.  This could cause back pressure.  Use no more than 180 
degrees of elbows (two 90-degree elbows, or two 45-degree and one 90-degree elbow, etc.) to maintain adequate draft.

IMPORTANCE OF PROPER DRAFT

Draft is the force which moves air from the appliance up through the chimney. The amount of draft in your chimney 
depends on the length of the chimney, local geography, nearby obstructions and other factors. Too much draft may 
cause excessive temperatures in the appliance. Inadequate draft may cause backpuf

fi

 ng into the room and ‘plugging’ 

of the chimney.
Inadequate draft will cause the appliance to leak smoke into the room through appliance and chimney connector joints.
An uncontrollable burn or excessive temperature indicates excessive draft.
Take into account the chimney’s location to insure it is not too close to neighbors or in a valley which may cause unhealthy 
or nuisance conditions.

PELLET VENT TYPE

A UL listed 3-inch or 4-inch type “PL” pellet vent exhaust system must be used for installation and attached to the pipe 
connector provided on the back of the stove (use a 3-inch to 4-inch adapter for 4-inch pipe).  Connection at back of 
stove must be sealed using Hi-Temp RTV.  Use 4-inch vent if the vent height is over 12-feet or if the installation is over 
2,500 feet above sea level.
We recommend the use of Simpson Dura-Vent® or Metal-Fab® pipe (if you use other pipe, consult your local building 
codes and/or building inspectors).  Do not use Type-B Gas Vent pipe or galvanized pipe with this unit. The pellet vent 
pipe is designed to disassemble for cleaning and should be checked several times during the burning season. Pellet 
vent pipe is not furnished with the unit and must be purchased separately.

PELLET VENT INSTALLATION

The installation must include a clean-out tee to enable collection of 

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 y ash and to permit periodic cleaning of the exhaust 

system.  90-degree elbows accumulate 

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 y ash and soot thereby reducing exhaust 

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 ow and performance of the stove.  

Each elbow or tee reduces draft potential by 30% to 50%.
All joints in the vent system must be fastened by at least 3 screws, and all joints must be sealed with Hi-Temp RTV 
silicone sealant to be airtight.  The area where the vent pipe penetrates to the exterior of the home must be sealed with 
silicone or other means to maintain the vapor barrier between the exterior and the interior of the home.
Vent surfaces can get hot enough to cause burns if touched by children. Noncombustible shielding or guards may be 
required.

PELLET VENT TERMINATION

Do not terminate the vent in an enclosed or semi-enclosed area, such as; carport, garage, attic, crawl space, under 
a sundeck or porch, narrow walkway, or any other location that can build up a concentration of fumes.  Termination in 
one of these areas can also lead to unpredictable pressure situations with the appliance, and could result in improper 
performance and/or malfunction
The termination must exhaust above the outside air inlet elevation.   
The termination must not be located where it will become plugged by snow or other materials.
Do not terminate the venting into an existing steel or masonry chimney.

INSTALLATION

VENTING REQUIREMENTS



Install vent at clearances specified by the vent manufacturer.



Do not connect the pellet vent to a vent serving any other appliance or stove.



Do not install a flue damper in the exhaust venting system of this unit.

The following installation guidelines must be followed to ensure conformity with both the safety listing of this stove and 
to local building codes. Do not use makeshift methods or compromise in the installation.