MAN - Pyrolytic Oven - REV: Original | D. Installation
14
For the oven to work properly and safely, it must be correctly vented. Standard double walled vent pipe (6 inch I.D.)
should be used. Long runs and runs with excessive elbows should be avoided to minimize friction losses to achieve
the correct draft. In most cases, long runs of flexible vent hose or pipe should not be used as it will often result in
very high friction losses, preventing you from getting an acceptable draft.
However, a small section of flexible six inch duct (6 to 8 inches long) is strongly recommended to allow the Draft
Inducer to be removed and replaced for final adjustment of the draft as seen in Section D.7.
The preferred place for this piece of flexible pipe is between the rigid 6 inch duct pipe and the 6 inch side of the 4 to
6 inch adapter which connects to the top of the Draft inducer. The draft inducer located on top of the oven generates
a negative pressure of about 0.02 to 0.06 inches water column before any vent pipe is added to the exhaust of the
draft inducer. It is extremely important that the final draft achieved on the oven when in operation range from 0.02 to
0.06 inches water column. The final duct pipe and venting arrangement must achieve this result, regardless of the
specifics of how the oven is ducted. Some general guidelines for various possible installations are discussed below.
If There Are Any Questions Regarding Venting Of The Oven, Consult ATS For Recommendations For Your Specific
Location And Circumstances.
For convenience, the system will allow you to turn on the draft inducer and see the current draft. See the “Manual
Screen” section of this manual, but please consult ATS if uncertain how to measure the small negative pressures
required by Pyrolytic Ovens.
Venting to the Outdoors Through Wall or Roof
Standard 6 inch I.D., double walled vent pipe should be used for venting to outdoors for best results. The exhaust
temperature of the gases ranges from 120 to 150 degrees F, so is not much hotter than the exhaust from a clothes
dryer or other low-heat appliance. Elbows can be used, but should be kept to a minimum to prevent excessive
friction losses. Because the Draft Inducer diameter is 4 inch, an adapter to go from 4 to 6 inch duct is necessary.
This adapter is commonly available from most heat/air conditioning supply houses. A non-restricting vent hood or
cap should be used to prevent rain from entering the exhaust pipe.
Regardless of the final physical arrangement of the vent pipe and cap, it should not decrease the draft below 0.02
inch w.c. and should not increase it over 0.06 inch w.c.
If your venting arrangement to the outdoors gives insufficient draft, then means to achieve the proper draft must be
supplied, by an additional powered draft inducer or otherwise. Again, it must be emphasized that if the oven exhaust
pipe is connected to a device capable of pulling a high draft (negative pressure), then the pressure must be adjusted
so it is not too high!
Venting to a Lab Hood or Other Negative Pressure Exhaust System
The Pyro-Clean oven requires a small negative pressure of about 0.04 inches water column to work correctly.
Connection of the vent pipe system of the oven to a lab hood or vent system is recommended and acceptable as
long as the final measured draft of the oven itself is in the proper range of 0.02 to 0.06 inches w.c.
Do not pipe the oven exhaust directly into the duct work itself of a powered exhaust system, as the suction (negative
pressure) may be too strong to permit adjustment to the slight negative pressures required.
Summary of Contents for Pyro-Clean
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