PBU 21KBCAT Operator's Manual page 6

A-6 / ENGLISH
Notice the CO concentration and the Effective Operating Zone with air exchange. The CO cloud is still concentrated in a small area. Note the
"Dividing Zone" shown above, this is the line where airfl ow changes direction. In Model 2, air changes are cut in ½ as little or no CO crosses the
Dividing Zone to be exhausted.
Notice the CO concentration and the Effective Operating Zone (Expanded to the Dividing zone) with air exchange and forced air mixing. The CO
cloud is still concentrated on one side of the Dividing zone. Note the "Dividing Zone" shown above, this is the line where airfl ow changes direction.
In Model 3, air changes are cut in ½ as little or no CO crosses the Dividing Zone to be exhausted.
Notice the CO concentration and the Effective Operating Zone (Expanded through the Dividing zone to the second vent) with air exchange and
forced air mixing through the dividing Zone. The CO cloud is diluted with the available air in the building. Note the "Dividing Zone" shown above,
this is the line where airfl ow changes direction. In Model 4, air changes are full as forced air mixing has moved and mixed the CO between all air
zones.
A-6 - FORM NO. 56091022 - PBU Propane Burnisher