Baxi 35/80 IE Installation & Servicing Instructions Manual page 32

Fig. 18
4. Taking the air duct, mark dimension 'X' as shown
material, and transfer the dimension to the flue duct
Fig. 19
IMPORTANT: Check all measurements before cutting.
5. Remove the waste from both ducts. Ensure that the cut ends are square and free from
burrs.
(Fig. 19). Measure the length of waste
(Fig. 19).