Piazzetta P960 Instructions For Installation, Use And Maintenance Manual page 8

Where 4" diameter pipe must be used, connect it to the stove flue outlet
with a 3" union-tee then use a 3" – 4" adaptor (Fig. 8).
Union-tee
The use of this type of fitting must allow for the collection of condensate
mixed with soot, which builds up inside the pipe.
It must also permit periodic cleaning of the flue without the need to
disassemble the pipes.
Single or double clean-out tees may be used.
An example is given below of a flueway connection, which allows
complete cleaning without having to disassemble the pipes (Fig. 9).
8
Fig. 8
Fig. 9
DIRECTION
OF CLEANING
H MIN 5'
H07028100/DT2000970 – 01
PELLET
STOVE
INSULATING
MATERIAL
SEE VENT MANUFACTURER'S
INSTRUCTIONS
TEE
0 ÷ 10'
MIN 3%
DIRECTION
OF CLEANING
PELLET
STOVE
TEE
DIRECTION
OF CLEANING
Ø 4"
Ø 3"
TEE W/TEE CAP
DT2033009-00
TEE
H MIN 13'
DT2033008-01