Venting21
In flue pipe | Inside hopper |
| |
In fan | Inside |
chamber | firebox |
& |
|
starter |
|
collar |
|
| Fig.46 |
+= Positive static pressure 
= Negative static pressure
A combustion blower is used to extract the com- bustion gases from the firebox. This causes a negative pressure in the firebox and a positive pressure in the venting system as shown in fig. 46. The longer the vent pipe and more elbows used in the system, the greater the flow resistance.
The recommended maximum flue lengths for the Accentra Insert are as follows:
4" Stainless Steel Flex: 30 Lineal ft. Vertical*
4" PL Vent Pipe:
4" Pl Vent Pipe: 30 Lineal ft. Vertical*
4" Pl Vent Pipe: 14 ft. Vertical
If additional 4" PL Vent fittings are required, the overall length must be reduced by:
Vertical 90o or T: | 2.5' |
Vertical 45o: | 1.5' |
Horizontal 90o or T: 5.0'
Horizontal 45o: | 2.5' |
3" PL Vent Pipe:
20 Lineal ft. vertical*
8 Lineal ft. vertical
If additional 3" PL Vent fittings are required, the overall length must be reduced by:
Vertical 90o or T: | 2.0' |
Vertical 45o: | 1.0' |
Horizontal 90o or T: 4.0'
Horizontal 45o: | 2.0' |
*Long runs of flex or PL vent pipe installed directly vertical from the flue stub may require more frequent cleaning due to fly ash falling off inside and collecting directly above the combustion blower outlet.
Any use of horizontal venting will require more frequent cleaning. It is the responsibility of the installer to makesure all flue configuration are accessible for cleaning.
4" stainless steel flex vent piping is only allowed for use in masonry fireplaces and chimneys or factory built wood burning fireplaces with class A metal chim- neys. All pellet vent pipe whether flex type, PL or an- other approved type must be secured together either by means provided by pipe manufacturer or by 3 screws at each joint.
DO NOT INSTALL A FLUE DAMPER IN THE EXHAUST VENTING SYSTEM OF THIS UNIT.
DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING ANOTHER APPLAINCE.
